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 MANUALSJEEP2009PATRIOT LIMITED, EDG, AUTOMATIC CVTREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSHANDS FEED MODULE (HFM) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGU0019-CAN B BUSDIAGNOSTIC TEST

2009 Jeep Patriot Limited, EDG, Automatic CVT

Diagnostic Test

2009 Jeep Patriot Limited, EDG, Automatic CVTSECTION Diagnostic Test

CHECK FOR ACTIVE DTCS
1. With the scan tool, read the active DTCs.
2. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
3. With the scan tool, read the active DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 2
  No
  - If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
CHECK THE TOTALLY INTEGRATED POWER MODULE DTCs
1. With the scan tool, read the Totally Integrated Power Module active DTCs.
  Does the scan tool display any CAN B BUS DTCs - ACTIVE?
  
  Yes
  - Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing
  No
  - Go to step 3
(D55) CAN B BUS (+) CIRCUIT OPEN

Fig 1: CHECKING CAN B BUS (+) CIRCUIT FOR OPEN
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the negative battery cable.
3. Disconnect the Hands Free Module harness connector.
4. Disconnect the Totally Integrated Power Module harness connector.
5. Measure the resistance of the (D55) CAN B Bus (+) circuit between the Totally Integrated Power Module connector and the Hands Free Module connector.
  Is the resistance below 2.0 ohms?
  
  Yes
  - Go to step 4
  No
  - Repair the (D55) CAN B Bus (+) circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
(D54) CAN B BUS (-) CIRCUIT OPEN

Fig 2: CHECKING CAN B BUS (-) CIRCUIT FOR OPEN
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (D54) CAN B Bus (-) circuit between the Totally Integrated Power Module connector and the Hands Free Module connector.
  Is the resistance below 2.0 ohms?
  
  Yes
  - Replace the Hands Free Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  No
  - Repair the (D54) CAN B Bus (-) circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure

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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.