Advice for looking for problems with wiring harness #4 transmission over temp wiring Jump to Latest 41 views 4 replies 4 participants last post by iwantedahorse Feb 8, 2026. If you're experiencing random electrical codes and suspect a wiring harness issue in your Jeep, be cautious about immediately replacing the harness. One user spent $4,000 on a new wiring harness, only to find it wasn't the problem. The actual fix was replacing the PCM (Powertrain Control Module). Consider checking the PCM and other simpler components before committing to a costly harness.
This makes sense as the extra load on the Alternator caused it to crank output a bit..Again, more clues for later.. So the parts changers at the dealer somehow concluded that a front wiring harness was to blame, then it was a whole new front sway bar disconnect that "Should fix the issue". Ok, more clues for my wasted time.. Check the rear wire harness grounds behind the spare tire. Failure of the tailgate wire harness is common. . owns 2000 Jeep XJ Cherokee Classic "We the people are the rightful masters of both Congress and the Courts, not to overthrow the Constitution but to overthrow the men who would pervert the Constitution" Abraham Lincoln, 1859.