P01DD: Cylinder 10 Injection Timing Performance - Over Retarded

What it means

The control module monitors injection timing performance for cylinder 10. 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 checks the injection timing performance for cylinder 10 against the expected injector response. This code sets when cylinder 10's injection event is later than the allowed range, which can indicate an injector or injection-control problem.

Common causes

Most likely first.

1. Injector or injection control fault

How to diagnose it

1. Record freeze-frame conditions and inspect cylinder 10 timing or injector data to confirm when the over-retarded event occurs.
2. Check the cylinder 10 injector and connector for looseness, corrosion, physical damage, or fuel leakage.
3. Use scan-tool cylinder contribution or injector tests to compare cylinder 10's response with the other cylinders.
4. Test cylinder 10 injector wiring and control signals for opens, shorts, and poor connections according to the manufacturer's procedure.
5. If the circuit is sound, test the injector and fuel delivery against the manufacturer's specification.

Common fixes

• Repair a poor cylinder 10 injector connection or damaged wiring.
• Correct any verified fuel delivery problem.
• Clean or replace a sticking or faulty cylinder 10 injector.
• Repair the cylinder 10 injector control circuit if the tests identify a driver or wiring fault.

Can I keep driving?

A steady warning light and smooth running generally allow a short, gentle drive for diagnosis; avoid towing and hard acceleration. Stop if it begins running roughly or loses power, because prolonged poor combustion can increase emissions and damage exhaust components.