P0279 moderate

Injector Circuit High - Cylinder 6

The P0279 code means the vehicle's onboard diagnostic system has detected: Injector Circuit High - Cylinder 6. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
hard
Estimated cost
$150 - $600 (parts and labor)
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Common Symptoms

  • Check Engine Light on
  • Cylinder 6 misfire (no fuel delivery)
  • Rough idle and reduced power
  • Lean misfire symptoms

Probable Causes (Ranked by Likelihood)

  • Open circuit in cylinder 6 injector wiring Very High
  • Failed cylinder 6 injector (open coil) High
  • Disconnected or loose injector connector Moderate
  • PCM driver circuit open Low

Step-by-Step Diagnostic Procedure

  1. Measure cylinder 6 injector resistance. Infinite ohms confirms open coil.

  2. Check injector connector is fully seated.

  3. Test wiring continuity from PCM to injector connector.

  4. Swap injector with adjacent cylinder to confirm.

Frequently Asked Questions

What does circuit high mean for an injector?

Circuit high means no current flows through the injector, typically from an open coil inside the injector or a broken wire.

Will the engine run with a dead cylinder 6 injector?

The engine will run but with a misfire on cylinder 6, rough idle, reduced power, and potential catalytic converter damage from unburned fuel or lean exhaust.

Can a fuel injector coil burn out?

Yes, injector coils can fail open from age, heat, or voltage spikes. GDI injectors are more prone to failure due to higher operating pressures.

Sources

This page is built from documented references. Verify against your own service info before repair work.

P0279 on Diesel, EV & Equipment

The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:

Power Stroke serious Cylinder 7 Injector Circuit Low

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