P0280
Cylinder 7 Injector A Circuit High
Fuel injection
Generic OBD-II
High
What it means
P0280 means the ECM sees high voltage (an open or high resistance) in cylinder 7's injector control circuit. When the injector can't fire properly, cylinder 7 misfires and the engine runs rough and down on power. This is an electrical fault in one injector's wiring, connector, or coil — not a fuel-pressure problem — so the engine still starts, just unevenly.
High
Can I keep driving? Usually drivable but rough — cylinder 7 may misfire and lose power. Prolonged misfiring can damage the converter, so don't put off the repair.
Common symptoms
What you'll notice
- Check-engine light on
- Misfire or rough running from cylinder 7
- Rough idle
- Reduced power and hesitation
Common causes
Most likely first
- Open or high-resistance wiring in the cylinder 7 injector circuitLikely
- Loose or corroded injector connectorCommon
- Failed cylinder 7 injector (open coil)Common
- Faulty ECM injector driver (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the fault is on cylinder 7's injector circuit.
- Inspect the injector connector and wiring for opens, corrosion, or backed-out pins.
- Measure the injector coil resistance and compare with the other injectors.
- Check for the driver signal at the ECM connector; repair the open in the circuit.
- Replace the injector if its coil is open with good wiring; suspect the ECM driver last.
FAQ
Quick answers
Is it safe to drive with P0280?+
Briefly — but a dead or misfiring cylinder 7 dumps raw fuel into the exhaust and can overheat the catalytic converter. Repair it promptly.
Can I just clear P0280?+
It comes back as soon as the ECM commands the injector and sees the circuit still open. The wiring or injector must be fixed.
Related codes
Often seen with P0280
Read & clear P0280 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