For 1990-2009 cars

# OIL PRESSURE SWITCH/SENDER WIRING (NEW SERVICE PROCEDURE)

#### SUBJECT: OIL PRESSURE SWITCH OR SENDER/SWITCH WIRING (SERVICE PROCEDURE)

#### VEHICLES AFFECTED: 1991 'C' MODELS

#### CONDITION:

----------- Inoperative or "on" continually oil pressure warning lamp, low pressure indication or erratic oil pressure gauge or blown ignition fuse for circuit 839.

#### CAUSE:

------ Oil pressure warning lamp/sender switch and fuel pump harness rubs through and opens or shorts to ground at the oil filter adapter housing.

#### CORRECTION:

----------- Repair or replace the wire(s) and install a piece of electrical conduit long enough to protect the harness from rubbing at the oil filter adapter housing. Refer to Figure 1.

Vehicles built after the VINS listed below have the conduit installed.

#### PLANT

Wentzville M1691055 (Buick) Orion M4338422 (Olds)

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.