ECM APPLICATION CHANGE NEW ECM PART NUMBER

Models Affected: Some 1985 Rivieras Equipped with 5.0L Engine (Vin Code Y)

A change was made in the ECM application used with the 5.0L V-8 engine (VIN Code Y) in some 1985 Buick Rivieras. The diagnostics for both units remains the same; however, the ECMs are not interchangeable. The second type ECM, part number 1227076 replaces the first type ECM, part number 1226866 on Buick Rivieras built after serial number FE431276.

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.