Diagnostic Aids

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

These DTCs cannot be retrieved with a current status. Diagnosis of current DTCs is accomplished via the symptom. Refer to Scan Tool Does Not Communicate With Class 2 Device .
An intermittent condition is likely to be caused by a short or an open on the class 2 serial data circuit. Use the Scan Tool Does Not Communicate With Class 2 Device procedure in order to isolate an intermittent condition.