Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0770 will set when one of the following conditions are met:

TCC lock-up does not occur after the PCM commands the TCC to apply.
TCC remains locked-up even after the PCM commands the TCC to release.