P01EF
Engine Coolant Heater B Control Circuit Performance
Engine Coolant Heater B Control Circuit Performance: the control circuit has an electrical fault.
Engine Coolant Heater B Control Circuit Performance: the control circuit has an electrical fault.
Common causes
- high
Heater element failed
One of the most commonly reported causes for this code — check this first.
Typical part cost: $90-880
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P01EF mean?
P01EF means "Engine Coolant Heater B Control Circuit Performance". It is a generic OBD-II code that points to a fault in the fuel & air metering.
What are the most common causes of P01EF?
heater element failed — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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