Transmission slip after service
Thread Starter
Heel & Toe
Joined: Aug 2006
Posts: 21
Likes: 0
From: Andersonville TENNESSEE
Transmission slip after service
Immediately after the dealership performed the 50K service on my perfectly working transmission (A4, 2002) I have been getting some slippage and I am getting some P1870 codes... How do I check the fluid level, and is there any obvious thing I should check before going back to complain? Thanks.
Tech Contributor
Joined: Oct 1999
Posts: 41,055
Likes: 9,817
From: Charlotte, NC (formerly Endicott, NY)
Since the service was just done it may be they didn't get the tranny full. One of the first things to check in the diagnostic for this code is the tranny fluid level. Here are the diagnostic for P1870 and the way to check the tranny fluid level:
DTC P1870
Circuit Description
The powertrain control module (PCM) monitors the difference between engine speed and transmission output speed. In D3 drive range with the TCC engaged, the engine speed should closely match the transmission output speed. In D4 drive range, with the TCC engaged, the TCC slip speed should be -20 to +50 RPM.
When the PCM detects excessive TCC slip when the TCC should be engaged, then DTC P1870 sets. DTC P1870 is a type B DTC.
Conditions for Running the DTC
No TP sensor DTCs P1120 or P1220.
No VSS assembly DTCs P0502 or P0503.
No TCC solenoid valve DTC P0740.
No 1-2 SS valve DTC P0753.
No 2-3 SS valve DTC P0758.
No 3-2 SS valve assembly DTC P0785.
No TFP manual valve position switch DTC P1810.
No TCC PWM solenoid valve DTC P1860.
No MAF DTCs.
The engine speed is greater than 450 RPM for 5 seconds.
The engine is not in fuel cutoff.
The engine torque is 68-542 N·m (50-400 lb ft).
The engine vacuum is 0-105 kPa (0-15 psi).
The TP angle is 20-99 percent.
The vehicle speed is 48-131 km/h (30-82 mph).
The engine speed is 1,500-3,000 RPM.
The speed ratio is 0.69-0.88, speed ratio is engine speed divided by the transmission output speed.
The gear range is D4.
The commanded gear is not 1st gear.
The TFT is 20-150°C (68-302°F).
The shift solenoid performance diagnostic counters are zero.
Conditions for Setting the DTC
DTC P1870 sets if the following conditions occur for three TCC cycles.
The TCC is commanded ON for 5 seconds.
The TCC is at 40 percent duty cycle for 5 seconds.
The TCC slip speed is 130-800 RPM for 7 seconds.
Important
The following actions may occur before the DTC sets.
If the TCC is commanded ON for 5 seconds, the TCC is at 40 percent duty cycle for 5 seconds, the TP angle is 20-99 percent and the transmission slip counter has incremented to either 1 or 2, out of 3 to increment the fail counter for the current ignition cycle, then the following slip conditions and actions may increment the fail counter for the current ignition cycle: These conditions must occur sequentially.
Condition 1
If the TCC slip speed is 130-800 RPM for 7 seconds, then the PCM will command maximum line pressure and freeze shift adapts from being updated.
Condition 2
If Condition 1 is met and the TCC slip speed is 130-800 RPM for 7 seconds, then the PCM will command the TCC Off for 1.5 seconds.
Condition 3
If Condition 2 is met and the TCC slip speed is 130-800 RPM for 7 seconds, then the fail counter on the current ignition cycle is incremented.
The above slip conditions and actions may be disregarded if the TCC is commanded OFF at any time as a result of a driving maneuver, sudden acceleration or deceleration.
Action Taken When the DTC Sets
The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
The PCM commands maximum line pressure.
The PCM inhibits TCC engagement.
The PCM inhibits 4th gear if the transmission is in hot mode.
The PCM freezes transmission adapt functions.
The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.
The PCM stores DTC P1870 in PCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.
Conditions for Clearing the MIL/DTC
The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
A scan tool can clear the MIL/DTC.
The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM.
Diagnostic Aids
Bronze material found in the transmission oil pan may indicate stator shaft bushing wear. If bushing wear is suspected, inspect the stator shaft and the input, turbine, shaft for damage.
Refer to Symptoms - Automatic Transmission for more information.
Test Description
The number below refers to the step number on the diagnostic table.
