P0280 — Cylinder 7 Injector Circuit Low
Drive with caution — fix soon.
What P0280 means
This code means the engine computer detected low voltage in the electrical circuit for the cylinder 7 fuel injector. It usually points to a wiring problem, a corroded connector, or a failing injector on that cylinder. It's a circuit-level fault that's typically fixable by repairing wiring or replacing the injector, without major engine work.
Common symptoms
- Check engine light is on
- Rough idle or slight engine shaking
- Hesitation or loss of power on acceleration
- Engine misfire on cylinder 7
- Possible hard starting
Common causes
- Damaged or corroded wiring to the cylinder 7 injector
- Loose or faulty injector electrical connector
- Failing fuel injector on cylinder 7
- Short to ground in the injector circuit
- Problem with the injector driver in the engine computer
Typical repair cost
$120 – $600
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0280 code?
Usually yes for short trips, but don't ignore it. The affected cylinder may not be fueling correctly, which causes rough running and can harm the catalytic converter over time. Get it diagnosed soon.
How much does it cost to fix a P0280 code?
A wiring or connector repair can be as low as $120, while replacing the cylinder 7 injector typically runs $300 to $600 depending on the vehicle. A proper diagnosis pins down which it is.
Is a P0280 code serious?
It's moderate. The car will often still run, but a misfueling cylinder means lost performance and possible converter damage if left alone. It's worth fixing promptly but rarely an emergency.
What does injector circuit low mean for cylinder 7?
It means the computer sent a command to the cylinder 7 injector but measured lower-than-expected voltage in that circuit. That usually points to a wiring fault, a bad connector, or an injector that isn't responding properly.