We bought an L with trailer prep, and than purchased the hitch and harness we had the dealer install it all when we hooked it up to our horse trailer it told us to check connection and light out. We also got the yellow trailer warning symbol. The running lights will not work. But that horse trailer works with our other truck, and our L works fine with 4 other horse trailers at our barn. Our trailer has old lights and the rest have LED. So, we had Jeep look at it again and they said they fixed it, but they didn't. We also tried to hook it up tonight to a small older hybrid travel trailer and received the same problems. Any suggestions?
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Dealer has no idea? Common theme. If the warning light comes on slowing down, it indicates a possible defective ground as the trailer is trying to ground through the hitch ball. Check for all wires intact and operating on another vehicle. Then pull the 4/7 pin harness out and add another ground wire to the harness and ground it to the frame or solid metal under there.
JeepCares
Well-known member
We're sorry to hear you're running into some concerns, bclarke. Our team here recommends that you return to the dealership for additional diagnosis at your earliest convenience if you continue to have concerns. Our team would be happy to provide an additional layer of assistance if needed, just let us know when your appointment is set for.
Kate
Jeep Cares
Thanks for your reply.. unfortunately I have been to the dealer - twice, two different dealers. They can’t replicate the issue as they aren’t pulling a trailer over a distance. What do you suggest I tell them to check?
They have no idea - 2 dealers. Having used several trailers it has to be on the TV side. Will check the ground … great advice!
Hi… I am not very mechanical so I have an odd question. Until I find a long term solution, would adding a ground wire from the trailer frame to the TV harness (using alligator clip on the frame maybe) work?
BerettaBri
Well-known member
Same issue here with my trailer. I have a factory tow package. I stopped into a dealer service center a few days ago and the service manager had no idea what the issue may be. I asked if by chance there may be any sort of a software update, but he was not aware of that either. It really is a very irritating warning on my cluster, telling you that you have a light out on the trailer. Everything shrinks down, there is an audible "ding"... it is disarming every time. But it happens upon braking, as others have indicated above.
Hey guys, I wanted to give my 2cents on a possible issue and fix. I had this same issue come up while towing with my old range rover and what I found to be the problem was the LED lights on my newer trailer did not produce enough voltage resistance causing the same "check trailer light". I wound up adding a resistor in line on the trailer side of the harness to bump up the resistance, which seemed to solve the problem. I am not sure if this fix would work on the GCL's but I am now curious if I will have this issue once I hook up a trailer
BerettaBri
Well-known member
Hey BH - Is there a particular resister you used that increased the resistance? I get the issue on a boat trailer, utility trailer AND on a simple 4 plug test light.
Kevinc2011
Member
I have that same issue with my 21 Summit Reserve L, Dealer unable to find anything wrong. It has been in the shop for 2 weeks now for steering issues detailed in this other thread.
JeepCares
Well-known member
Hi there. We'd be happy to provide you some support with this. Please send a private message with more details to get started.
Kate
Jeep Cares
bullymadison
Member
Same problem- 2022 GC Hemi. Now is it happening with now trailer ! Back to the dealer ☹️
bullymadison
Member
* with NO trailer.