3. This step tests the torque converter for slippage while in a commanded lock-up state.
DTC P1870 Step
Action
Value(s)
Yes
No
1
Did you perform the Powertrain Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check - Engine Controls in Engine Controls
2
Inspect for correct transmission fluid level.
Refer to Transmission Fluid Checking Procedure .
Did you perform the fluid checking procedure?
--
Go to Step 3
Go to Transmission Fluid Checking Procedure
3
Install a scan tool.
Turn ON the ignition, with the engine OFF.
Important
Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM.
Record the DTC Freeze Frame and Failure Records.
Clear the DTC.
Important
It may be necessary to allow multiple TCC cycles to occur in order to verify a slipping condition. It may also be necessary to ensure the transmission is warm before performing this step.
Drive the vehicle in 4th gear with the TCC commanded ON.
Does the scan tool TCC Slip Speed measure within the specified range for 7 seconds?
130-800 RPM
Go to Step 4
Go to Diagnostic Aids
4
Inspect the torque converter clutch (TCC) solenoid valve for the following conditions:
Internal malfunction, such as sediment or damage
Damaged seals
Inspect the torque converter clutch pulse width modulation (TCC PWM) solenoid valve for the following conditions:
Internal malfunction, such as sediment or damage
Damaged seals
Did you find and correct the condition?
--
Go to Step 14
Go to Step 5
5
Inspect the 1-2 shift solenoid (SS) valve for the following conditions:
Internal malfunction, such as sediment or damage
Damaged seals Refer to Shift Solenoid Leak Test .
Inspect the 2-3 shift solenoid (SS) valve for the following conditions:
Internal malfunction, such as sediment or damage
Damaged seals Refer to Shift Solenoid Leak Test .
Inspect the 3-2 shift solenoid valve assembly for the following conditions:
Internal malfunction, such as sediment or damage
Damaged seals Refer to Shift Solenoid Leak Test .
Did you find and correct the condition?
--
Go to Step 14
Go to Step 6
6
Inspect the valve body assembly for a stuck regulator apply valve.
Inspect the valve body assembly for a scored regulator apply valve body. Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Step 7
7
Inspect the torque converter assembly for the following conditions:
Front stator shaft bushing for wear
Stator roller clutch not holding
External damage/leaks
Did you find and correct the condition?
--
Go to Step 13
Go to Step 8
8
Inspect the oil pump assembly for the following conditions:
A stuck converter clutch valve
The converter clutch valve is assembled backwards
A mispositioned converter clutch valve retaining ring
A cocked converter clutch outer valve spring
A mispositioned pump to case gasket
Restricted orifice cup plugs
Damaged orifice cup plugs
Over-tightened, or unevenly tightened pump body to cover bolts
Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Step 9
9
Inspect the input housing and shaft assembly for the following conditions:
Cut turbine shaft O-ring seal
Damaged turbine shaft O-ring seal
Restricted turbine shaft retainer and ball assembly
Damaged turbine shaft retainer and ball assembly
Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Step 10
10
Inspect the 2-4 band assembly for the following conditions:
Worn 2-4 band
Damaged 2-4 band
Mispositioned 2-4 band
Misassembled 2-4 band
The band anchor pin is not engaged
Restricted apply passages in the 2-4 servo assembly
Blocked apply passages in the 2-4 servo assembly
Nicks or burrs on the servo pin
Nicks or burrs on the pin bore in the case
Damaged fourth servo piston
Misassembled fourth servo piston
Damaged band apply pin
Incorrect band apply pin
Damaged servo bore in the case
Missing piston seals
Cut piston seals
Damaged piston seals
Porosity in the pistons
Porosity in the cover
Porosity in the case
Damaged piston seal grooves
Plugged orifice cup plug
Missing orifice cup plug
Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Step 11
11
Inspect the forward clutch assembly for the following conditions:
Worn clutch plates
Porosity in the forward clutch piston
Damaged forward clutch piston
Missing forward clutch piston inner and outer seals
Cut forward clutch piston inner and outer seals
Damaged forward clutch piston inner and outer seals
Missing input housing to forward clutch housing O-ring seal
Cut input housing to forward clutch housing O-ring seal
Damaged input housing to forward clutch housing O-ring seal
Damaged forward clutch housing
Damaged forward clutch housing retainer and ball assembly
Forward clutch housing retainer and ball assembly is not sealing
Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Step 12
12
Inspect the 3-4 clutch assembly for the following conditions:
Worn clutch plates
Porosity in the 3-4 clutch piston
Damaged 3-4 clutch piston
Missing 3-4 clutch inner and outer seals
Cut 3-4 clutch inner and outer seals
Damaged 3-4 clutch inner and outer seals
Damaged 3-4 clutch spring assembly
Damaged 3-4 clutch apply ring
Damaged piston seal grooves
Plugged orifice cup plug
Missing orifice cup plug
Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Intermittent Conditions in Engine Controls
13
Change the AT fluid and filter.
