PACCAR MX (2004 Emissions) Fault Code: P1483 EGR Valve Module – CAN Communication Error

PACCAR MX (2004 Emissions) Fault Code: P1483 EGR Valve Module – CAN Communication Error

SET CONDITIONS:
The EGR valve module (L095) detects that the cyclic CAN command message transmitted by the PCI ECU (D420) has been missing for more than 7.5 seconds.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive as soon as the fault is no longer detected.

REPAIR VERIFICATION:
1. Clear all DTCs.
2. Test drive or operate the vehicle to meet the diagnostic conditions and set conditions.
3. Did the DTC come back?
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
CAN wiring

ADDITIONAL INFORMATION:
1. The EGR valve module (L095) is controlled by a cyclic CAN command message transmitted by the PCI ECU (D420) in which the operating mode and the target position are requested.
2. There is still CAN communication between the EGR valve module and PCI ECU with this fault active.
3. The actuator motor is switched off and the EGR valve is fully closed (0% position) with this fault active.
4. Engine torque is reduced after 10 hours of engine operation.