'454 SS' -FALSE CODE 32 REVISED CALIBRATION PROM

Model and Year: 1990 C1 (SS ONLY) TRUCK WITH 7.4L (VIN CODE N) ENGINE

Owners of some 1990 Chevrolet "SS" trucks with 7.4L TBI engine may experience a false "Service Engine Soon" light.

This condition may be the result of the engine calibration.

If Code 32 (EGR diagnostic) cannot be repaired using normal service procedures, a revised calibration PROM should be installed.

New PROM Broadcast Scan Transmission Kit Number Code Tool I.D.

Automatic 16151508 AUMU 1281

Part is currently available from GMSPO.

Use Labor Operation #T0500. Use Labor Time of .6 hr.

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.