P0277
Cylinder 6 Injector A Circuit High
Fuel injection — cylinder 6
Generic OBD-II
High
What it means
P0277 means the ECM detected a high-voltage condition — usually an open or a short-to-power — in the cylinder 6 fuel injector control circuit. This is an electrical fault in the injector wiring or coil rather than a fuel-pressure issue, and it typically causes a misfire and rough running on that single cylinder.
High
Can I keep driving? Drivable but not ideal — cylinder 6 may misfire, causing rough running and reduced power. Prolonged misfiring can damage the catalytic converter, so repair it soon.
Common symptoms
What you'll notice
- Check-engine light on
- Rough idle or misfire on cylinder 6
- Reduced power and hesitation
- Possible increased fuel consumption or fuel smell
Common causes
Most likely first
- Open or short-to-voltage in the cylinder 6 injector control wiringLikely
- Corroded or loose injector connectorCommon
- Failed injector solenoid (open/high-resistance coil)Common
- Chafed wiring contacting a power sourceLess often
- Faulty ECM injector driver (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the cylinder 6 injector connector and wiring for an open or short-to-voltage.
- Measure the injector coil resistance and compare with the other injectors.
- Check the control circuit for continuity and correct voltage.
- Replace the injector if its coil is out of spec, or repair the wiring fault.
- Clear the code and confirm the misfire and code stay gone on a road test.
FAQ
Quick answers
Is it safe to drive with P0277?+
Short-term yes, but the affected cylinder can misfire, and sustained misfiring can overheat and damage the catalytic converter. Fix it promptly.
Can I just clear P0277?+
It returns quickly if the injector circuit fault is still there. Repair the wiring or injector first.
Related codes
Often seen with P0277
Read & clear P0277 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX