Diagnostic Aids

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.

Inspect for the following conditions:

An open or shorted TCC Solenoid
Faulty electrical circuits - open or short to ground between the TCC Solenoid and the PCM
A faulty PCM

An intermittent may be caused by the following conditions:

A poor connection
Rubbed through wire insulation
A broken wire inside the insulation

Inspect the PCM harness connectors for the following conditions:

Backed out terminals
Improper mating
Broken locks
Improperly formed or damaged terminals
Inadequate terminal-to-wire connections

Perform the following steps if DTC P0773 cannot be duplicated:

Read the information in the freeze frame data.
Use the data to determine the vehicle operating conditions when the DTC was set.

If any wiring repairs need to be made, refer to Repair Procedures in Electrical Diagnosis.