Engine Oil Temperature Sensor Out of Self-Test Range
The P1184 code indicates that the engine oil temperature (EOT) sensor reading is outside the expected range during the powertrain control module's (PCM) self-test. This typically occurs when the sensor voltage is too high or too low, or the temperature reading is implausible given engine operating conditions. The PCM uses the EOT sensor to monitor oil temperature for engine protection and performance adjustments. A faulty sensor, wiring issues, or low oil level can trigger this code.
01. Most Common Causes
- Faulty engine oil temperature sensor
- Open or shorted wiring/connector to EOT sensor
- Low engine oil level or poor oil quality
- PCM software or hardware issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible engine overheating or temperature gauge erratic
- Reduced engine performance or fuel economy
- Engine may enter limp mode
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect EOT sensor connector and wiring for damage or corrosion.
Step 3: Check engine oil level and condition; top off or change if necessary.
Step 4: Test EOT sensor resistance and compare to specifications; replace if out of range.
Step 5: Clear codes and test drive to verify repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as incorrect oil temperature readings can lead to engine damage. Have the vehicle inspected promptly.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, plus diagnostic fees. Costs vary by vehicle and labor rates.