P01D3: Cylinder 5 Injection Timing Performance - Over Retarded

What it means

The control module monitors injection timing performance for cylinder 5. 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 control module commands fuel injection for cylinder 5 and monitors whether its injection timing stays within the expected range. This code indicates cylinder 5 injection timing is more retarded than allowed, pointing to an injector or injection-control response that is later than expected.

Common causes

Most likely first.

1. Injector or injection control fault

How to diagnose it

1. Record freeze-frame data and compare cylinder 5 timing-related values with the other cylinders to see when the delayed timing was detected.
2. Inspect the cylinder 5 injector connector and wiring for loose pins, corrosion, chafing, or heat damage.
3. Review live data for cylinder 5 injector command and response, looking for a delayed or inconsistent change relative to other cylinders.
4. Test the cylinder 5 injector control circuit and driver operation according to the manufacturer's procedure and specification.
5. If circuit checks pass, evaluate cylinder 5 injector operation for sticking or abnormal response.

Common fixes

• Reconnect or clean the cylinder 5 injector connector.
• Repair damaged cylinder 5 injector wiring or terminals.
• Repair the injector control circuit or driver if testing confirms a fault.
• Replace the cylinder 5 injector if testing shows that it is sticking or responding too slowly.

Can I keep driving?

If the engine is smooth and the warning light is steady, drive only as needed and avoid heavy loads until it is diagnosed. Stop if rough running, power loss, or a flashing warning light develops, since continued misfiring or poor combustion can cause further damage and raise emissions.