P01DF: Cylinder 11 Injection Timing Performance - Over Retarded

What it means

The control module monitors injection timing performance for cylinder 11. It sets this code when injection timing is more retarded than the allowed 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 for cylinder 11 and checks whether the injector responds within the expected timing range. This code sets when cylinder 11's injection event is later than allowed, suggesting an injector or injection-control fault.

Common causes

Most likely first.

1. Injector or injection control fault

How to diagnose it

1. Capture freeze-frame data and review cylinder 11 timing or injector readings to identify the conditions linked to the over-retarded event.
2. Inspect the cylinder 11 injector connector and harness for damage, corrosion, loose fit, or fuel leakage.
3. Compare cylinder 11 contribution or injector response with the other cylinders using scan-tool data.
4. Test the cylinder 11 injector wiring and control circuit for opens, shorts, or poor connections following the manufacturer's procedure.
5. If wiring checks pass, evaluate the injector and its fuel delivery against the manufacturer's specification.

Common fixes

• Repair a damaged or loose cylinder 11 injector connector or harness.
• Correct a verified fuel delivery problem.
• Clean or replace a sticking or defective cylinder 11 injector.
• Repair the cylinder 11 injector driver or control circuit if testing confirms a fault.

Can I keep driving?

With a steady warning light and smooth engine operation, keep any necessary drive gentle and short, and avoid towing or hard acceleration. Stop if rough running or power loss occurs, because continued poor combustion can raise emissions and damage exhaust components.