P0117
PowertrainTemperature Sensormoderate severityECT Sensor 1 Circuit Low Input
What P0117 Means
The ECT sensor voltage is lower than expected, indicating very high temperature or short.
Symptoms
- Check Engine Light
- Fans running constantly
- Incorrect high temp reading
Common Causes
- Short to ground
- Faulty sensor
- Damaged wiring
Diagnostic Steps
- Test sensor resistance
- Check for shorts
- Inspect wiring
Where to start: Repair short or replace sensor.
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