Diagnostic Aids

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

If a TP sensor 1 or 2 DTC is also set, diagnose that DTC first. Then if DTC P0638 is also set, diagnose that DTC next. See DTC P0638: THROTTLE ACTUATOR CONTROL COMMAND PERFORMANCE . Then if DTC P2101 is also set, diagnose that DTC next. See DTC P2101: THROTTLE ACTUATOR CONTROL MOTOR POSITION PERFORMANCE .

If DTC P2176 is set, the ECM will default to one of the two limp home modes (random injector disable with engine speed limited to 2600 RPM). The REDUCED POWER telltale will be illuminated and the ECM will remain in this condition for the entire ignition cycle even if the fault is corrected.

The throttle body relearn procedure should be performed anytime a throttle body has been replaced or an ECM has been replaced or reprogrammed. See THROTTLE BODY RELEARN PROCEDURE under PROGRAMMING.

NOTE: DTC P2176 must have a key cycle to clear. Therefore, it may take 2 times to clear the DTC from ECM memory