Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSDODGE AND RAM2023PROMASTER 3500 2D CAB CHASSISREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESBODY CONTROL MODULE (BCM) - COMMUNICATION DIAGNOSTIC PROCEDURE & VERIFICATION TESTSTANDARD PROCEDURECOMMUNICATION DIAGNOSTIC PROCEDURE
2023 Dodge and Ram ProMaster 3500 2D Cab Chassis
Communication Diagnostic Procedure
2023 Dodge and Ram ProMaster 3500 2D Cab ChassisSECTION Communication Diagnostic Procedure
- CHECK FOR POSSIBLE CAUSES
- This Communication Diagnostic Procedure is intended to provide the technician with a common starting point.NOTE:
For an in-depth explanation of the Controller Area Network (CAN) Bus system operation, refer to COMMUNICATION, DESCRIPTION and COMMUNICATION, OPERATION .
- This Communication Diagnostic Procedure is intended to provide the technician with a common starting point.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.