P2CEF: The additional thermostat A stays open and does not close
The additional thermostat A stays open and does not close. It is usually dirt, wear or the motor that moves it.
| Code | P2CEF |
|---|---|
| System | Engine and transmission |
| Group | P2Cxx, Engine, emissions and electrification |
| Type | Generic: it means the same on every make |
How to read and clear P2CEF with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2CEF with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2CE5 Particulate filter pressure sensor C has an electrical fault
- P2CE6 Particulate filter pressure sensor C gives readings that do not match the rest
- P2CEA Particulate filter pressure sensor D has an electrical fault
- P2CEB Particulate filter pressure sensor D gives readings that do not match the rest
- P2CF0 The additional thermostat A stays closed and does not open
- P2CF1 The additional thermostat B stays open and does not close
- P2CF2 The additional thermostat B stays closed and does not open
- P2CF3 The traction battery water pump A is turning slower than it should
What does code P2CEF mean?
The additional thermostat A stays open and does not close. It is usually dirt, wear or the motor that moves it.
How do you clear P2CEF?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2CEF comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
