EGR CONTROL ERROR CODE 53 NEW PROM RELEASE

MODEL AND YEAR: 1986 CAPRICE WITH 5.0L LG-4 ENGINES (ENGINE CODE H)

In most cases, normal diagnostic and repair will correct customer complaints of "Service Engine Soon Light" Code 53 (EGR Control Error). If the diagnostics shown in your 1986 Shop Manual (Section 6E1) shows the problem to be no trouble found, it will be necessary to change the PROM in the ECM. Below is a listing of new PROM numbers released to correct this condition.

On Federal Emission (NA-5) Caprice Models

1. Coupes and Sedans Use PROM 1228284 2. Wagons with GU2 (2.73) Axle Use PROM 1228285 3. Wagons with GU4 (3.08) Axle Use PROM 1228286

On California Emission Caprice Models

1. Coupes and Sedans Use PROM 1228287 2. Wagons with GU2 (2.73) Axle Use PROM 1228288 3. Wagons with GU4 (3.08) Axle Use PROM 1228289

Use applicable Labor Time and Operations Numbers.

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.