P0209 — Injector Circuit Malfunction - Cylinder 8
Drivable short-term, but fix now to avoid damage.
What P0209 means
This code means the engine computer found an electrical fault in the wiring or control circuit for the fuel injector on cylinder 8. The usual culprits are a failing injector, damaged wiring or connectors, or a problem in the circuit driving it. Fixing it typically means testing the injector and wiring and replacing whatever part has failed, and it's often resolved without tearing into the engine.
Common symptoms
- Check engine light is on
- Rough idle or noticeable engine shaking
- Engine misfires or hesitates under load
- Loss of power or poor acceleration
- Increased fuel consumption or rough running
Common causes
- Faulty fuel injector on cylinder 8
- Damaged or corroded injector wiring or connector
- Open or short circuit in the injector control wiring
- Failed injector driver in the engine control module
- Poor electrical ground or loose connection
Typical repair cost
$150 – $500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0209 code?
Short trips are usually fine, but it's not something to ignore. A dead or weak cylinder can damage your catalytic converter and leave you stranded, so get it looked at soon. If the engine shakes badly or loses power, stop and have it towed.
How much does it cost to fix a P0209 code?
Expect roughly $150 to $500. Wiring or connector repairs are cheaper, while replacing the cylinder 8 injector with labor lands at the upper end of that range.
Is a P0209 code serious?
It can be serious. The injector circuit fault usually leads to misfires that can damage emissions parts and worsen fuel economy if left alone. It's best to address it promptly.
Will a P0209 code cause my car to fail emissions?
Quite possibly. A misfiring cylinder dumps unburned fuel into the exhaust, which raises emissions and can trip an inspection failure. Fixing the injector usually clears the problem.