ChevyDave

Service Active Handling (SAH) info obtained from forum members , thanks everyone!!!!

When you have the message SAH, the car's active handling has been turned off. I explained to the wife that the car will NOT try to save you if you fishtail/slide/skid and its now totally up to you to save yourself.

overview......................
There is a lot of confusion on the sequence of events when Active Handling activates. There are three things we do know.

1.) When the Service Message is displayed the EBCM has already turned off Active Handling and as long as that message is displayed Active Handling is not functional.

2.) When the message is not displayed Active Handling is functional. Even if you turn it off with the push button it is still functioning in a suspended state just waiting for you to push the switch or for the car to override your selection due to a tire pressure issue.

3.) The EBCM resets with each ignition cycle so intermittent failures and the messages they cause will disappear each time you start the engine. If you have a hard failure the EBCM will display a message as soon as the engine starts or as soon as the internal self test is completed which occurs before the car gets to 10 mph.

There is nothing to say your problem is a safety related issue. The steering sensor can go bad and when the EBCM sees the wrong data from the sensor it turns active handling off.

The safety issue probably comes when the sensor or connector is close to failing the internal test and the EBCM sees spurious signals, which although incorrect, are not out of range and thus it generates an active handling intervention when it shouldn't happen.

On some cars as the intervention occurs the EBCM detects an issue thus throwing a code that turns off Active Handling and displays the Service Message. What the driver experiences is a sudden pull on the steering, which is released at some point followed by the Service Active Handling message. This can occur quite fast and I suspect that since the driver is looking down the road and not at the DIC when the intervention occurs they think the message caused the intervention when it is the other way around. On other cars there will be no Service Message just the pulling of the steering wheel until the marginal condition disappears. I have a couple of nice videos showing that happening to my car on an autocross course. The in car video shows the steering wheel being yanked from my hands and then turning back and forth while the outside video shows what was happening with the car. I also had a passenger in the car who witnessed the whole thing. I had turned Active Handling off and at no time did the DIC show a Service Message. By the way my car has the clip in the connector and the connector isn't loose.

It is only when the DIC has no message there is a potential safety issue. While the Service Message is being displayed you are not in danger as the system will not reset until the next ignition cycle. If you have a solid Service Message when you start the car you don't have a safety issue.

If you are worried about the problem all you have to do is pull the ABS fuses thus killing the EBCM so it can't do a single thing. Of course you won't have ABS and the ABS and TC lights on the IP will be lit.

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Before you blindly go replacing things you should make sure what is wrong. Just because you see a Service Active Handling message doesn't mean anything other than you need to get it serviced. It does not point to any specific failure and there is definitely more than one failure that can cause that message to be displayed. Also when that message is displayed the Active Handling System is not operational (meaning it is turned off by the EBCM).

SAH can be caused by numerous reasons. Code(s) must be read in order to determine the cause. ABS codes (C codes listed) can be read by a TechII which also can read the associated subcodes. Some parts stores can read your ABS codes and some cannot. Note that codes must be read when SAH message is present when you turn off the car, because if you start the car and the problem isnt present, the codes wont be present either.

List of items that cause the error are.....
Wheel Speed Sensor(s)
Brake Pedal Position Sensor
Brake Fluid Pressure Sensor
Steering Wheel Position Sensor
Yaw Rate Sensor
Lateral Accelerameter Sensor
"erratic signaling" in the BCM requiring it's replacement
or... bad contacts/connectors/wiring for one of the above

I had P0106, map sensor error, which appears to cause SAH for me.
Another had MAF sensor error causing SAH.

(guessing the cause of the error isnt reasonable, you gotta get codes read!!)

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Following are SOME C codes that could cause SAH. I doubt anyone has a full list of all possible causes!!!!!!

