16502moderate severityPowertrain
Engine Coolant Temperature Circuit High Input
on 2015 Volkswagen Golf 1.8L I4 TSI · FWD
What this code means
The coolant temperature sensor signal is too high (OBD P0118), indicating an implausibly cold reading. Often an open circuit or bad sensor.
Symptoms
- Hard cold start
- Rich running
- Check engine light on
Common causes
- Open circuit in wiring
- Faulty coolant temperature sensor
- Connector fault
- Faulty ECM
Diagnostic steps
- Read live coolant temp data
- Inspect wiring for open circuit
- Test sensor resistance
- Check connector and pins
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