Inspect for correct transmission fluid level. Refer to Transmission Fluid Checking Procedure .
Add new AT fluid as necessary.
Important
The Clear TAPS function will clear all adapt cells. This may affect transmission performance. The PCM will update the transmission adapt cell values as the vehicle is driven.
Using the scan tool, perform the Clear TAPS function.
Did you complete the above procedure?
--
Go to Step 14
--
14
Perform the following procedure in order to verify the repair:
Select DTC.
Select Clear Info.
Operate the vehicle under the following conditions:
Drive the vehicle in D4, with the TCC ON, and a throttle position at 20%.
Ensure that the scan tool TCC Slip Speed is -20 to +50 RPM for at least 7 seconds.
Select Specific DTC.
Enter DTC P1870.
Has the test run and passed?
--
System OK
Go to Step 1
Transmission Fluid Checking Procedure
Step
Action
Value(s)
Yes
No
1
Start the engine and allow the engine to idle until the transmission fluid temperature has reached the value specified.
Depress the brake pedal and move the shift lever through the gear ranges, pausing a few seconds in each range. Return the shift lever to the PARK range.
Raise the vehicle on a hoist. The vehicle must be level with the engine running and the shift lever in the PARK range. Refer to Lifting and Jacking the Vehicle in General Information.
Caution
The engine must be running when the transmission fluid fill plug is removed, or excessive fluid loss will occur. Transmission fluid may be hot. Since the actual fluid level is unknown, stand clear when removing the fill plug. Have a container ready to capture any lost fluid. Do not turn the engine off with the fill plug removed, as you can be injured by hot transmission fluid being expelled out of the oil fill opening.
Remove the transmission plug.
Important
The transmission fluid may darken with normal use and does not always indicate contamination or oxidation.
Check the fluid color. If necessary, use a small screwdriver as a dipstick.
Is the fluid color clear red or light brown with no burnt odor?
30-50°C
(86-122°F)
Go to Step 4
Go to Step 2
2
Does the fluid have a burnt odor or a dark brown color?
--
Go to Step 8
Go to Step 3
3
Does the fluid have a cloudy or milky appearance?
--
Go to Step 7
Go to Step 8
4
Check the fluid level. The fluid level should be even with the bottom of the threaded plug hole.
Is the fluid level low?
--
Go to Step 5
Go to Step 11
5
Add DEXRON III automatic transmission fluid in increments of 0.5 L until the fluid drains from the plug hole.
Did you add more than 1.5 L to the transmission?
--
Go to Step 6
Go to Step 11
6
The transmission may have a leak. Refer to Fluid Leak Diagnosis .
Was a transmission fluid leak found?
--
Go to Step 9
Go to Step 11
7
The transmission fluid is contaminated with engine coolant. Repair or replace the transmission cooler in the radiator.
Is the transmission cooler repair complete?
--
Go to Step 9
--
8
Drain the fluid by removing the bottom pan.
Important
A very small amount of material in the bottom of the bottom pan is a normal condition.
Check the bottom pan for any excessive debris.
Was excessive debris found?
--
Go to Step 9
Go to Step 10
9
Repair the transmission if required, in some cases, overhaul may be required.
Flush the transmission oil cooler and pipes and check flow. Refer to Automatic Transmission Oil Cooler Flushing and Flow Test .
Add enough DEXRON III automatic transmission fluid to bring the fluid level to the bottom of the threaded plug hole.
Start the engine and allow the engine to idle until the transmission fluid temperature has reached the value specified.
Depress the brake pedal and move the shift lever through the gear ranges, pausing a few seconds in each range. Return the shift lever to the PARK range.
Raise the vehicle on a hoist. The vehicle must be level with the engine running and the shift lever in the PARK range. Refer to Lifting and Jacking the Vehicle in General Information.
