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 MANUALSJEEP2014WRANGLER UNLIMITED RUBICON, AUTOMATIC TRANSREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANS(TRANSMISSION CONTROL MODULE (TCM) - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGU0429-IMPLAUSIBLE DATA RECEIVED FROM STEERING CONTROL MODULEDIAGNOSTIC TEST
2014 Jeep Wrangler Unlimited Rubicon, Automatic Trans
Diagnostic Test
2014 Jeep Wrangler Unlimited Rubicon, Automatic TransSECTION Diagnostic Test
- CHECK IF TIPM CAN BUS DTCS
- With the scan tool, read TIPM DTCs.
Are there any TIPM CAN bus DTCs present?
Yes
- Refer to the DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Go to .
- With the scan tool, read TIPM DTCs.
- CHECK IF SCM DTCS ARE PRESENT
- With the scan tool, read SCM DTCs.
Are there any SCM DTCS present?
Yes
- Refer to the SCM - DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Using the schematics as a guide, check the Transmission Control Module (TCM) connectors and terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM in accordance with the Service Information.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- With the scan tool, read SCM 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.