Oldsmobile Code P1189 is a trouble code that indicates a malfunction in the engine oil pressure switch circuit. This code is usually triggered when the PCM detects an open EOP switch circuit for 10 seconds, the engine has been started, and the ECT sensor is less than 50°F. The causes of this code could be an open EOP switch circuit, a damaged engine oil pressure switch, or a failed PCM. To fix this issue, the Failure Records must be checked and the PCM, the EOP switch circuit, and the engine oil pressure switch must be inspected.
Causes and Solutions of Oldsmobile Code P1189
| Cause | Solution |
|---|---|
| EOP Switch Circuit is Open | Inspect the PCM and the EOP switch circuit for open connections |
| Engine Oil Pressure Switch is Damaged | Check the engine oil pressure switch for a possible open circuit |
| PCM has Failed | Look up the Failure Records and check the PCM for any issues |
| ECT Sensor is Below 50°F | Make sure the ECT sensor is at a temperature above 50°F |
Oldsmobile Code P1189 is a common trouble code that can cause various issues with the vehicle. When this code is triggered, it indicates a malfunction in the engine oil pressure switch circuit. In order to diagnose and repair this issue, the Failure Records must be checked and the PCM, the EOP switch circuit, and the engine oil pressure switch must be inspected. The common causes of this code are an open EOP switch circuit, a damaged engine oil pressure switch, or a failed PCM, and the solutions to these issues can vary depending on the cause.
EOP Switch Circuit is Open
If the EOP switch circuit is open, the PCM and the EOP switch circuit must be inspected for open connections. If any connections are open, they must be replaced or repaired.
Engine Oil Pressure Switch is Damaged
If the engine oil pressure switch is damaged, the Failure Records must be checked and the engine oil pressure switch must be inspected for a possible open circuit. If any connections are open, they must be replaced or repaired.
PCM has Failed
If the PCM has failed, the Failure Records must be looked up to check for any issues. If any issues are found, the PCM must be replaced or repaired.
ECT Sensor is Below 50°F
If the ECT sensor is below 50°F, the temperature must be raised to a temperature above 50°F. This can be done by running the engine for a few minutes.
Conclusion
Oldsmobile Code P1189 is a common trouble code that can cause various issues with the vehicle. To diagnose and repair this issue, the Failure Records must be checked and the PCM, the EOP switch circuit, and the engine oil pressure switch must be inspected. The common causes of Oldsmobile Code P1189 are an open EOP switch circuit, a damaged engine oil pressure switch, or a failed PCM, and the solutions to these issues can vary depending on the cause.
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