DIC codes listed... C0561 C0137 C0186 C0196 C0252 C0253 C0710


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C0561 means that SAH was set and you need to see what other code(s) caused the actual error condition


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DTC C0137
DTC Descriptor
DTC C0137 11: Base Brake System Pressure Circuit Range Above Maximum
DTC C0137 12: Base Brake System Pressure Circuit Range Below Maximum Threshold
Circuit/System Description
The electronic brake control module (EBCM) uses the input from the brake fluid pressure sensor for more accurate braking control when
the vehicle stability enhancement system (VSES) is active.
Conditions for Running the DTC
• The ignition is ON.
• Ignition voltage is greater than 8 volts.
Conditions for Setting the DTC
The brake fluid pressure is less than 345 kPa (50 psi) for 3 deceleration cycles.
Action Taken When the DTC Sets
• The EBCM disables the VSES for the duration of the ignition cycle.
• The traction control off indicator illuminates.
• The driver information center (DIC) displays the SERVICE ACTIVE HANDLING message.
• The antilock brake system (ABS) remains functional.
Conditions for Clearing the DTC
• The condition for the DTC is no longer present.
• The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
• Find out from the driver under what conditions the DTC was set. This information will help to duplicate the failure.
• The Snapshot function on the scan tool can help find an intermittent DTC.
• A deceleration cycle consists of the following sequence:
1. The vehicle speed is greater than 24 km/h (15 mph).
2. The vehicle decelerates more than 8 km/h/second (5 mph/second) for 2 seconds.
3. The vehicle speed decelerates to less than 16 km/h (10 mph).
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the brake fluid pressure sensor.
2. Test for less than 2.0 ohms of resistance between the low reference circuit terminal 1 and ground.
⇒
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the
EBCM.
3. Ignition ON, test for 4.8-5.2 volts between the 5 volt reference circuit terminal 3 and ground.
⇒
If less than the specified range, test the 5 volt reference circuit for a short to ground or an open/high resistance. If the circuit tests
normal, replace the EBCM.
⇒
If greater than the specified range, test the 5 volt reference circuit for a short to voltage. If the circuit tests normal, replace the
EBCM.
4. Verify the scan tool Brake Fluid Pressure Sensor is less than 0.2 volts.
⇒
If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the EBCM.
5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 volt reference circuit terminal 3. Verify the scan
tool Brake Pressure Sensor Input is greater than 4.7 volts.
⇒
If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the EBCM.
6. If all circuits test normal, test or replace the brake fluid pressure sensor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• Control Module References for EBCM replacement, setup, and programming
• Brake Pressure Modulator Valve Pressure Sensor Replacement
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DTC C0186
DTC Descriptor
DTC C0186 00: Lateral Accelerometer Circuit
DTC C0186 08: Lateral Accelerometer Circuit Signal Invalid
DTC C0186 09: Lateral Accelerometer Circuit Rate of Change Above Threshold
DTC C0186 19: Lateral Accelerometer Circuit Signal Amplitude Above Maximum
DTC C0186 1A: Lateral Accelerometer Circuit Bias Level Out Of Range
DTC C0186 52: Lateral Accelerometer Circuit Compare Failure
Diagnostic Fault Information
Circuit
Short to
Ground
Open/High
Resistance Short to Voltage Signal Performance
Lateral Accelerometer 5-Volt Reference Circuit C0186 00 C0186 00 C0186 00, C0186 19 --
Lateral Accelerometer Signal Circuit C0186 00 C0186 00 C0186 00, C0186 08, C0186 09,
C0186 19
C0186 1A, C0186 08,
C0186 09, C0186 52
Lateral Accelerometer Low Reference Circuit -- C0186 00 -- --
Circuit/System Description
The electronic brake control module (EBCM) uses the lateral accelerometer signal to determine the lateral forces acting on a vehicle
during a turn or a skid. The EBCM uses the signal from the lateral accelerometer as one of the inputs to operate the vehicle stability
enhancement system (VSES).
Conditions for Running the DTC
C0186 00, 09, and 1A
• The ignition is ON.
• Ignition voltage is greater than 8 volts.
C0186 08
• Ignition voltage is ON.
• Ignition voltage is greater than 8 volts.
• The vehicle speed is greater than 0 km/h (0 mph).
C0186 19
• Ignition voltage is ON.
• Ignition voltage is greater than 8 volts.
• The vehicle is stationary.
C0186 52
• Ignition voltage is ON.
• Ignition voltage is greater than 8 volts.