Caution
The engine must be running when the transmission fluid fill plug is removed, or excessive fluid loss will occur. Transmission fluid may be hot. Since the actual fluid level is unknown, stand clear when removing the fill plug. Have a container ready to capture any lost fluid. Do not turn the engine off with the fill plug removed, as you can be injured by hot transmission fluid being expelled out of the oil fill opening.
Remove the transmission plug.
If needed, add DEXRON III automatic transmission fluid in increments of 0.5 L until the fluid drains from the threaded plug hole.
Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Allow fluid to finish draining out of the plug hole. Install the plug and tighten to specified value.
Wipe any excess fluid from the transmission with a rag or shop towel.
Is repair complete?
30- 50°C
(86-122°F)
30 N·m
(22 lb ft)
Go to Road Test Procedure
--
10
Change the fluid and the fluid filter. Refer to Automatic Transmission Fluid/Filter Replacement .
Start the engine and allow the engine to idle until the transmission fluid temperature has reached the value specified.
Depress the brake pedal and move the shift lever through the gear ranges, pausing a few seconds in each range. Return the shift lever to the PARK range.
Raise the vehicle on a hoist. The vehicle must be level with the engine running and the shift lever in the PARK range. Refer to Lifting and Jacking the Vehicle in General Information.
Caution
The engine must be running when the transmission fluid fill plug is removed, or excessive fluid loss will occur. Transmission fluid may be hot. Since the actual fluid level is unknown, stand clear when removing the fill plug. Have a container ready to capture any lost fluid. Do not turn the engine off with the fill plug removed, as you can be injured by hot transmission fluid being expelled out of the oil fill opening.
Remove the transmission plug.
If needed, add DEXRON III automatic transmission fluid in increments of 0.5 L until the fluid drains from the threaded plug hole.
Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Allow fluid to finish draining out of the plug hole. Install the plug and tighten to specified value.
Wipe any excess fluid from the transmission with a rag or shop towel.
Is repair complete?
Did you drain the fluid?
30 N·m
(22 lb ft)
Go to Road Test Procedure
--
11
Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Allow fluid to finish draining out of the plug hole. Install the plug and tighten to specified value.
Wipe any excess fluid from the transmission with a rag or shop towel.
Is repair complete?
30 N·m
(22 lb ft)
Go to Road Test Procedure
--
Good Luck with getting the problem solved.
Bill
DTC P1870
Circuit Description
The powertrain control module (PCM) monitors the difference between engine speed and transmission output speed. In D3 drive range with the TCC engaged, the engine speed should closely match the transmission output speed. In D4 drive range, with the TCC engaged, the TCC slip speed should be -20 to +50 RPM.
When the PCM detects excessive TCC slip when the TCC should be engaged, then DTC P1870 sets. DTC P1870 is a type B DTC.
Conditions for Running the DTC
No TP sensor DTCs P1120 or P1220.
No VSS assembly DTCs P0502 or P0503.
No TCC solenoid valve DTC P0740.
No 1-2 SS valve DTC P0753.
No 2-3 SS valve DTC P0758.
No 3-2 SS valve assembly DTC P0785.
No TFP manual valve position switch DTC P1810.
No TCC PWM solenoid valve DTC P1860.
No MAF DTCs.
The engine speed is greater than 450 RPM for 5 seconds.
The engine is not in fuel cutoff.
The engine torque is 68-542 N·m (50-400 lb ft).
The engine vacuum is 0-105 kPa (0-15 psi).
The TP angle is 20-99 percent.
The vehicle speed is 48-131 km/h (30-82 mph).
The engine speed is 1,500-3,000 RPM.
The speed ratio is 0.69-0.88, speed ratio is engine speed divided by the transmission output speed.
The gear range is D4.
The commanded gear is not 1st gear.
The TFT is 20-150°C (68-302°F).
The shift solenoid performance diagnostic counters are zero.
Conditions for Setting the DTC
DTC P1870 sets if the following conditions occur for three TCC cycles.
The TCC is commanded ON for 5 seconds.
The TCC is at 40 percent duty cycle for 5 seconds.
The TCC slip speed is 130-800 RPM for 7 seconds.
Important
The following actions may occur before the DTC sets.
