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P2CF1
Auxiliary Thermostat B Stuck Open
Generic · thermal_management
Data confidence
65%
The control module determined that the Auxiliary Thermostat B did not change state as commanded and appears stuck.
TuningBot DTC Database · v4.37.15
P2CF1 Auxiliary Thermostat B Stuck Open
Generic (OBD-II) interpretation in the TuningBot DTC database.
What P2CF1 means
Related and nearby codes
How to read P2CF1
P
Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
CF1
Specific fault index within the subsystem.
Frequently asked questions about P2CF1
What does P2CF1 mean?
Auxiliary Thermostat B Stuck Open. The control module determined that the Auxiliary Thermostat B did not change state as commanded and appears stuck.
Is P2CF1 generic or manufacturer-specific?
P2CF1 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P2CF1 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