P011E code meaning
Engine Coolant Temperature 1 / Ambient Air Temperature Correlation
Powertrain system Generic code P01xx codes Check engine light
What P011E means
After a long standstill, typically six to eight hours, the coolant should have cooled to roughly the outside air temperature measured by the ambient sensor in the bumper or mirror. P011E compares coolant temperature sensor 1 with the ambient sensor at start-up and is set when they differ beyond a calibrated limit and no preheater was detected. The code does not say which of the two sensors is wrong. No manufacturer document using exactly this code was found; the description rests on the CARB requirement for coolant sensor plausibility and on the same cold-soak comparison that Ford (reported as P0071), GM/Saab and Mazda perform under other codes.
P011E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P011E
- Check engine light on
- Usually no driving symptoms
- Outside temperature display possibly wrong
Common causes of P011E
- PossibleCoolant temperature sensor 1 drifting
- PossibleAmbient temperature sensor drifting or affected by engine heat or sun
- PossiblePreheater not detected
- Less likelyContact resistance in one sensor's connector or wiring
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine coolant temperature sensorAmbient air temperature sensorSensor wiring
What each part of P011E means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1 | Area: fuel and air metering. |
| 1E | The exact fault in that area. |
What to do next
- Note P011E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P011E
What does P011E mean?
P011E means "Engine Coolant Temperature 1 / Ambient Air Temperature Correlation". After a long standstill, typically six to eight hours, the coolant should have cooled to roughly the outside air temperature measured by the ambient sensor in the bumper or mirror. It is a generic code, so it means the same on every make.
Is it safe to drive with P011E?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P011E fail an emissions test?
Yes, it can. P011E is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P011E to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P011E clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.