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PACCAR MX (2004 Emissions) Fault Code: U1812 CAN – Message (EAS_SYS_INFO) Time-Out from Aftertreatment System

PACCAR MX (2004 Emissions) Fault Code: U1812 CAN – Message (EAS_SYS_INFO) 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.

CORRESPONDING OBD READINESS MONITOR:
None

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

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

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PACCAR MX (2004 Emissions) Fault Code: U1806 CAN Communication – Message (ACM_to_Eng) Out of Range, Soot Level from Aftertreatment System
PACCAR MX (2004 Emissions) Fault Code: U1805 CAN – Message (ACC2) Time-Out from Vehicle Control System
PACCAR MX (2004 Emissions) Fault Code: U1803 CAN Communication – Message (ACC1) Out of Range, Forward Collision Warning from Advanced Emergency Braking System
PACCAR MX (2004 Emissions) Fault Code: U1802 VTG Turbocharger Actuator Power Supply – Data Valid but Too High
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