Injector Circuit - Cylinder 6
The P0277 code means the vehicle's onboard diagnostic system has detected: Injector Circuit - Cylinder 6. This is a moderate severity code.
- 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
- Engine misfire on cylinder 6
- Rough idle
- Reduced engine power
Probable Causes (Ranked by Likelihood)
- Faulty fuel injector on cylinder 6 Very High
- Damaged wiring to cylinder 6 injector High
- Poor electrical connection at injector connector Moderate
- PCM injector driver circuit failure Low
Step-by-Step Diagnostic Procedure
-
Check for misfire codes (P0306) along with P0277.
-
Measure cylinder 6 injector resistance: most are 11-17 ohms for port injection, 1-3 ohms for GDI.
-
Inspect injector connector for damage, corrosion, or fuel contamination.
-
Swap cylinder 6 injector with an adjacent cylinder. If the code follows, the injector is faulty.
Frequently Asked Questions
What is a cylinder 6 injector circuit code?
P0277 indicates a general electrical problem with the fuel injector circuit for cylinder 6. The PCM cannot properly control fuel delivery to that cylinder.
Can I swap injectors to test?
Yes, swapping the cylinder 6 injector with another cylinder is an effective diagnostic method. If the misfire moves, the injector is faulty.
Is cylinder 6 always on the same side?
No, cylinder 6 location varies by engine layout. On V6 engines it is typically on Bank 2. On inline-6 engines it is the last cylinder.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0277 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:
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