P0279 — Cylinder 6 Contribution/Balance Fault
Drivable short-term, but fix now to avoid damage.
What P0279 means
This code means cylinder 6 is contributing less power than the other cylinders, so the engine's computer flags it as out of balance. It usually points to a weak or clogged fuel injector, low compression, or an ignition problem on that cylinder. It's a fairly common diesel and gas code, and once the root cause is found it's often fixable without major engine work.
Common symptoms
- Check engine light is on
- Rough idle or noticeable engine shaking
- Loss of power or sluggish acceleration
- Engine vibration that you can feel through the seat or wheel
- Slightly higher fuel consumption
Common causes
- Weak, clogged, or failing fuel injector on cylinder 6
- Low compression in cylinder 6 (worn rings or valves)
- Faulty spark plug or ignition coil on that cylinder (gas engines)
- Vacuum leak affecting cylinder 6
- Wiring or connector problems at the injector
Typical repair cost
$150 – $900
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0279 code?
For short trips, usually yes, but you shouldn't rely on it. The engine is running unbalanced, which can worsen and stress other components. If the check engine light is flashing or the car shakes badly, stop driving and get it looked at right away.
How much does it cost to fix a P0279 code?
It depends on the cause. A single fuel injector or ignition coil replacement often runs $150 to $500, while compression-related repairs can climb toward $900 or more. Diagnosis is the first step to know exactly what's needed.
Is a P0279 code serious?
It's moderately to seriously concerning. A cylinder not pulling its weight means lost power and possible misfiring, which over time can damage the catalytic converter. It's best to address it promptly.
What does cylinder 6 balance fault actually mean?
Your engine's computer compares how much each cylinder contributes to keeping the engine spinning. When cylinder 6 lags behind the others, it sets this code. The fix is finding why that one cylinder is weak, often a fuel, compression, or ignition issue.