Action Taken When the DTC Sets
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- The TCM illuminates the malfunction indicator lamp (MIL).
- When in a forward range, the transmission fails to 1st, 3rd, or 5th range 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, unless the transmission is compromised by a direction change, then the transmission will shift to or lock in NEUTRAL.
- If the shift selector is returned to a forward range and the transmission is compromised by over speeding or direction change, the transmission will lock in NEUTRAL.
- DTC P0748 will be stored in TCM history.
- The TCM freezes shift adapts.
- The TCM inhibits TCC engagement.