What does code P01D1 mean?

Q: What does code P01D1 mean?

Cylinder 4 Injection Timing Performance - Over Retarded. P01D1 indicates that the engine control module has detected the fuel injection timing for cylinder 4 is more retarded than the commanded value during operation. The computer compares the actual injection event timing to the desired timing and sets this code when the deviation exceeds a calibrated threshold, typically due to a mechanical or electrical fault in the cylinder 4 injector circuit or the injector itself.

DTC codes / P01xx · Fuel and air metering / P01D1

P01D1Cylinder 4 Injection Timing Performance - Over Retarded

P01D1 indicates that the engine control module has detected the fuel injection timing for cylinder 4 is more retarded than the commanded value during operation. The computer compares the actual injection event timing to the desired timing and sets this code when the deviation exceeds a calibrated threshold, typically due to a mechanical or electrical fault in the cylinder 4 injector circuit or the injector itself.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.