P1187 BUICK Possible Causes
- Faulty engine oil temperature sensor
- Engine oil temperature sensor harness is open or shorted
- Engine oil temperature sensor circuit poor electrical connection
How to Fix Code P1187 BUICK?
Start by checking the “possible causes” listed above. Visually inspect the related 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 Service Engine Soon Warning Light)
P1187 BUICK Meaning
The Powertrain Control Module (PCM) monitors the engine oil temperature sensor. The PCM sets the OBDII code when the engine oil temperature sensor is not within factory specifications.