Code P2673 indicates that the engine control module has detected the diesel injection pump timing calibration procedure was not completed or did not store correctly. The PCM relies on this learned timing data to control precisely when fuel is injected. When the calibration fails, the code sets and engine performance may degrade.
Wear, binding, or failure of the injection pump's internal timing control mechanism or actuator can prevent the calibration from completing successfully.
Damaged, corroded, or loose wiring and connectors between the injection pump and the PCM can interrupt the signals needed for the learn procedure.
Low fuel pressure, contaminated fuel, or a restricted filter can cause erratic pump operation that interferes with timing calibration.
Incorrect or unstable timing reference signals from these sensors can prevent the PCM from successfully learning injection pump timing.
A rare cause is a PCM that cannot store or execute the calibration due to software corruption or internal hardware failure; this should only be considered after mechanical and wiring causes are ruled out.
No. Clearing the code does not perform the calibration; the timing learn procedure must be completed and the underlying cause repaired or the code will likely return.
Yes. The injection pump timing calibration usually requires a professional-level scan tool or factory diagnostic software to run the learn procedure correctly.
Short trips may be possible, but performance, emissions, and starting can worsen. Prolonged driving is not recommended until the calibration is completed and the fault is repaired.
Usually not. PCM failure is uncommon for P2673. The injection pump itself, wiring faults, fuel issues, or sensor problems are far more likely and should be thoroughly checked before replacing the PCM.