Engine Oil Pressure Sensor Circuit Performance (GM)
What does P1184 mean?
The P1184 code means the vehicle's onboard diagnostic system has detected: Engine Oil Pressure Sensor Circuit Performance (GM). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Oil pressure gauge reading erratically
- Low oil pressure warning light
- Possible reduced engine power mode
- Ticking or tapping noise from engine
Probable Causes (Ranked by Likelihood)
- Faulty oil pressure sensor/switch Very High
- Low engine oil level High
- Worn engine bearings causing actual low oil pressure Moderate
- Clogged oil pickup screen Moderate
- PCM circuit issue Low
Step-by-Step Diagnostic Procedure
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Check engine oil level and condition first
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Install a mechanical oil pressure gauge to verify actual pressure
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Compare mechanical gauge reading to scan tool oil pressure data
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Replace the oil pressure sensor if actual pressure is normal but readings are wrong
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If actual pressure is low, investigate engine mechanical condition
Frequently Asked Questions
Is low oil pressure serious?
If actual oil pressure is low, it is very serious. Low oil pressure can cause rapid engine wear and failure. Always verify actual oil pressure with a mechanical gauge before assuming the sensor is the problem.
How do I know if it is the sensor or actual low pressure?
Install a mechanical oil pressure gauge in place of the sensor. If the mechanical gauge shows normal pressure (typically 25-65 PSI at operating temperature), the sensor is faulty. If pressure is actually low, the engine needs attention.
Are GM oil pressure sensors known to fail?
Yes. The oil pressure sensor on GM trucks and SUVs with the 5.3L and 6.2L V8 engines is a common failure item. The sensor is inexpensive and relatively easy to replace on most models.