P011A
Engine Coolant Temperature Sensor 1/2 Correlation
ECT sensors 1 and 2 readings disagree beyond plausible limits — typically near startup both should match within tolerance.
ECT sensors 1 and 2 readings disagree beyond plausible limits — typically near startup both should match within tolerance.
Common causes
- high
One sensor drifted
One of the most commonly reported causes for this code — check this first.
Typical part cost: $40-280
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P011A.
Unlock causesFree 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 P011A.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P011A.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does P011A mean?
P011A means "Engine Coolant Temperature Sensor 1/2 Correlation". It is a generic OBD-II code that points to a fault in the fuel & air metering.
What are the most common causes of P011A?
one sensor drifted — 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 P011A diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.