Document ID# 2046712

Subject: DTC P2714 P2723 Transmission Slips 1st 2nd 3rd Or 4th Gears And/Or Long Garage Shifts To Drive - keywords delay engage MIL #PIP4304 - (12/27/2007)

Models: 2008 Chevrolet Corvette, Equipped With a 6L50 (MYB), 6L80 (MYC) or 6L90 (MYD) Transmission

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 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.