Faulty Oil Temperature Sensor
Oil Temperature Sensor harness is open or shorted
Oil Temperature Sensor circuit poor electrical connection
Faulty Instrument Panel Cluster (IPC)
Engine Light ON (or Service Engine Soon Warning Light)
The Instrument Panel Cluster (IPC) supplies a 5-volt reference signal to Oil Temperature Sensor. When engine oil is cold, sensor resistance will decrease, and IPC reference voltage level will drop. IPC measures reference voltage change and displays the calculated value on the oil pressure gauge.