Powertrain
generic / SAE
P0A03
Motor Electronics Coolant Temperature Sensor High Input
Voltage at motor electronics coolant temperature sensor above threshold. The engine coolant temperature sensor feeds warm-up enrichment, fan control and closed-loop entry — a stuck-cold reading keeps the engine in open loop and rich forever.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberA / 03
Possible causes
- Open sensor circuit high
Inspection / repair
- Difficulty: shop only
- DIY: shop recommended
- Estimated cost: 300–1200 €
- Estimated time: 1.5–4 h
- Component: motor electronics coolant temperature sensor
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012