If the TCC is commanded ON for 5 seconds, the TCC is at 40 percent duty cycle for 5 seconds, the TP angle is 20-99 percent and the transmission slip counter has incremented to either 1 or 2, out of 3 to increment the fail counter for the current ignition cycle, then the following slip conditions and actions may increment the fail counter for the current ignition cycle: These conditions must occur sequentially.
Condition 1
If the TCC slip speed is 130-800 RPM for 7 seconds, then the PCM will command maximum line pressure and freeze shift adapts from being updated.
Condition 2
If Condition 1 is met and the TCC slip speed is 130-800 RPM for 7 seconds, then the PCM will command the TCC Off for 1.5 seconds.
Condition 3
If Condition 2 is met and the TCC slip speed is 130-800 RPM for 7 seconds, then the fail counter on the current ignition cycle is incremented.
The above slip conditions and actions may be disregarded if the TCC is commanded OFF at any time as a result of a driving maneuver, sudden acceleration or deceleration.
Action Taken When the DTC Sets
The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
The PCM commands maximum line pressure.
The PCM inhibits TCC engagement.
The PCM inhibits 4th gear if the transmission is in hot mode.
The PCM freezes transmission adapt functions.
The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.
The PCM stores DTC P1870 in PCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.
Conditions for Clearing the MIL/DTC
The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
A scan tool can clear the MIL/DTC.
The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
The PCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the PCM.
Diagnostic Aids
Bronze material found in the transmission oil pan may indicate stator shaft bushing wear. If bushing wear is suspected, inspect the stator shaft and the input, turbine, shaft for damage.
Refer to Symptoms - Automatic Transmission for more information.
Test Description
The number below refers to the step number on the diagnostic table.
3. This step tests the torque converter for slippage while in a commanded lock-up state.
DTC P1870 Step
Action
Value(s)
Yes
No
1
Did you perform the Powertrain Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check - Engine Controls in Engine Controls
2
Inspect for correct transmission fluid level.
Refer to Transmission Fluid Checking Procedure .
Did you perform the fluid checking procedure?
--
Go to Step 3
Go to Transmission Fluid Checking Procedure
3
Install a scan tool.
Turn ON the ignition, with the engine OFF.
Important
Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM.
Record the DTC Freeze Frame and Failure Records.
Clear the DTC.
Important
It may be necessary to allow multiple TCC cycles to occur in order to verify a slipping condition. It may also be necessary to ensure the transmission is warm before performing this step.
Drive the vehicle in 4th gear with the TCC commanded ON.
Does the scan tool TCC Slip Speed measure within the specified range for 7 seconds?
130-800 RPM
Go to Step 4
Go to Diagnostic Aids
4
Inspect the torque converter clutch (TCC) solenoid valve for the following conditions:
Internal malfunction, such as sediment or damage
Damaged seals
Inspect the torque converter clutch pulse width modulation (TCC PWM) solenoid valve for the following conditions:
Internal malfunction, such as sediment or damage
Damaged seals
Did you find and correct the condition?
--
Go to Step 14
Go to Step 5
5
Inspect the 1-2 shift solenoid (SS) valve for the following conditions:
Internal malfunction, such as sediment or damage
Damaged seals Refer to Shift Solenoid Leak Test .
Inspect the 2-3 shift solenoid (SS) valve for the following conditions:
Internal malfunction, such as sediment or damage
Damaged seals Refer to Shift Solenoid Leak Test .
Inspect the 3-2 shift solenoid valve assembly for the following conditions:
Internal malfunction, such as sediment or damage
Damaged seals Refer to Shift Solenoid Leak Test .
Did you find and correct the condition?
--
Go to Step 14
Go to Step 6
6
Inspect the valve body assembly for a stuck regulator apply valve.
Inspect the valve body assembly for a scored regulator apply valve body. Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Step 7
7
Inspect the torque converter assembly for the following conditions:
Front stator shaft bushing for wear
Stator roller clutch not holding
External damage/leaks
Did you find and correct the condition?
