SERVICE MANUAL UPDATE DIAGNOSTIC CODES

1988 RIVIERA AND REATTA MODELS WITH 3800 (VIN C)

Revised Diagnostic Chart for Codes E063, E064, E065 for 1988 3800 (VIN C) Riviera and Reatta series vehicles. Revision to Correct the error in ECM override callouts from ES01, ES02 and ES03 to the correct ones of ES02, ES03 and ES04.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.