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PACCAR MX (2004 Emissions) Fault Code: U1900 CAN – Message (DPFC2) Time-Out from Aftertreatment System

PACCAR MX (2004 Emissions) Fault Code: U1900 CAN – Message (DPFC2) Time-Out from Aftertreatment System

SET CONDITIONS:
This DTC is set when the repetition rate of the received CAN message is lower than expected or when the message is not received at all.

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

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

POSSIBLE CAUSES:
1. Wiring issues (interruption or contact resistance)
2. Defective components
3. Incorrect software configuration

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