Vehicle presented after a roadside no-start event. The engine would crank but would not start. Preliminary checks indicated insufficient fuel rail pressure to allow starting.

The engine was confirmed to be cranking normally but unable to start due to zero fuel rail pressure. Diagnostic trouble code P062D – Injector #1 Driver Performance (Stability Fault) was stored and would return instantly after clearing. Multiple electrical, fuel, and mechanical systems were checked, and replacement of the high-pressure fuel components did not initially resolve the issue. Further investigation revealed a power supply issue to the EDU relay as the root cause of the non-start condition.