Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
1AB
Specific fault index within the subsystem.
Frequently asked questions about P21AB
What does P21AB mean?
Reductant Level Sensor B Circuit High. The control module detected that the signal in the Reductant Level Sensor B circuit stayed above the expected operating range.
Is P21AB generic or manufacturer-specific?
P21AB is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P21AB 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.
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