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, AUTOMATIC TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 256 ((TRANSMISSION CONTROL MODULE (TCM) - ELECTRICAL DIAGNOSTICS))DTC TROUBLESHOOTINGU1512-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM SCMDIAGNOSTIC TEST
2013 Jeep Wrangler Sport, Automatic Trans
Diagnostic Test
2013 Jeep Wrangler Sport, Automatic TransSECTION Diagnostic Test
WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FOR TIPM CAN BUS DTCS
- With the scan tool, read TIPM DTCs.
Are there any TIPM CAN BUS DTCs present?
Yes
- Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure. Perform the diagnostic procedure for DTC U0001-CAN C BUS first if it is present.
- Perform TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Go To 2
- With the scan tool, read TIPM DTCs.
- ELECTRONIC SHIFT MODULE DTCS PRESENT
- With the scan tool, read Steering Control Module (SCM) DTCs.
Are there any SCM DTCs present?
Yes
- Refer to DTC-Based Diagnostics and perform the appropriate diagnostic procedure. Refer to the DTC INDEX article.
- Perform TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Using the schematics as a guide, check the Transmission Control Module (TCM) 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. Refer to MODULE, TRANSMISSION CONTROL .
- Perform TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- With the scan tool, read Steering Control Module (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.