--
Go to Step 13
Go to Step 8
8
Inspect the oil pump assembly for the following conditions:
A stuck converter clutch valve
The converter clutch valve is assembled backwards
A mispositioned converter clutch valve retaining ring
A cocked converter clutch outer valve spring
A mispositioned pump to case gasket
Restricted orifice cup plugs
Damaged orifice cup plugs
Over-tightened, or unevenly tightened pump body to cover bolts
Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Step 9
9
Inspect the input housing and shaft assembly for the following conditions:
Cut turbine shaft O-ring seal
Damaged turbine shaft O-ring seal
Restricted turbine shaft retainer and ball assembly
Damaged turbine shaft retainer and ball assembly
Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Step 10
10
Inspect the 2-4 band assembly for the following conditions:
Worn 2-4 band
Damaged 2-4 band
Mispositioned 2-4 band
Misassembled 2-4 band
The band anchor pin is not engaged
Restricted apply passages in the 2-4 servo assembly
Blocked apply passages in the 2-4 servo assembly
Nicks or burrs on the servo pin
Nicks or burrs on the pin bore in the case
Damaged fourth servo piston
Misassembled fourth servo piston
Damaged band apply pin
Incorrect band apply pin
Damaged servo bore in the case
Missing piston seals
Cut piston seals
Damaged piston seals
Porosity in the pistons
Porosity in the cover
Porosity in the case
Damaged piston seal grooves
Plugged orifice cup plug
Missing orifice cup plug
Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Step 11
11
Inspect the forward clutch assembly for the following conditions:
Worn clutch plates
Porosity in the forward clutch piston
Damaged forward clutch piston
Missing forward clutch piston inner and outer seals
Cut forward clutch piston inner and outer seals
Damaged forward clutch piston inner and outer seals
Missing input housing to forward clutch housing O-ring seal
Cut input housing to forward clutch housing O-ring seal
Damaged input housing to forward clutch housing O-ring seal
Damaged forward clutch housing
Damaged forward clutch housing retainer and ball assembly
Forward clutch housing retainer and ball assembly is not sealing
Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Step 12
12
Inspect the 3-4 clutch assembly for the following conditions:
Worn clutch plates
Porosity in the 3-4 clutch piston
Damaged 3-4 clutch piston
Missing 3-4 clutch inner and outer seals
Cut 3-4 clutch inner and outer seals
Damaged 3-4 clutch inner and outer seals
Damaged 3-4 clutch spring assembly
Damaged 3-4 clutch apply ring
Damaged piston seal grooves
Plugged orifice cup plug
Missing orifice cup plug
Refer to Transmission Overhaul Procedure in the 4L60-E section of the Transmission Unit Repair Manual.
Did you find and correct the condition?
--
Go to Step 13
Go to Intermittent Conditions in Engine Controls
13
Change the AT fluid and filter.
Inspect for correct transmission fluid level. Refer to Transmission Fluid Checking Procedure .
Add new AT fluid as necessary.
Important
The Clear TAPS function will clear all adapt cells. This may affect transmission performance. The PCM will update the transmission adapt cell values as the vehicle is driven.
Using the scan tool, perform the Clear TAPS function.
Did you complete the above procedure?
--
Go to Step 14
--
14
Perform the following procedure in order to verify the repair:
Select DTC.
Select Clear Info.
Operate the vehicle under the following conditions:
Drive the vehicle in D4, with the TCC ON, and a throttle position at 20%.
Ensure that the scan tool TCC Slip Speed is -20 to +50 RPM for at least 7 seconds.
Select Specific DTC.
Enter DTC P1870.
Has the test run and passed?
--
System OK
Go to Step 1
Transmission Fluid Checking Procedure
Step
Action
Value(s)
Yes
No
1
Start the engine and allow the engine to idle until the transmission fluid temperature has reached the value specified.
Depress the brake pedal and move the shift lever through the gear ranges, pausing a few seconds in each range. Return the shift lever to the PARK range.
Raise the vehicle on a hoist. The vehicle must be level with the engine running and the shift lever in the PARK range. Refer to Lifting and Jacking the Vehicle in General Information.
Caution
The engine must be running when the transmission fluid fill plug is removed, or excessive fluid loss will occur. Transmission fluid may be hot. Since the actual fluid level is unknown, stand clear when removing the fill plug. Have a container ready to capture any lost fluid. Do not turn the engine off with the fill plug removed, as you can be injured by hot transmission fluid being expelled out of the oil fill opening.
Remove the transmission plug.
Important
The transmission fluid may darken with normal use and does not always indicate contamination or oxidation.
Check the fluid color. If necessary, use a small screwdriver as a dipstick.
Is the fluid color clear red or light brown with no burnt odor?
30-50°C
(86-122°F)
Go to Step 4
Go to Step 2
2
Does the fluid have a burnt odor or a dark brown color?
