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 MANUALSJEEP2013WRANGLER SPORT, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLANTILOCK BRAKE SYSTEM (ABS) - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGC1239-EMISSION ROLLS TEST ACTIVEDIAGNOSTIC TEST

2013 Jeep Wrangler Sport, Standard Trans

Diagnostic Test

2013 Jeep Wrangler Sport, Standard TransSECTION Diagnostic Test

VERIFY THE DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool record and erase the DTCs.
3. Turn the ignition off.
4. Turn the ignition on.
5. Using the scan tool, read the DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go To 2
  No
  - Perform the ABS-INTERMITTENT CONDITION TEST. Refer to STANDARD PROCEDURE .
EMISSION ROLLS TEST ENABLED
1. Turn the ignition on.
2. Using the scan tool, under "Miscellaneous Functions" DISABLE the Emission Rolls Test in the TIPM.
3. With the scan tool, erase the DTCs.
4. Turn the ignition off and wait ten seconds.
5. Turn the ignition on.
6. Using the scan tool, the read DTCs in ABS.
  Does the DTC remain active?
  
  Yes
  - Go To 3
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.
ANTI-LOCK BRAKE SYSTEM (ABS) MODULE
1. Turn the ignition off.
2. Replace the Anti-lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
3. Turn the ignition on.
4. Using the scan tool, read DTCs in the ABS.
  Is the DTC still remain active?
  
  Yes
  - Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information. Refer to REMOVAL .
  No
  - Test complete.

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.