P1187 CADILLAC Possible Causes
- Faulty engine oil temperature sensor
- Engine oil temperature sensor harness is open or shorted
- Poor electrical connection in the engine oil temperature sensor circuit
How to Fix Code P1187 CADILLAC?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Engine light on (or engine service soon warning light)
P1187 CADILLAC Meaning
The Powertrain Control Module (PCM) monitors the engine oil temperature sensor. The PCM sets the OBDII code when the engine oil temperature sensor does not meet factory specifications.