Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
1E4
Specific fault index within the subsystem.
Frequently asked questions about P21E4
What does P21E4 mean?
Cylinder 5 Injector B Circuit Low. The control module detected that the signal in the Cylinder 5 Injector B circuit stayed below the expected operating range.
Is P21E4 generic or manufacturer-specific?
P21E4 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P21E4 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.
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