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 TROUBLESHOOTINGU0426-INVALID DATA RECEIVED FROM VEHICLE IMMOBILIZER 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
- CHECK FOR AN ACTIVE DTC
- With the scan tool, read Body Control Module (BCM) DTCs and record on the repair order.
- Record the Environmental Data.
- With the scan tool, erase DTCs.
- Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
- With the scan tool, read BCM DTCs.
Did the DTC return?
Yes
- Go To 2
No
- Test complete. The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- CHECK FOR POWERTRAIN CONTROL MODULE (PCM) DTCS NOTE:
Make sure the Battery is in good condition and perform the Battery diagnostic procedure. Refer to BATTERY, DIAGNOSIS AND TESTING .
RENDER: 1.0x
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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.