I have a 2014 Jeep Wrangler Sport Unlimited RH drive, I have been having a lot of issues with it, I have replaced Both camshaft sensors and crank shaft sensor, Powersteering pump, harmonic balancer, serpentine belt and AC Compressor and took it for a test drive and it went into limp mode all lights came on check engine, ABS, Traction, ETC light and PRND all flashing on cluster and it's throwing a lot of U codes on the PCM and TCM and BCM on my Topdon Scanner, I will check the wiring and grounds later, possibly might be a TIPM issue?
14 Wrangler Sport Unlimited U codes
- Thread starter Hamboned1
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The symptoms you’re describing, especially with the multiple U codes and limp mode activation, could indeed point towards a communication issue within the vehicle’s electronic systems. Since you've replaced several key components, it’s good that you’re considering wiring and ground connections next, as these can often cause erratic behavior in the Jeep's electronics.
A few things to check:
Wiring and Grounding: Thoroughly inspect the wiring harnesses for any signs of wear, corrosion, or damage, especially around the connectors related to the TCM, PCM, and BCM. Ensure that all grounds are clean and secured.
TIPM: It’s possible that the Totally Integrated Power Module (TIPM) could be malfunctioning, especially if it’s causing multiple modules to throw U codes. If you suspect this might be the case, examining any visual signs of damage or testing the TIPM itself might be worthwhile.
Battery Voltage: Make sure your battery voltage is within a good range (around 12.4 volts or more) and that your alternator is functioning properly. Low voltage can cause various electronic gremlins.
Codes: You need to tell us what specific codes it's throwing. Use your scanner to do so. Without specific codes we can't be of much help.
Fuse Check: Don’t forget to check all relevant fuses in the fuse box—sometimes, a blown fuse can lead to bizarre electrical problems across multiple systems.
Hopefully, this helps point you in the right direction! Keep us updated on your progress, and good luck diagnosing the issue!
Give Mark at Wranglerfix a shout. He can help you and his team can work wonders with JK's too.
I checked all fuses only 1 20 amp fuse was blowed it was a tail light/ trailer light fuse but i went ahead and replaced it, I checked all ground connections on body and engine block, being sure they was tight and used a wire brush on the one on block and battery connections are good and voltage is good at 12.8 , im doing a ecm reset on it now and see if that helps
I have attached all the U codes im getting from the pcm, I did a ecm reset bu disconnecting negative terminal for about 30 min and used a jumper cable from negative disconnected to positive cable and it cleared it up for about 10 min after running then all the U codes came back on , I believe TIPM might be the culprit U0141?
It sounds like you're on the right track with your diagnosis, and the fact that the codes cleared temporarily is a good indication that there might be a communication issue, likely related to the TIPM as you speculated. The U0141 code indicates that there is a loss of communication with the PCM, which can often point towards an issue with the TIPM or the wiring between the TIPM and the affected modules.
Since you’ve already done a thorough check of your grounds and fuses, here are a few more suggestions:
- Make sure the connectors to the TIPM are clean and secure. Any corrosion or poor connection can cause communication issues.
- Check the wiring harness that runs between the TIPM and the PCM for any signs of damage or wear that might cause intermittent communication failures.
- Besides the U0141, look for other codes that might provide clues about what's going on. Sometimes, codes can be related or point to a specific failure elsewhere in the system.
- If you have access to a test tool, you might want to test the TIPM itself or consider bringing it to a professional if you suspect it has failed.
- Sometimes there are service bulletins or recalls related to electrical issues in specific model years. It might be worth checking the dealership for any information on that.
Keep us updated on your progress! Good luck, and I hope you can get to the bottom of this soon!