P0203: Injector Circuit/Open — Cylinder 3
System: Fuel injection · Priority: high
What P0203 means
The control module detected a condition matching the generic definition Injector Circuit/Open — Cylinder 3. A trouble code identifies what the module detected; it does not automatically identify the failed part.
Useful next checks
- Inspect cylinder 3 injector connector and wiring.
- Check injector resistance against service specifications.
- Use bidirectional or current-ramp testing when available before replacing the injector.
Why vehicle context matters
The same generic code can have different diagnostic paths depending on engine, calibration, wiring layout, service bulletins and related codes. Freeze-frame and live data can help establish when the fault occurred.
Need a scanner for P0203?
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