Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P011A:00ECT sensor No.1/No.2 performance problem
P011A:00ECT SENSOR NO.1/NO.2 PERFORMANCE PROBLEM
P011A:00ECT SENSOR NO.1/NO.2 PERFORMANCE PROBLEM THIS IS CAUSED BY ERROR DETECTION LOGIC OF THE PCM
Manufacturer communications
7Original wording in English
MAZDA
Some customers may complain about poor heater performance even after the engine reaches normal operating temperature. This may be caused by a plugged heater core. For 2014-2016 Mazda6 and 2013-2016 (US spec) / 2017 (Mexico spec) CX-5, the CHECK ENGINE light may turn on with DTC P011A:00 (ECT sensor No.1/No.2 performance problem)…
MAZDA
Some customers may complain about poor heater performance even after the engine reaches normal operating temperature. This may be caused by a clogged heater unit. For Mazda6 and CX-5, the check engine light may illuminate with the DTC P011A:00 stored at the same time. P011A:00 ECT sensor No.1/No.2 performance problem. NOTE: Refe…
MAZDA
If you encounter a 2013-2016 CX-5 with DTC P011A with overheating and/or no heat from the heater, compare the heater performance to another CX-5. If another CX-5 is not available, check the heater core flow and if restricted, drain/replace coolant and replace the heater core. NOTE: If the code is set by itself, without overheati…
MAZDA
IF YOU ENCOUNTER A 2013-2016 CX-5 WITH DTC P011A WITH OVERHEATING AND/OR NO HEAT FROM THE HEATER, COMPARE THE HEATER PERFORMANCE TO ANOTHER CX-5. IF ANOTHER CX-5 IS NOT AVAILABLE, CHECK THE HEATER CORE FLOW AND IF RESTRICTED, DRAIN/REPLACE COOLANT AND REPLACE THE HEATER CORE. NOTE: IF THE CODE IS SET BY ITSELF, WITHOUT OVERHEATI…
Check vehicle applicability
44A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Chevrolet | EXPRESS ↗ | 2008 |
| Chevrolet | EXPRESS ↗ | 2007 |
| Chevrolet | KODIAK ↗ | 2008 |
| Chevrolet | KODIAK ↗ | 2007 |
| Chevrolet | SILVERADO ↗ | 2008 |
| Chevrolet | SILVERADO ↗ | 2007 |
| GMC | SAVANA ↗ | 2008 |
| GMC | SAVANA ↗ | 2007 |
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.