P01EE
Engine Coolant Heater B Control Circuit High
Generic OBD-II
Common symptoms
What you'll notice
- Check the wiring and connections of the engine coolant heater circuit
- Replace the engine coolant heater control module
- Inspect and replace the engine coolant temperature sensor
- Verify and repair any issues with the engine coolant heater relay
Common causes
Most likely first
- Faulty engine coolant heater relay
- Short circuit in the engine coolant heater B control circuit
- Faulty engine coolant heater B control module
- Faulty engine coolant heater B control sensor
- Defective engine coolant heater B coolant temperature switch
How to diagnose & fix
Work through it in order
- Engine overheating
- Loss of coolant
- Check engine light illuminating
- Poor engine performance
- Increased fuel consumption
Read & clear P01EE yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.