P0204 (generic)
Generic Powertrain — Fuel & Air Metering — Injector Circuit
System: Powertrain · Fuel & Air Metering — Injector Circuit
Severity: moderate · Inspection: often fails
Description
Fuel injector circuit or injection timing fault. Check the indicated injector, its driver circuit, and fuel pressure.
Diagnostic snapshot P0204
- Difficulty
- 6/10 — Intermediate diagnostics
- Est. repair cost
- $120 – $450 (parts + typical shop labor)
- Common symptoms
- Check engine light (MIL)
- Rough idle
- Misfire or hesitation under load
Diagnostic workflow
- Confirm P0204 with a live scan — note pending vs stored and freeze frame data.
- Verify reported symptoms: Check engine light (MIL), Rough idle, Misfire or hesitation under load.
- Inspect wiring/connectors and related sensors before replacing modules.
- Most likely fixes: Fuel injector / circuit testing (noid light, resistance, swap); Cylinder-specific misfire diagnosis (swap / compression / injector).
- Clear codes and road-test; re-scan after two drive cycles if the monitor must set.
Topics
- OBD-II and scan tools (guide)
- Powertrain DTCs (P-prefix) (system)
Related symptoms
- Check engine light (MIL) (weight 0.800)
- Rough idle (weight 0.720)
- Misfire or hesitation under load (weight 0.680)
Common fixes (curated)
- Fuel injector / circuit testing (noid light, resistance, swap) (rank 1)
- Cylinder-specific misfire diagnosis (swap / compression / injector) (rank 2)
Related articles
None published for this code yet.
Diagnostic bundle (JSON)
Machine-readable graph: related codes, symptoms, fixes, topics, articles, and curated sources rows. Append &external=1 for optional YouTube / Google CSE hits when API keys are configured (see web/.env.example).