Action Taken By PCM

WARNING: This page does not describe the selected car, but rather 36 other vehicles, including the 2002 Pontiac Firebird, 2002 Oldsmobile Bravada, 2002 GMC Yukon XL, 2002 GMC Yukon, and 2002 GMC Sonoma. However, it is still accessible from the selected car via links, so may be relevant.

PCM performs the following actions if DTC is set:

Illuminates MIL at second consecutive failure signal.
Commands maximum line pressure.
Inhibits TCC engagement.
Inhibits 4th gear if transmission is in hot mode.
Freezes shift adapts from being updated.
Records operating conditions when conditions for running DTC are met.
DTC P1870 is recorded in history.