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 DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSIS3.6L - DTCS U0404 TO U140ADTC TROUBLESHOOTINGU0422-IMPLAUSIBLE DATA RECEIVED FROM BODY CONTROL MODULEDIAGNOSTIC TEST
2023 Dodge and Ram ProMaster 3500 2D Cab Chassis
Diagnostic Test
2023 Dodge and Ram ProMaster 3500 2D Cab ChassisSECTION Diagnostic Test
- ACTIVE DTC NOTE:
Diagnose all CAN communication DTCs before continuing.
- Turn the ignition on.
- With a scan tool, view DTCs.
Is the status Active for this DTC?
Yes
- Go To 2
No
- Perform the Stored Lost Communication DTCs diagnostic procedure. Refer to STORED LOST COMMUNICATION DTCS .
- BCM COMMUNICATION RELATED DTCS IN OTHER MODULES
- With a scan tool check for BCM communication related DTCs in other modules on the CAN Bus.
Are there any BCM communication related DTCs in other modules on the CAN Bus at this time?
Yes
- Replace the Body Control Module in accordance with the service information.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
No
- Replace and program the Powertrain Control Module (PCM) in accordance with the service information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL .
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
- With a scan tool check for BCM communication related DTCs in other modules on the CAN Bus.
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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.