Motor Electronics Coolant Temperature Sensor Low Input
Voltage at motor electronics coolant temperature sensor below 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.
Affected components
- Motor electronics coolant temperature sensor
- Wiring harness
Common causes
- High likelihood: Short to ground
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.