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TuningBot DTC Database · v4.37.15

P21E6 Cylinder 6 Injector B Circuit Low

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainFuelOBD2

What P21E6 means

P21E6
Cylinder 6 Injector B Circuit Low Generic · fuel Data confidence 65%

The control module detected that the signal in the Cylinder 6 Injector B circuit stayed below the expected operating range.

Symptoms

  • MIL illuminated
  • Possible rough running or misfire
  • Possible increased fuel consumption

Possible causes

  • Injector electrical or mechanical fault
  • Wiring or connector fault
  • Fuel supply fault
  • Air leak causing mixture deviation

Recommended checks

  • Read fuel trim / mixture adaptation values
  • Check injector circuits and compare cylinder balance
  • Check fuel pressure
  • Inspect for intake or exhaust leaks

Related and nearby codes

How to read P21E6

P

Powertrain: engine, transmission and driveline systems.

2

Generic SAE-standard code: same meaning on every make.

1E6

Specific fault index within the subsystem.

Frequently asked questions about P21E6

What does P21E6 mean?

Cylinder 6 Injector B Circuit Low. The control module detected that the signal in the Cylinder 6 Injector B circuit stayed below the expected operating range.

Is P21E6 generic or manufacturer-specific?

P21E6 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P21E6 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

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