--
Go to Step 8
Go to Step 3
3
Does the fluid have a cloudy or milky appearance?
--
Go to Step 7
Go to Step 8
4
Check the fluid level. The fluid level should be even with the bottom of the threaded plug hole.
Is the fluid level low?
--
Go to Step 5
Go to Step 11
5
Add DEXRON III automatic transmission fluid in increments of 0.5 L until the fluid drains from the plug hole.
Did you add more than 1.5 L to the transmission?
--
Go to Step 6
Go to Step 11
6
The transmission may have a leak. Refer to Fluid Leak Diagnosis .
Was a transmission fluid leak found?
--
Go to Step 9
Go to Step 11
7
The transmission fluid is contaminated with engine coolant. Repair or replace the transmission cooler in the radiator.
Is the transmission cooler repair complete?
--
Go to Step 9
--
8
Drain the fluid by removing the bottom pan.
Important
A very small amount of material in the bottom of the bottom pan is a normal condition.
Check the bottom pan for any excessive debris.
Was excessive debris found?
--
Go to Step 9
Go to Step 10
9
Repair the transmission if required, in some cases, overhaul may be required.
Flush the transmission oil cooler and pipes and check flow. Refer to Automatic Transmission Oil Cooler Flushing and Flow Test .
Add enough DEXRON III automatic transmission fluid to bring the fluid level to the bottom of the threaded plug hole.
Start the engine and allow the engine to idle until the transmission fluid temperature has reached the value specified.
Depress the brake pedal and move the shift lever through the gear ranges, pausing a few seconds in each range. Return the shift lever to the PARK range.
Raise the vehicle on a hoist. The vehicle must be level with the engine running and the shift lever in the PARK range. Refer to Lifting and Jacking the Vehicle in General Information.
Caution
The engine must be running when the transmission fluid fill plug is removed, or excessive fluid loss will occur. Transmission fluid may be hot. Since the actual fluid level is unknown, stand clear when removing the fill plug. Have a container ready to capture any lost fluid. Do not turn the engine off with the fill plug removed, as you can be injured by hot transmission fluid being expelled out of the oil fill opening.
Remove the transmission plug.
If needed, add DEXRON III automatic transmission fluid in increments of 0.5 L until the fluid drains from the threaded plug hole.
Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Allow fluid to finish draining out of the plug hole. Install the plug and tighten to specified value.
Wipe any excess fluid from the transmission with a rag or shop towel.
Is repair complete?
30- 50°C
(86-122°F)
30 N·m
(22 lb ft)
Go to Road Test Procedure
--
10
Change the fluid and the fluid filter. Refer to Automatic Transmission Fluid/Filter Replacement .
Start the engine and allow the engine to idle until the transmission fluid temperature has reached the value specified.
Depress the brake pedal and move the shift lever through the gear ranges, pausing a few seconds in each range. Return the shift lever to the PARK range.
Raise the vehicle on a hoist. The vehicle must be level with the engine running and the shift lever in the PARK range. Refer to Lifting and Jacking the Vehicle in General Information.
Caution
The engine must be running when the transmission fluid fill plug is removed, or excessive fluid loss will occur. Transmission fluid may be hot. Since the actual fluid level is unknown, stand clear when removing the fill plug. Have a container ready to capture any lost fluid. Do not turn the engine off with the fill plug removed, as you can be injured by hot transmission fluid being expelled out of the oil fill opening.
Remove the transmission plug.
If needed, add DEXRON III automatic transmission fluid in increments of 0.5 L until the fluid drains from the threaded plug hole.
Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Allow fluid to finish draining out of the plug hole. Install the plug and tighten to specified value.
Wipe any excess fluid from the transmission with a rag or shop towel.
Is repair complete?
Did you drain the fluid?
30 N·m
(22 lb ft)
Go to Road Test Procedure
--
11
Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Allow fluid to finish draining out of the plug hole. Install the plug and tighten to specified value.
Wipe any excess fluid from the transmission with a rag or shop towel.
Is repair complete?
30 N·m
(22 lb ft)
Go to Road Test Procedure
--
Good Luck with getting the problem solved.
Bill
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
A4 tranny fluid level must be checked with the engine running. Too many don't know/forget to do this. If you check/fill with the engine not running; you'll ba a couple of quarts low.
