Trailering Problems

[BigBlue_22]

Hey Guys,
Seeing if I can get some thoughts on a trailering issue I have.
I have a ATV trailer that hooks up no problem to my 2005 suburban and 2013
Savana van.
However when I went to plug the trailer into my 2022 Silverado zr2 the running lights didn’t work and the right brake light and turn signal was out. I replaced the four flat harness with no avail. Please let me know if you guys have any recommendations.

 

[AXE]

You can test the function of your trailer wire connection with a test light. There are videos on YouTube and some other diagrams showing how the leads function. Probably worth a trip to the dealer.

I've got a lot of undiagnosed trailer connection problems with my 24 2500HD ZR2. I've posted about them. Still not fixed. Dealer said it checks out on their trailer simulator, but I don't think that replicates a real world situation. I also know it's not the trailers as they work fine on other trucks.

My problem is likely with truck software or possibly the brake controller. I towed my boat without electric brakes and it didn't throw any codes.

Brake controller was a problem on some trucks. I think 8ball_99 had his replaced.

 

[BigBlue_22]

Thanks AXE
There was a bulletin on the 2019+ trucks for the trailer integration module so I will talk to my Chevy dealer.

 

[AXE]

Thanks AXE
There was a bulletin on the 2019+ trucks for the trailer integration module so I will talk to my Chevy dealer.

Yeah. I gotta do something different. I have my truck in another state towing and the local dealer said they would charge me if they couldn't find the problem........ I'm like WTF?

 

[XkenX]

Hey Guys,
Seeing if I can get some thoughts on a trailering issue I have.
I have a ATV trailer that hooks up no problem to my 2005 suburban and 2013
Savana van.
However when I went to plug the trailer into my 2022 Silverado zr2 the running lights didn’t work and the right brake light and turn signal was out. I replaced the four flat harness with no avail. Please let me know if you guys have any recommendations.

I had the same issue with boat at first and got new 14 dollar rv to flat pin with light up trouble lights. Everything went away. My old plugs where clean and dont know why they wouldnt work on new truck.

 

[8ball_99]

Maybe try a different 4way to 7 pin adapter? The only issues I know of are related to the brake controller. Since you said you changed the 4 way harness, I'm assuming the trailer doesn't have brakes. I'm also guessing you made sure the grounds are good on the trailer since you changed the wiring.

You can pickup a 7 way tester for about 12 bucks. They come in handy. Would be an easy way to test the trucks plug.

 

[AXE]

I've ran 6 different plugs. Only two that work don't have brakes. Probably try to get them to replace brake controller and reprogram BCM.

 

[jruck]

I also have a trailer issue. 2025 ZR2 with a 4 flat to 7 blade adapter to run my 4 flat plug. Never had an issue before. Run the light test, everything checks out ok. Halfway to the boat ramp yesterday the left blinker goes into hyperdrive at the pace and screen says check left lamp. Turn the truck off and back on. It resets get another mile down the road, go to make a left turn and again hyperspeed with errors saying to check left lamp. Go to U-Haul today, they check with a 7 pin tester truck side. Everything is normal. When no trailer is connected everything works fine, with trailer connected after changing adapters right back to error codes.

 

[AXE]

There's a recall on trailer brake module. My 2500HD did a lot of wacky shit and then suddenly decided to work correctly. I ended up having the recall done anyway. Lots of quirky software in these rigs.

 

[jruck]

There's a recall on trailer brake module. My 2500HD did a lot of wacky shit and then suddenly decided to work correctly. I ended up having the recall done anyway. Lots of quirky software in these rigs.

I don’t have brakes on my boat trailer. Does just having that module mess it up?

 

[AXE]

I don’t have brakes on my boat trailer. Does just having that module mess it up?

I think it can because it connects through the harness, but may just be software. The dealer has a trailer simulator they test with. They couldn't find my issue. Might have to tow your trailer in.

 

[jruck]

I think it can because it connects through the harness, but may just be software. The dealer has a trailer simulator they test with. They couldn't find my issue. Might have to tow your trailer in.

if I end up having to go to the dealer I’ll do that. Today when I towed my boat to the shop (separate issue) i used the accessory/no trailer function and everything worked just fine. When I get it back I’ll probably set it up again to see how it tows as a setup profile. Weird how the software can make something go from easy to complicated.