• DTC C0196 is not set.
• The yaw rate is less than 8 degrees per second.
Conditions for Setting the DTC
C0186 00, 09, and 1A
One of the following conditions exist:
• The lateral accelerometer sensor input voltage is less than 0.15 volt.
• The lateral accelerometer sensor input voltage is greater than 4.85 volts for 0.03 second.
C0186 08
The lateral accelerometer voltage does not increase at least 0.5 volt during the lateral accelerometer sensor self test.
C0186 09
The lateral jerk exceeds 11 g per second twice within 0.2 second.
C0186 19
The lateral acceleration is greater than 0.5 g for more than 1 second.
C0186 1A
Both of the following conditions exist:
• The compensated bias value of the lateral accelerometer sensor is greater than 0.3 g.
• The yaw rate is centered.
C0186 52
The slip rate error exceeds 0.5 g 60 times within one drive cycle.
Action Taken When the DTC Sets
If equipped, the following actions will occur:
• The EBCM disables the VSES for the duration of the ignition cycle.
• The driver information center (DIC) displays the SERVICE ACTIVE HANDLING message.
• The antilock brake system (ABS) and the traction control system (TCS) remain functional.
Conditions for Clearing the DTC
• The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
• The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
The lateral accelerometer is packaged with the yaw rate sensor as a single component.
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the yaw/lat sensor.
2. Test for less than 5 ohms of resistance between the low reference circuit terminal D and ground.
⇒
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests
normal, replace the EBCM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal B and ground.
⇒
If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If
the circuit tests normal, replace the EBCM.
⇒
If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal,
replace the EBCM.
4. Verify the scan tool lateral accelerometer parameter is less than 0 volts.
⇒
If greater than the specified range, test the signal circuit terminal E for a short to voltage. If the circuit tests
normal, replace the EBCM.
5. Install a 3A fused jumper wire between the signal circuit terminal E and the 5-volt reference circuit terminal B. Verify the scan
tool lateral accelerometer is greater than 4.8 volts.
⇒
If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit
tests normal, replace the EBCM.
6. If all circuits test normal, test or replace the yaw/lat sensor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement
• Control Module References for EBCM replacement, setup, and programming
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DTC C0196
DTC Descriptor
DTC C0196 00: Lateral Accelerometer Circuit
DTC C0196 09: Lateral Accelerometer Circuit Rate of Change Fault
DTC C0196 1A: Lateral Accelerometer Circuit Bias Level Out Of Range
DTC C0196 52: Lateral Accelerometer Circuit Compare Failure
Diagnostic Fault Information
Circuit
Short to
Ground
Open/High
Resistance Short to Voltage Signal Performance
Lateral Accelerometer 5-Volt Reference Circuit C0196 00 C0196 00 C0196 00 --
Lateral Accelerometer Signal Circuit C0196 00 C0196 00 C0196 00 C0196 1A, C0196 09, C0196 52
Lateral Accelerometer Low Reference Circuit -- C0196 00 -- --
Circuit/System Description
The vehicle stability enhancement system (VSES) is activated by the electronic brake control module (EBCM) calculating the desired
yaw rate and comparing it to the actual yaw rate input. The desired yaw rate is calculated from measured steering wheel position, vehicle
speed, and lateral acceleration. The difference between the desired yaw rate and actual yaw rate is the yaw rate error, which is a
measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM will attempt to correct the vehicles yaw
motion by applying differential braking to the left or right front wheel.
The amount of differential braking applied to the left or right front wheel is based on both the yaw rate error and side slip rate error. The
side slip rate error is a function of the lateral acceleration minus the product of the yaw rate and vehicle speed. The yaw rate error and
side slip rate error are combined to produce the total delta velocity error. When the delta velocity error becomes too large and the VSES
system activates, the drivers steering inputs combined with the differential braking will attempt to bring the delta velocity error toward
zero.
The VSES activations generally occur during aggressive driving, in the turns or bumpy roads without much use of the accelerator pedal.
When braking during VSES activation, the brake pedal will feel different than the antilock brake system (ABS) pedal pulsation. The
