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P2CEF
Auxiliary Thermostat A Stuck Open
Generic · thermal_management
Data confidence
65%
The control module determined that the Auxiliary Thermostat A did not change state as commanded and appears stuck.
TuningBot DTC Database · v4.37.15
P2CEF Auxiliary Thermostat A Stuck Open
Generic (OBD-II) interpretation in the TuningBot DTC database.
What P2CEF means
Related and nearby codes
How to read P2CEF
P
Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
CEF
Specific fault index within the subsystem.
Frequently asked questions about P2CEF
What does P2CEF mean?
Auxiliary Thermostat A Stuck Open. The control module determined that the Auxiliary Thermostat A did not change state as commanded and appears stuck.
Is P2CEF generic or manufacturer-specific?
P2CEF is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P2CEF at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Other file services
Understand the system behind this code: Diagnostic Strategy and DTC Logic