P0964, P0966 or P0967
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- The TCM requests the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL).
- If the fault occurs while in a forward range, a shift to 1st, 3rd or 5th range is made.
- While diagnostic response is active, if the shift selector is moved to NEUTRAL, the transmission will shift to NEUTRAL. If the shift selector is moved to REVERSE, the transmission will shift to REVERSE. If the shift selector is moved to a forward range or to REVERSE and the transmission is compromised by over-speeding or direction change, the transmission will shift to NEUTRAL.
- DTC P0964, P0966, or P0967 is stored in TCM history.