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 MANUALSJEEP2009WRANGLER RUBICON, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGU0429-IMPLAUSIBLE DATA RECEIVED FROM SCMDIAGNOSTIC TEST
2009 Jeep Wrangler Rubicon, Standard
Diagnostic Test
2009 Jeep Wrangler Rubicon, StandardSECTION Diagnostic Test
- CHECK IF COMMUNICATION RELATED DTCs ARE PRESENT
- Turn the ignition on.
- With the scan tool, read ABS DTCs.
Are any Communication related DTCs present?
Yes
- Diagnose and repair the DTC(s). Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing .
No
- Go to step 2
- CHECK IF OTHER STEERING ANGLE SENSOR RELATED DTCs ARE PRESENT
- With the scan tool, read ABS DTCs.
Are any other STEERING ANGLE SENSOR DTCs present?
Yes
- Diagnose and repair the DTC(s).
No
- Replace the Clockspring in accordance with the Service Information.
- Perform the ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
- With the scan tool, read ABS DTCs.
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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.