DTC P0878 P2714 P2723 Transmission Slips In 1st 2nd 3rd Or 4th Gears And/Or Long Garage Shifts To Drive - keywords delay engage MIL
| 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This PI was superseded add dtc P0878.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. |
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
