P02F3: injector 6 current-fall timing in the 25OBDG04B monitor

The cited 25OBDG04B entry uses P02F3 for injector 6's end-of-injection current decay. It measures the interval from the hold or bypass current to zero and checks both excessively short and excessively long fall times.

Use the correct implementation

For this particular row, failure means below 7 microseconds or above 24 microseconds. Forty-one failed samples among 82, evaluated once per engine cycle, meet the documented filter. These numbers describe this source's monitor and must not be treated as a universal P02F3 definition for every controller.

The source says an injector fault or ECU fault can make the decay period abnormal. That leaves the physical cause unresolved; the code identifies the measured behavior rather than selecting a replacement component.

Two distinctions worth preserving

First determine which side of the timing window failed. Second establish that the evaluated pulse was valid: an injection request must exist and hardware must not report a dropped pulse. Battery voltage must exceed 11 V, and specified circuit, controller, boost-voltage and pull-in faults inhibit monitoring.

A retest performed while those inhibiting faults remain active cannot establish that current decay has recovered. Confirmation should use the applicable service method to assess eligible cylinder-6 events. This article deliberately confines its numeric criteria to 25OBDG04B; another calibration's monitor may implement the same code differently.

Source and applicability

2025 GM 25OBDG04B diagnostic parameter tables; the cited monitor only. Vehicle, engine and calibration applicability must be confirmed separately. These tables describe detection logic, not a complete repair procedure or a component replacement verdict. gm-2025-04b, PDF page 1175.