P0291 Code: Cylinder 11 Fuel Injector Circuit Low
🟠 Moderate severity · drivable
Drivable, but cylinder 11 may misfire and the engine can run rough. Have it checked soon.
What P0291 means
The fuel injector circuit for cylinder 11 is reading lower voltage than the computer expects. That usually means the circuit is open or shorted to ground, so the computer cannot control fuel delivery to that cylinder correctly.
Symptoms
- Check engine light on
- Rough idle or misfire
- Loss of power
- Poor fuel economy
Common causes
- most common: Open or shorted wiring in the cylinder 11 injector circuit
- common: Faulty fuel injector on cylinder 11
- common: Loose or corroded injector connector
- rare: Injector driver fault inside the engine computer
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Inspect and clean the cylinder 11 injector connector | Yes | $0–10 |
| Repair open or shorted injector wiring | Mechanic | $50–200 |
| Replace the cylinder 11 fuel injector | Mechanic | $100–300 |
Frequently asked questions
Can I drive with P0291?
Yes, but cylinder 11 may misfire and the engine can run rough. Fix it soon to avoid damaging the catalytic converter.
What causes a P0291 code?
Usually a wiring problem in the cylinder 11 injector circuit, or a faulty injector.
How much does it cost to fix P0291?
Typically $100–$300 for a new injector, or less if it is just a wiring or connector repair.
Related codes
P0292
P0292 Code: Cylinder 11 Fuel Injector Circuit High
P0293P0293 Code: Cylinder 11 Fuel Injector Contribution/Balance
P0311P0311 Code: Cylinder 11 Misfire Detected
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.