PACCAR MX (2004 Emissions) Fault Code: U1901 CAN – Message (DPFC2) Rate Too High from Aftertreatment System

PACCAR MX (2004 Emissions) Fault Code: U1901 CAN – Message (DPFC2) Rate Too High from Aftertreatment System

SET CONDITIONS:
This DTC is set when the repetition rate of the received CAN message is higher than expected.

DIAGNOSTIC CONDITION:
The diagnostic runs continuously when the ignition is keyed on.

RESET CONDITION:
The DTC changes to inactive after the diagnostic runs and passes.

POSSIBLE CAUSES:
1. ECU software mismatch
2. Defective components