Hours: 07–23 daily

TuningBot DTC Database · v4.37.15

P0285 Cylinder 9 Injector Circuit Low

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

P · PowertrainFuelOBD2

What P0285 means

P0285
Cylinder 9 Injector Circuit Low Generic · fuel Data confidence 90%

The control module detected that the signal in the Cylinder 9 Injector circuit stayed below the expected operating range.

Symptoms

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

Possible causes

  • Wiring short to earth
  • injector
  • ECM

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 P0285

P

Powertrain: engine, transmission and driveline systems.

0

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

285

Specific fault index within the subsystem.

Frequently asked questions about P0285

What does P0285 mean?

Cylinder 9 Injector Circuit Low. The control module detected that the signal in the Cylinder 9 Injector circuit stayed below the expected operating range.

Is P0285 generic or manufacturer-specific?

P0285 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P0285 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

ECU tuningDyno-tested results by model and engine See the results →

← Search the full DTC database