brake pedal pulsates at a higher frequency during VSES activation.
Conditions for Running the DTC
C0196 00
• The ignition is ON.
• The ignition voltage is greater than 8 volts.
• The vehicle is stopped or the vehicle speed is greater than 45 km/h (28 mph).
C0196 09 and 1A
• The ignition is ON.
• The ignition voltage is greater than 8 volts.
C0196 52
• The ignition is ON.
• The ignition voltage is greater than 8 volts.
• The yaw rate isolation test runs with any of the following conditions:
- The brake pedal is not pressed.
- ABS is not active.
- The vehicle speed is greater than 8 km/h (5 mph).
- The lateral accelerometer signal is less than 4.9 m/s² (0.5 g).
- VSES is not active on undriven axle and traction control system (TCS) is active.
Conditions for Setting the DTC
C0196 00
One of the following conditions exist:
• The yaw rate signal is less than 0.15 volt.
• The yaw rate signal is greater than 4.85 volts for 1 second.
C0196 09
The yaw rate input changes by greater than 6.8 radians/second² (390 degrees/second²).
C0196 1A
The yaw rate bias is greater than 0.12 radians/second (7 degrees/second).
C0196 52
The yaw rate error is greater than 0.09 radians/second (5 degrees/second) 30 times in one drive cycle.
Action Taken When the DTC Sets
• The EBCM disables the VSES for the duration of the ignition cycle.
• The driver information center (DIC) displays the SERVICE ACTIVE HANDLING message.
• The ABS/TCS remains functional.
Conditions for Clearing the DTC
• The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
• The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
Inspect the vehicle for proper steering alignment.
Circuit /System Testing
1. Ignition OFF, disconnect the harness connector at the yaw and lateral acceleration sensor.
2. Test for less than 5 ohms of resistance between the low reference circuit terminal D and ground.
⇒
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the
EBCM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal B and ground.
⇒
If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests
normal, replace the EBCM.
⇒
If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal,
replace the EBCM.
4. Verify the scan tool Yaw Rate Signal parameter is less than 0 volts.
⇒
If greater than the specified range, test the yaw rate sensor signal circuit terminal C for a short to voltage. If the circuit tests normal,
replace the EBCM.
5. Install a 3A fused jumper wire between the signal circuit terminal C and the 5-volt reference circuit terminal B. Verify the scan
tool lateral accelerometer is greater than 4.8 volts.
⇒
If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,
replace the EBCM.
6. If all circuits test normal, test or replace the yaw and lateral acceleration sensor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement
• Control Module References for EBCM replacement, setup, and programming
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DTC C0252
DTC Descriptor
DTC C0252: VSES Sensors Uncorrelated
Circuit/System Description
The vehicle stability enhancement system (VSES) is activated by the electronic brake control module (EBCM) calculating the desired
yaw rate and comparing it to the actual yaw rate input. The desired yaw rate is calculated from measured steering wheel position, vehicle
speed, and lateral acceleration. The difference between the desired yaw rate and actual yaw rate is the yaw rate error, which is a
measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM will attempt to correct the vehicles yaw
motion by applying differential braking to the left or right front wheel.
The amount of differential braking applied to the left or right front wheel is based on both the yaw rate error and side slip rate error. The
side slip rate error is a function of the lateral acceleration minus the product of the yaw rate and vehicle speed. The yaw rate error and
side slip rate error are combined to produce the total delta velocity error. When the delta velocity error becomes too large and the VSES
system activates, the drivers steering inputs combined with the differential braking will attempt to bring the delta velocity error toward
zero.
Conditions for Running the DTC
• The steer angle has been centered.
• The VSES is active.
• The direction, understeer or oversteer, of the yaw rate error has not changed.
• The centered lateral acceleration value is less than 4.9 m/s² (0.5 g).
• The yaw rate error is less than 0.1 rad/s (6 degrees/second).
• The side slip error is greater than 1.8 m/s² (0.18 g).
Conditions for Setting the DTC
One of the following conditions exists:
