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Discussion Starter · #1 ·
I have a strange issue going on. Today I noticed the brake lights on my 2017 JKUR are constantly on with the ignition, both tail lights as well as the CHMSL. When I apply the brakes the CHMSL gets brighter but the two tail lights stay the same. When ignition is off, lights are off. When I press brake pedal with ignition off, lights work normally. I checked for obvious shorts in the tail lights and CHMSL and found nothing unusual. I checked codes and pulled U0103 and U0121. These are Lost Connection to Gearshift Module and Lost Connection to Anti-lock Brake Module, respectively. Trailer hitch 4-pin wiring appears to bee intact and mounted to frame away from muffler, so no obvious shorts there. Not sure where to go from here. Any suggestions are greatly appreciated.

Thanks to all!
 
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