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Home >> Dodge and Ram >> 2024 >> ProMaster 2500 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Body Control Module (BCM) - DTCS U1750-86 To U191A-86) >> DTC Troubleshooting >> U1804-08 Lin 4 - Bus Signal/Message Failures >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2024 RAM ProMaster EV. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
LIN BUS 4 CIRCUIT SHORTED TO VOLTAGE
LIN BUS 4 CIRCUIT SHORTED TO GROUND
RIGHT STEERING WHEEL SWITCH (SPEED CONTROL SWITCH)
STEERING WHEEL SENSE MODULE (SWSM)
CLOCKSPRING
BODY CONTROL MODULE (BCM)

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