Action Taken By PCM

WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

PCM performs the following actions if DTC is set:

The PCM illuminates the MIL for California emission vehicles.
The PCM inhibits TCC engagement.
The PCM commands increased line pressure.
The PCM inhibits 4th gear if transmission fluid temperature is greater than 266°F (130°C).
The PCM freezes shift adapts from being updated.
The PCM records the operating conditions when the conditions for setting the DTC are met. The PCM stores this information as freeze frame (California only) and failure records (California and Federal).
The PCM stores DTC P1860 in PCM history.