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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control Module (BCM) - DTCS U170-86 To U1935-8F >> DTC Troubleshooting >> U1804-08-Lin 4 - Bus Signal/Message Failures >> Possible Causes

Possible Causes

Possible Causes
LIN BUS 4 CIRCUIT SHORTED TO VOLTAGE
LIN BUS 4 CIRCUIT SHORTED TO GROUND
SPEED CONTROL SWITCH
STEERING WHEEL SENSE MODULE (SWSM)
BODY CONTROL MODULE (BCM)

Perform the COMMUNICATION DIAGNOSTIC PROCEDURE. Refer to COMMUNICATION DIAGNOSTIC PROCEDURE .