GM 12677838
Oil Pressure Sending Unit

The service procedure for the oil pressure switch starts with lifting and supporting the automobile. Begin by disconnecting the electrical connector from the oil pressure sender before you can remove the sender. During installation follow these instructions for the oil pressure sender installation: screw it in and tighten it to 10 N.m (89 lb in). Connect the electrical connector to the oil pressure sender afterward lowering the vehicle.

To replace the engine oil pressure sensor or switch, one may need the following tools: Oil Pressure Switch socket (J 41712). Clean up around the oil pressure sensor first to ensure that no dirt gets into the engine. Disconnect the Fuel Pump/oil pressure sensor elect. Connector and remove the Fuel Pump/oil pressure sensor by using Oil Pressure Switch socket (J 41712). The alignment of the engine oil pressure sensor fitting should be noted before its removal, while removing such a fitting if necessary. For reusing the old fitting, smear sealant on the threads and screw it down until snug then tighten it to 15 n.m (11 lb ft) and modify the torque so that the centerline of the fitting is 50 degree off of the centerline of the crank shaft. In case of reusing the old sensor, apply sealant to the sensor's threads before installing the sensor with the help of the Oil Pressure Switch socket (J 41712) and tighten it to 30 n.m (22 lb ft). Finally, reconnect the Fuel Pump/oil pressure sensor electrical connector and check and adjust the engine oil, if necessary.

Install the oil pressure switch and tighten it to 10 N.m (89 lb in).

Connect the electrical connector to the oil pressure switch and lower the vehicle.

Tighten it to 10 N.m (89 lb in).

Use the Oil Pressure Switch Socket (J41712) to remove the switch from the oil filter adapter.

Lower the vehicle and inspect for oil leaks after starting the engine.

Reinstall the engine cover.

Install the fitting and tighten it to 15 Nm (11 ft. lbs.), ensuring not to loosen or over-tighten it more than one turn for alignment.

Use J 41712 (Oil Pressure Switch Socket) to remove the fuel pump/oil pressure sensor.

Apply sealant to the threads of the fitting.

Note the alignment of the engine oil pressure sensor fitting prior to removal.

Clean the area around the oil pressure sensor to prevent debris from entering the engine.

Note the alignment of the engine oil pressure sensor fitting prior to removal.

First, remove the engine cover.

Using the Oil Pressure Sensor Socket (J41712) or an equivalent tool, install the oil pressure sensor and tighten it to 20 Nm (15 ft. lbs.).

Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads.

If necessary, remove the engine sight shield.

Disconnect the fuel pump/oil pressure sensor electrical connector and use J 41712 (Oil Pressure Switch Socket) to remove the fuel pump/oil pressure sensor.

Install the oil pressure sensor (706) and washer (707) using J 41712 (Oil Pressure Switch Socket) and tighten to 35 Nm (26 lb ft).