P0189
PowertrainTemperature Sensorlow severityFuel Temperature Sensor B Circuit Intermittent
What P0189 Means
The second fuel temperature sensor signal is dropping out intermittently. Usually a wiring or connector problem rather than the sensor itself.
Symptoms
- Check engine light on
- Intermittent rough running
- Erratic fuel trim
Common Causes
- Loose or corroded connector
- Chafed or damaged wiring
- Failing fuel temperature sensor B
- Faulty PCM
Diagnostic Steps
- Scan for stored codes
- Inspect connector and harness
- Wiggle-test wiring while watching signal
- Replace sensor if it drops out
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✓ Autel official store
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