Engine Coolant Level Sensor/Switch Circuit High
Coolant level sensor signal voltage above the upper limit — short to reference voltage or open signal return.
Affected components
- Coolant level sensor
- Sensor wiring
Common causes
- High likelihood: Signal wire shorted to reference voltage
- Low likelihood: Connector pins corroded - high contact resistance
- Low likelihood: Supply wire pinched against B+ source
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
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.