SEAL-FACE 4853788 - Caterpillar

Which Generate This Code:The Electronic Control Module (ECM) detects excessive fuel rail pressure. The ECM detects the following faults:
The ECM detects fuel rail pressure that is more than the pressure that is required for the operating conditions.
Diagnostic code 0262-03 5 Volt Sensor DC Power Supply voltage above normal is not active.
Diagnostic code 0262-04 5 Volt Sensor DC Power Supply voltage below normal is not active.
Diagnostic code 1797-03 Fuel Rail Pressure Sensor voltage above normal is not active.
Diagnostic code 1797-04 Fuel Rail Pressure Sensor voltage below normal is not active.
No diagnostic codes are active for the fuel rail pump.
No diagnostic codes are active for the fuel injectors.System Response:If equipped, the warning lamp will come on and the event code will be logged.E396-1The engine will be derated until the keyswitch is turned to OFF.Test Step 1. The event code does not indicate a fault with the electronic system. This event indicates high fuel pressure. Refer to Systems Operation, Testing and Adjusting, "Fuel System - Inspect".A failed relief valve, the fuel pump or an electronic unit injector may cause an event code to be logged.Results:
OK - STOP