The control module detected that the signal in the Auxiliary Transmission Fluid Pump Phase U - V - W circuit stayed below the expected operating range.
TuningBot DTC Database · v4.37.14
P0C21 Auxiliary Transmission Fluid Pump Phase U - V - W Circuit Low
Generic (OBD-II) interpretation in the TuningBot DTC database.
What P0C21 means
Related and nearby codes
How to read P0C21
Powertrain: engine, transmission and driveline systems.
Generic SAE-standard code: same meaning on every make.
Specific fault index within the subsystem.
Frequently asked questions about P0C21
What does P0C21 mean?
Auxiliary Transmission Fluid Pump Phase U - V - W Circuit Low. The control module detected that the signal in the Auxiliary Transmission Fluid Pump Phase U - V - W circuit stayed below the expected operating range.
Is P0C21 generic or manufacturer-specific?
P0C21 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P0C21 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. 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