• The yaw rate error is greater than 0.17 rad/s (10 degrees/second) with the vehicle speed less than 60 km/h (37
mph) and the acceleration pedal is pressed greater than 25 percent of the pedal travel range for 1 second during
the VSES activation.
• With the yaw rate sensor less than 0.14 rad/s (8 degrees/second), the side slip error is greater than 4.9 m/s² (0.5 g)
for 5 seconds.
Action Taken When the DTC Sets
• The EBCM disables the VSES for the duration of the ignition cycle.
• The driver information center (DIC) displays the SERVICE ACTIVE HANDLING message.
• The antilock brake system (ABS) and traction control system (TCS) remains functional.
Conditions for Clearing the DTC
• The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
• The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
The following conditions can cause this concern:
• Improper steering alignment
• Open, short to ground, or short to voltage
• Internal yaw rate/lateral accelerometer sensor failure
• EBCM internal failure
Circuit/System Verification
1. Observe the SWPS Signal A and SWPS Signal B parameters with a scan tool while turning the steering wheel left and right.
Verify that the SWPS Signal A and SWPS Signal B parameters increase and decrease smoothly when the steering wheel is turned.
⇒
If the SWPS Signal A and SWPS Signal B parameters do not change smoothly, replace the steering wheel position
sensor.
2. Operate the vehicle within the conditions for setting the DTC. Verify DTC C0186, C0196, C0252, or C0710 are not set.
⇒
If DTC C0186, C0196,C0253, or C0710 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.
⇒
If DTC C0252 is set, replace the yaw and lateral acceleration sensor. If DTC C0252 sets again, replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• Steering Wheel Position Sensor Replacement
• Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement
• Control Module References for EBCM replacement, setup, and programming
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DTC C0253
DTC Descriptor
DTC C0253 00: Centering Error
Circuit/System Description
Steering angle centering is the process which calibrates the steer sensor output so that it reads 0 when the steering wheel is centered,
using data from the yaw rate sensor, lateral accelerometer and wheel speeds. Under normal circumstances steer angle centering occurs
after approximately 10 seconds of driving in a straight line on a fairly level surface (i.e. a typical road) at greater than 10 km/h.
The usable output voltage range for the yaw rate sensor signal and lateral accelerometer sensor signal is 0.25-4.75 volts. The scan tool
will report zero lateral acceleration or yaw rate as 2.5 volts with no sensor bias present. The sensor bias compensates for sensor
mounting alignment errors, electronic signal errors, temperature changes, and manufacturing differences.
Conditions for Running the DTC
The vehicle speed is greater than 40 km/h (25 mph).
Conditions for Setting the DTC
The vehicle has been driven for 10 minutes without completing steer angle centering.
Action Taken When the DTC Sets
• The EBCM disables the VSES for the duration of the ignition cycle.
• The driver information center (DIC) displays the SERVICE ACTIVE HANDLING message.
• The antilock brake system (ABS) and traction control system (TCS) remain functional.
Conditions for Clearing the DTC
• The condition for the DTC is no longer present.
• The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
The following conditions can cause this concern:
• Improper steering alignment.
• Internal yaw and lateral acceleration sensor failure.
• EBCM internal failure.
Circuit/System Verification
1. Observe the SWPS Signal A and SWPS Signal B parameters with a scan tool while turning the steering wheel left and right.
Verify that the SWPS Signal A and SWPS Signal B parameters increase and decrease smoothly when the steering wheel is turned.
⇒
If the SWPS Signal A and SWPS Signal B parameters do not change smoothly, replace the steering wheel position
sensor.
2. Operate the vehicle within the conditions for setting the DTC. Verify DTC C0186, C0196, C0253, or C0710 are not set.
⇒
If DTC C0186, C0196, or C0710 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.
⇒
If only DTC C0253 set, replace the yaw and lateral acceleration sensor. If DTC C0253 sets again, replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• Steering Wheel Position Sensor Replacement
• Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement
• Control Module References for EBCM replacement, setup, and programming
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DTC C0710
DTC Descriptors
DTC C0710 00: Steering Position Signal
