Insufficient Coolant Temperature for Stable Operation
Coolant temperature stays below the value expected for stable engine operation. Almost always points to a thermostat stuck open or a sensor reading lower than the actual engine temperature.
Affected components
- Thermostat
- Coolant temperature sensor
Common causes
- High likelihood: Thermostat stuck open
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
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.