Engine Coolant Heater A Control Circuit Driver Current/Temperature Too High
Engine Coolant Heater A Control Circuit Driver Current/Temperature Too High: the component is overheating, typically from extended load or slip.
Affected components
- Coolant heater a
- Heater driver
Common causes
- High likelihood: Short circuit in heater wiring or element
Possible symptoms
- Check engine light on
- Cooling fan runs constantly or not at all
- Cabin heater weak or excessively hot
- Possible long warm-up time or hard cold start
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
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.