SERVICE DIAGNOSIS PROCEDURE CODE F41 SET

MODELS AFFECTED: 1988 DEVILLES AND FLEETWOODS

Some 1988 DeVilles and Fleetwoods may turn the Coolant Temp/Fan telltale on intermittently and set BCM code F41. Code F41 was eliminated on 1988 DeVilles and Fleetwoods with the elimination of the cooling fan module. However, if the incorrect BCM PROM is installed in these vehicles, code F41 may set as a result.

To check for an incorrect BCM PROM, check BCM parameter P.3.1 BCM PROM I.D. The correct BCM PROM I.D. for 1988 DeVilles and Fleetwoods is 22 or 23. If the BCM PROM I.D. is less than 22 (i.e., 20 or 21), replace the BCM PROM with the proper one as listed in the parts catalog, Section 3.670.

For warranty purposes use Labor Operation N4801 at .4 hour for BCM PROM replacement.

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.