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 MANUALSJEEP2014CHEROKEE SPORT, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICES(ELECTRIC PARKING BRAKE (EPB) MODULE - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGU0403-00-IMPLAUSIBLE DATA RECEIVED FROM T-CASEDIAGNOSTIC TEST

2014 Jeep Cherokee Sport, AWD

Diagnostic Test

2014 Jeep Cherokee Sport, AWDSECTION Diagnostic Test

VERIFY THE DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Cycle the ignition from off to on.
4. With the scan tool, read DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go To 2
  No
  - Go To 5
CHECK FOR BODY CONTROL MODULE (BCM) DTCS
1. With the scan tool, read BCM DTCs.
  Are there any BCM CAN Bus DTCs present?
  
  Yes
  - Perform the appropriate diagnostic procedure. Refer to the BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX article .
  No
  - Go To 3
CHECK FOR DRIVE TRAIN CONTROL MODULE (DTCM) DTCS
1. With the scan tool, read DTCM DTCs.
  Are there any DTCM DTCs present?
  
  Yes
  - Perform the appropriate diagnostic procedure. Refer to DIAGNOSIS AND TESTING .
  No
  - Go To 4
CHECK OTHER MODULES FOR DTCS
1. With the scan tool, read DTCs.
  Are there any other modules reporting implausible communication DTCs against the DTCM?
  
  Yes
  - Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Refer to MODULE, DRIVETRAIN CONTROL, REMOVAL .
  - Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Using the schematics as a guide, check the EPB module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the Electric Parking Brake (EPB) Module in accordance with the Service Information. Refer to MODULE, ELECTRIC PARK BRAKE, REMOVAL .
  - Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this module. Wiggle the wiring and connectors while checking for shorted and open circuits.
3. Check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
4. Check Service Bulletins for any possible causes that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the EPB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete.

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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.