Diagnostic Aids

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

Find out from the customer under what condition was the DTC set. This information will help to duplicate the failure.
Check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a level surface.
During diagnosis, park the vehicle on a level surface.
Check for malfunctioning EBCM and lateral accelerometer.
The snapshot function on the scan tool can help find an intermittent DTC.