P01E8

Engine Coolant Heater A Control Circuit/Open

Moderate severity

Engine Coolant Heater A Control Circuit/Open: the control circuit is open. Likely a broken wire, disconnected connector, or failed actuator.

Common causes

Wiring break
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $90-660
Pin pushed back out of connector body
Less common, but worth ruling out after the more likely causes.
low
Typical part cost: $90-660
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P01E8.
Unlock causes
Free forever · No credit card

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.

Get the full step-by-step diagnosis

Create a free Wrenchify account to unlock the rest for P01E8.

Unlock diagnosis

Free forever · No credit card

Related codes

See related trouble codes

Create a free Wrenchify account to unlock the rest for P01E8.

Unlock related codes

Free forever · No credit card

Frequently asked questions

What does P01E8 mean?

P01E8 means "Engine Coolant Heater A Control Circuit/Open". It is a generic OBD-II code that points to a fault in the fuel & air metering.

What are the most common causes of P01E8?

wiring break; pin pushed back out of connector body; cracked solder joint inside the module or sensor — 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.

Get the full P01E8 diagnosis for your vehicle

Year, make, model + step-by-step repair help — free plan included.

Diagnose P01E8