DTC C0710 1A: Steering Position Signal Bias Level Out of Range
DTC C0710 1F: Steering Position Signal Intermittent
DTC C0710 52: Steering Position Signal Compare Failure
Circuit/System Description
The steering angle sensor supplies 2 analog inputs, position signal A and position signal B, to the electronic brake control module
(EBCM). The 2 input signals are approximately 90 degrees out of phase. By interpreting the relationship between the 2 inputs, the
EBCM can determine the position of the steering wheel and the direction of the steering wheel rotation.
Conditions for Running the DTC
C0710 00
• The ignition is ON.
• Ignition voltage is greater than 8 volts.
• The steering wheel position sensor has been powered ON for 0.2 second.
C0710 1A
• The ignition is ON.
• Ignition voltage is greater than 8 volts.
• The steering wheel position sensor is centered.
C0710 1F
• The ignition is ON.
• Ignition voltage is greater than 8 volts.
• The steering wheel position sensor has been powered ON for 0.2 second.
• The steering rate of position signal A is less than 80 degrees per second.
C0710 52
• The ignition is ON.
• Ignition voltage is greater than 8 volts.
• The steering wheel position sensor has been powered ON for 0.2 second.
• The steering wheel position sensor is centered.
Conditions for Setting the DTC
C0710 00
Both position signal A and position signal B are greater than 4.9 volts or less than 0.2 volt for 1.6 seconds.
C0710 1A
The steering bias is greater than 40 degrees.
C0710 1F
The difference in the phase angle between position signal A and position signal B is greater than 106 degrees or less than 84 degrees
continuously for 0.25 second.
C0710 52
The changes in position signal A or position signal B is greater than 36 degrees between consecutive scans of the signal.
Action Taken When the DTC Sets
• The EBCM disables the vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
• The driver information center (DIC) displays the SERVICE ACTIVE HANDLING message.
• The ABS remains functional.
Conditions for Clearing the DTC
• The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
• The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not
detected in 100 consecutive drive cycles.
Diagnostic Aids
• Inspect the vehicle for proper alignment. The car should not pull in either direction while driving straight on a
level surface.
• The Snapshot function on the scan tool can help find an intermittent DTC.
• Possible causes for this DTC are the following conditions:
- One of the steering wheel position sensor inputs are open, shorted to ground, or shorted to battery.
- Internal steering angle sensor malfunction.
- Noise on the steering wheel position signal circuits.
- Yaw and lateral acceleration sensor malfunction causing drifting signal outputs.
- Internal EBCM malfunction.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the steering position sensor.
2. Test for less than 5 ohms of resistance between the low reference circuit terminal 2 and ground.
⇒
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the
EBCM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
⇒
If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests
normal, replace the EBCM.
⇒
If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
4. Verify the scan tool SWPS signal A parameter is less than 0.2 volt.
⇒
If greater than the specified range, test the signal A circuit terminal 5 for a short to voltage. If the circuit tests
normal, replace the EBCM.
5. Verify the scan tool SWPS signal B parameter is less than 0.2 volt.
6. If greater than the specified range, test the signal B circuit terminal 6 for a short to voltage. If the circuit tests normal, replace
the EBCM.
7. Install a 3A fused jumper wire between the signal A circuit terminal 5 and the 5-volt reference circuit terminal 1. Verify the
scan tool SWPS signal A parameter is greater than 4.8 volts.
⇒
If less than the specified range, test the signal A circuit for a short to ground or an open/high resistance. If the
circuit tests normal, replace the EBCM.
8. Install a 3A fused jumper wire between the signal B circuit terminal 6 and the 5-volt reference circuit terminal 1. Verify the
scan tool SWPS signal B parameter is greater than 4.8 volts.
⇒
If less than the specified range, test the signal B circuit for a short to ground or an open/high resistance. If the
circuit tests normal, replace the EBCM.
9. If all circuits test normal, test or replace the steering position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• Steering Wheel Position Sensor Replacement
• Control Module References for EBCM replacement, setup, and programming



