GMRULZ

I`ve searched and searched, found it before, but could not today. Please help. Thanks!

Chevtech

Hopefully one of these is what you are after.

#PIP4304A: DTC P0878 P2714 P2723 Transmission Slips In 1st 2nd 3rd Or 4th Gears And/Or Long Garage Shifts To Drive - keywords delay engage MIL - (Feb 11, 2008)

Subject: DTC P0878, P2714, P2723, transmission slips in 1st, 2nd, 3rd or 4th gears and/or long garage shifts to drive


Models: 2008 Cadillac CTS, Escalade, Escalade ESV, Escalade EXT, SRX, STS, STS-V, XLR, XLR-V

2008 Chevrolet Corvette, Silverado, Suburban,

2008 GMC Sierra, Yukon Denali, Yukon Denali XL

2008 Hummer H2

Equipped With a 6L50 (MYB), 6L80 (MYC) or 6L90 (MYD) Transmission




--------------------------------------------------------------------------------

This PI was superseded add dtc P0878. Please discard PIP4304.


--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Customer concerns where the MIL may be illuminated and DTC P2714 and or P2723 usually along with P0878 may be found in the TCM as active or history codes. Additionally, a DTC may not be set and the customer may comment on very long park/neutral/reverse to drive garage shifts (2-3 seconds) or transmission slipping or flaring when shifting into 1st, 2nd, 3rd or 4th gears (upshifts/downshifts/steady state high throttle conditions)

Important: The above information would only apply to vehicles built between Oct 15, 2007 and 15 Jan 2008 (use GM VIS to verify).

Recommendation/Instructions:
Confirm condition in vehicle

• Drive the vehicle to verify customer concern


• Time the garage shift from lever movement to engagement into drive (greater than 2 seconds indicates a concern).


• Clutch slippage during "Stall" maneuver in drive (Chock a wheel, apply park brake and service brake, transmission in drive, increase throttle, limit to 2000 RPM, limit time to 2 seconds, stop test immediately if flare occurs).


If vehicle operates correctly condition may have corrected itself (sediment dislodged and blown out to sump) and part replacement may not be necessary

• If oil is in good condition (red in color) and does not have a burned odor, clear any DTCs, repeat drive audit, if no issues, return vehicle to customer.


• If oil is darkened with a distressed odor and/or pan has excessive clutch debris, disassemble the transmission for cleaning and to replace the 1-2-3-4 clutch plates, flush and flow check the transmission cooler using J-45096.


If condition is confirmed, remove transmission oil pan and inspect for darkened oil (Black / dark red in color) with a distressed odor and/or excessive clutch material in pan.

• If oil is in good condition and pan is clean, replace Control Solenoid Valve and Transmission Control Module Assembly


• If oil is darkened with a burned odor and/or pan has excessive clutch debris replace Control Solenoid Valve and Transmission Control Module Assembly and disassemble the transmission for cleaning and to replace the 1-2-3-4 clutch plates, flush and flow check the transmission cooler using J-45096.

Or:


#PIP4184B: MIL And Any Combinationof DTC P0756 P0776 P0796 P2714 P2723 - keywords intermittent ses - (Dec 20, 2007)
Subject: MIL And Any Combination of DTC P0756, P0776, P0796, P2714, P2723


Models: 2006-2008 Cadillac XLR-V, STS-V

2008 Cadillac CTS

2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT, SRX, STS, XLR

2006-2008 Chevrolet Corvette

2007-2008 Chevrolet Silverado

2007-2008 GMC Sierra, Yukon Denali, Yukon Denali XL

2008 Hummer H2

Equipped With 6L50, 6L80 or 6L90 (RPOs MYB, MYC, MYD) Automatic Transmission




--------------------------------------------------------------------------------

This PI Supersedes To Add Models. Please Discard PIP4184A.


--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Some customers may comment on a transmission concern where the MIL is illuminated and any of the above listed DTCs may be found in the TCM as active or history codes.

Recommendation/Instructions:
Perform the following service procedures:

Record Freeze Frame / Failure Data for all DTCs. This can be done electronically with the Tech 2 by capturing the data or by manually writing down the parameters. This data may be requested by TAC if further assistance is needed.
Check and note the transmission fluid level and condition. If the level is high or low it should be corrected and the vehicle road tested to verify that the condition is still present.
Remove the transmission bottom pan to inspect for possible debris. If debris is found the transmission should be disassembled to determine the source. Repair or replace the transmission in the most economical method following guidelines in the latest version of bulletin 02-07-30-029.
If no debris is noted in the oil pan remove the valve body / control solenoid and module assembly. Disassemble the valve body to: Inspect the check ***** for roundness ensuring that there are no flat spots. Inspect the spacer plate for debris, burrs or flashing on the orifices. Measure all the valve body bore plug (328) diameters. Specification = 11.502 mm +/- 0.004 mm. Undersize bore plugs should be replaced. Inspect all valves for freedom of movement and correct travel.
Based on the specific DTC carefully inspect the following valves for freedom of movement and correct travel.
P0756 - Clutch select valve 3 (352) (closer to the manual valve) in the lower valve body (307).

P0776 - 3-5-R clutch regulator valve (336) in the upper valve body (321).

P0796 - CBR1/4-5-6 clutch regulator valve (327) in the upper valve body (321).

P2714 - 2-6 clutch regulator valve (334) in the upper valve body (321).

P2723 - 1-2-3-4 clutch regulator valve (337) in the upper valve body (321).`

• If a concern is found in the respective valve line-up remove the valve from the valve body.

• Once valve is removed inspect for any scratching or scoring.

• If any is found then the fingernail test will need to be performed.

• Using your fingernail to move over scratches to see if nail will try to catch on the scratch or score.

• If so then valve body will need to be replaced.

• It has been found that in most cases that the scratches are not severe enough to catch your fingernail.

• In this case the valve should be cleaned with some type of contact or brake cleaner.

• The bore should also be cleaned. Clean with machined side down so debris may escape.

• Blow off with shop air.

• To verify free movement of the valve, dip into clean ATF and install valve back into the bore, the valve should move freely. If the valve moves freely, in most cases the valve body will function properly when reinstalled.

• Reassemble and retest.

If no issues are noted in the valve body inspection replace the control solenoid and module assembly (314). If the concern was a DTC P2723 the input / output speed sensor assembly (303) should also be replaced.

GMRULZ

Thanks!

Vettlldo

On my '06 A6, I have noticed a long pause between Reverse and Drive after startup. Looks like it's time for a dealer checkup before my warranty expires next month.

danl72

Great info.