Engine Coolant Heater A Control Circuit Driver Current/Temperature Too High

Common symptoms

What you'll notice

• Inspect and repair any loose or damaged wiring connections related to the engine coolant heater control circuit.
• Check the engine coolant heater control circuit fuse and replace if necessary.
• Replace the engine coolant heater control circuit driver if it is determined to be faulty.
• Clear the error code to see if it returrns

Common causes

Most likely first

1. Faulty engine coolant heater control module
2. Short circuit in the engine coolant heater control circuit
3. Overheating of the engine coolant heater due to coolant blockage
4. Malfunctioning engine coolant temperature sensor
5. Issues with the engine coolant heater control relay

How to diagnose & fix

Work through it in order

1. Overheating of the engine
2. Engine misfires or stalls
3. Decreased fuel efficiency
4. Poor acceleration or lack of power
5. Check engine light illuminates