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 and shifting is completed, the transmission will fail to another forward range when engine speed is reasonable.
When in NEUTRAL or REVERSE, the transmission fails to NEUTRAL.
While diagnostic response is active, 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 and a forward range cannot be attained again.
DTC P0845 will be stored in TCM history.
The TCM freezes shift adapts (DNA).
The TCM inhibits torque converter clutch (TCC) engagement.