What it means
Injection timing performance for cylinder 9 is more advanced than the expected range.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The engine control module monitors injection timing performance specifically for cylinder 9. This code sets when cylinder 9's injection event is detected earlier than the allowed range, potentially because the injector, its wiring or driver, or fuel delivery is affecting response.
Common causes
Most likely first.
- Injector wear, sticking, or restricted flow
- Fault in cylinder 9 injector wiring or connector
- Injector driver or control circuit fault
- Fuel pressure or delivery problem affecting injector response
Symptoms
- Check engine light on
- Rough idle or vibration
- Reduced power or uneven acceleration
- Increased fuel consumption
How to diagnose it
- Save freeze-frame data and check cylinder 9 injector or timing data to see when its event went over advanced.
- Inspect the cylinder 9 injector connector and wiring for corrosion, loose fit, chafing, heat damage, or leakage.
- Compare cylinder 9 injector contribution and response with the other cylinders using available scan-tool tests.
- Test the cylinder 9 injector circuit for opens, shorts, and poor connections using the manufacturer's procedure.
- If the circuit passes, evaluate injector condition and fuel pressure or delivery against the manufacturer's specification.
Common fixes
- Repair the cylinder 9 injector connector or wiring if damaged or loose.
- Restore fuel delivery if pressure or supply fails the manufacturer's specification.
- Clean or replace a sticking or restricted cylinder 9 injector.
- Repair the injector driver or control circuit if testing confirms a fault.
Can I keep driving?
If the engine runs normally and the warning light is steady, keep driving to a minimum and avoid high loads. Stop if the engine misfires, runs roughly, or the warning light flashes, since continued incorrect fueling can damage emissions equipment.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.