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HOMESERVICE MANUALSDODGE AND RAM2005MAGNUM R/T, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTACCESSORIES CONTROL SYSTEMSOVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGU0019-CAN B BUSDIAGNOSTIC TEST
2005 Dodge and Ram Magnum R/T, AWD

Diagnostic Test

2005 Dodge and Ram Magnum R/T, AWDSECTION Diagnostic Test
  1. 1)  CHECK FOR ACTIVE DTC U0019-CAN B BUS 
    Fig 1: SCAN TOOL (STARSCAN)
    GC0010242Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition on.

    With the scan tool, record and erase any Electronic Overhead Module DTCs.

    Turn the ignition off, wait 30 seconds then turn the ignition on.

    With the scan tool, read DTCs.

    Is DTC U0019-CAN B BUS active? 

    Yes 

    1. Go To step  2).

    No 

    1. The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
    2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .
  2. 2)  CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE 

    With the scan tool, read Front Control Module DTCs

    Does the scan tool display any active CAN B BUS related DTCs? 

    Yes 

    1. Diagnose and repair the DTC(s). (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)

    No 

    1. Go to step  3).
  3. 3)  CHECK (D55) CAN B BUS (+) CIRCUIT FOR AN OPEN 
    Fig 2: Checking Electronic Overhead Module CAN B BUS (+) Circuit
    GC0016221Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the negative battery cable.

    Disconnect the Electronic Overhead Module harness connector.

    Disconnect the Front Control Module C1 harness connector.

    Measure the resistance of the (D55) Can B Bus (+) circuit between the Front Control Module C1 harness connector and the Electronic Overhead Module harness connector.

    Is the resistance below 2.0 ohms? 

    Yes 

    1. Go To step  4).

    No 

    1. Repair the Can B Bus (+) circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .
  4. 4)  CHECK THE (D54) CAN B BUS (-) CIRCUIT FOR AN OPEN 
    Fig 3: Checking Electronic Overhead Module CAN B BUS (+) Circuit
    GC0016222Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (D54) Can B Bus (-) circuit between the Front Control Module C1 harness connector and the Electronic Overhead Module harness connector.

    Is the resistance below 2.0 ohms? 

    Yes 

    1. Replace the Electronic Overhead Module. Refer to OVERHEAD CONSOLE - SERVICE INFORMATION .
    2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .

    No 

    1. Repair the Can B Bus (-) circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 . (Refer to BODY VERIFICATION TEST - VER 1) .
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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.