Recall for DTC C0710 for only as noted in GREEN
recall number - 10118 APR 10 Recall - Service Active Handling System Message
If you dont meet recall requirements, you can still investigate wiring connection yourself to ensure connector is snug, wiring is not tugging on the connector and you can install the comb yourself (see vid link).
#06-02-35-002B: Stabilitrak/Active Handling Light On, Service Stabilitrak/Active Handling Message on DIC, DTC C0710 Steering
NHTSA CAMPAIGN ID Number: 10V172000 NHTSA Action Number: EA09002
Wheel Position Sensor (SWPS) Signal Set (Install Clip in SWPS Connector) - (Oct 19, 2007)
Subject: Stabilitrak/Active Handling Light On, Service Stabilitrak/Active Handling Message on DIC,
DTC C0710 Steering Wheel Position Sensor (SWPS) Signal Set (Install Clip in SWPS
Connector)
This bulletin is being revised to update the models and provide new correction information. Please discard Corporate Bulletin
Number 06-02-35-002A (Section 02 -- Steering).
Condition
Some customers may comment on a Stabilitrak® or Active Handling System light being illuminated. Also, this warning light will be
accompanied by a SERVICE STABILITRAK or SERVICE ACTIVE HNDLG message on the DIC.
Summary:
GM IS RECALLING CERTAIN MODEL YEAR 2005 AND 2006 CHEVROLET CORVETTE PASSENGER CARS MANUFACTURED BETWEEN MARCH 2004 AND JANUARY 2006 EQUIPPED WITH A TILT AND TELESCOPING STEERING COLUMN (RPO N37). IN RARE CASES, REPEATED MOVEMENT OF THE STEERING COLUMN MAY CAUSE A SIGNAL INTERRUPTION WITHIN THE COLUMN. IF THIS OCCURS, THE MESSAGE, "SERVICE ACTIVE HANDLING SYSTEM" WILL APPEAR IN THE DRIVER INFORMATION CENTER, AND ONE OR MORE OF THE BRAKES MAY APPLY, POSSIBLY CAUSING THE VEHICLE TO PULL TO THE RIGHT OR LEFT.
Diagnosis with a scan tool may reveal a DTC C0710.
Cause
The most likely cause of a DTC C0710 on a vehicle equipped with telescoping/tilt steering wheel is high resistance in SWPS connector
C202. Fretting terminal corrosion may be present in the SWPS connector due to the telescoping motion of the steering column. When
the steering column is telescoped in and out, the female terminals within the SWPS connector may move on the male terminals of the
SWPS. This movement between the terminals may cause a high resistance condition in the SWPS connector.
link to DIY of comb in the connector... http://s680.photobucket.com/albums/v...cpZZ1QQtppZZ20
Correction
1. Remove the driver's side closeout (insulator) panel.
1. Locate the SWPS connector that connects to the steering angle sensor, located on the lower center of the steering column.
1. Install the clip (1), P/N 19179794, into the connector. This clip will act as a terminal positive assurance (TPA) and prevent any
movement of the terminals.
1. Reinstall the closeout panel.
1. Clear the DTC with a scan tool and road test the vehicle.
1. If DTC C0710 resets during the road test, refer to DTC C0710 in SI.
Parts Information
Part Number Description Qty
19179794 Clip, Steering Angle 1
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
E9464* Install Clip into Steering Wheel Position Sensor
(SWPS) Connector 0.3 hr
* This labor operation number is for bulletin use only. This number will not be published in the Labor Time Guide.

VETFEVER

bump

vetfever

bonnell

I guess I'm going to have to take mine in for service. When leaving the driveway this morning I got the Service Active Handling System message. At the stop sign I turned the car off and back on. The message was gone but reappeared shortly after and stayed on. I have a 2008 vert 3LT with Z51 and less than 17K miles.

Zap City

I just got it too. 12 GS vert with 1214 miles. Damn. I felt a slight yaw and loss of power before the message tripped on the DIC. PITA.

repo

http://www.rdio.com/artist/A_Silent_..._Wishing_Well/

ChevyDave

Z06Ronald

+1 ...

franman69

Bump to mark this thread (unfortunately)

Silverado Desperado

Service Active Handling message is displayed as soon as car is started (after self check and "Corvette by Chevrolet" sequence finishes when the car is started).

Service Active Handling message is always on while driving unless another button is pushed to check something else.

Tech 2 shows no codes. Car Battery is new. Car operates and drives without issue.

Any ideas or suggestions?

Silverado Desperado

ttt

Bluewheelz

Bump. Lots of good information here.