P1189 BUICK - Engine Oil Pressure Switch Fault
P1189 BUICK Possible Causes
- Faulty Engine Oil Pressure Switch
- Engine Oil Pressure Switch harness is open or shorted
- Engine Oil Pressure Switch circuit poor electrical connection
How is the P1189 BUICK code repair?Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
What is the cost to diagnose the P1189 BUICK code
Labor: 1.0The cost to diagnose the P1189 BUICK code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected?If the engine has not been cranked and oil pressure has been detected the P1189 code will set.
- Engine Light ON (or Service Engine Soon Warning Light)
P1189 BUICK MeaningThe low oil pressure sensor is normally closed. When oil pressure increases above 1 to 4.5 psi the switch contacts open. The Powertrain Control Module (PCM) supplies 12 volts to the oil pressure input circuit. With low oil pressure the 12 volts is pulled low to ground. This diagnostic tests for a open condition of the oil pressure switch circuit. If the engine has been off long enough for engine temperature to drop by 10°C, then a shorted (low oil pressure) condition of the circuit should be observed prior to engine running.
More InformationNeed more information on how to fix the P1189 BUICK code?
Get Access to Factory Service Manuals