Action Taken When the DTC Sets: P0843
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 ECM to illuminate the malfunction indicator lamp (MIL).
- When in a forward range and shifting is completed, the transmission will shift to another forward range, unless the transmission is compromised by over-speeding or direction change, then the transmission will shift to NEUTRAL.
- When in a forward range and the shift is in process the transmission will return to a previous range, except for 1-2 shifts and 2-1 shifts which will be completed.
- While diagnostic response is active, when the shift selector is moved from a forward range to NEUTRAL or from a forward range to REVERSE, then the transmission will shift to NEUTRAL.
- DTC P0843 is stored in TCM history.
- The TCM freezes shift adapts.
- The TCM inhibits torque converter clutch (TCC) engagement.