OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P011A?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOne sensor drifted
Symptoms
- Check engine light on
- Cooling fan runs constantly or not at all
- Cabin heater weak or excessively hot
- Possible long warm-up time or hard cold start
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Ect Sensor 1, Ect Sensor 2
Related codes
- P0117Engine Coolant Temperature Sensor Low Input
- P0118Engine Coolant Temperature Sensor High Input
- P0119Engine Coolant Temperature Sensor Circuit Intermittent
- P011BEngine Coolant Temperature/Intake Air Temperature Correlation
- P011CCharge Air Cooler Temperature/Intake Air Temperature Correlation Bank 1
- P011DCharge Air Cooler Temperature/Intake Air Temperature Correlation Bank 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.