Injector Circuit - Cylinder 7
The P0280 code means the vehicle's onboard diagnostic system has detected: Injector Circuit - Cylinder 7. 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 7
- Rough running especially at idle
- Reduced power output
Probable Causes (Ranked by Likelihood)
- Faulty fuel injector on cylinder 7 Very High
- Damaged wiring to cylinder 7 injector High
- Corroded or loose injector connector Moderate
- PCM injector driver failure Low
Step-by-Step Diagnostic Procedure
-
Check for misfire code P0307 along with P0280.
-
Measure cylinder 7 injector resistance and compare to spec.
-
Inspect connector for damage or corrosion.
-
Swap injector with adjacent cylinder to isolate the fault.
Frequently Asked Questions
Where is cylinder 7?
Cylinder 7 is found on V8 engines. Its location varies: on GM V8s it is on the driver side, on Ford V8s it is on the passenger side. Check your engine's firing order diagram.
Is P0280 common on V8 engines?
Yes, injector circuit codes on cylinders 7-8 occur on V8 engines. The injectors and wiring are identical to lower-numbered cylinders.
Can I drive with a cylinder 7 misfire?
You can drive short distances, but a continuous misfire can damage the catalytic converter and decrease engine life.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0280 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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