Code result
P01EF
Engine Coolant Heater B Control Circuit Performance
Moderate severity
What it means
Engine Coolant Heater B Control Circuit Performance: the control circuit has an electrical fault.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Heater element failed
highOne of the most commonly reported causes for this code — check this first.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P01EF freeNo credit card required