jd64

Mine did the exact same thing. It would act up and then be fine for a few weeks.

The dealer replaced both of my headlight assemblies . it took 3 headlights to get a good pair but mine was done when the 24's first came out and they told me there was a problem with them. When they replaced the first set they used 1 original version and 1 new version.The original version still had the problem, so at that time i waited about 6 weeks for a new version replacement. I have since sold the truck but my buddy bought it and i know the front lighting is all fine.

i'am having a very similar issure with the trailer tpms sensors. i have had the same problem on my 2024 and now on my 2025. they will not learn on the trailer manualy or with 3 different tpms tools, even with the license plate off. when i remove the wheels from the trailer and place them at the rear bumper of the truck all 4 learn very quick . checked them twice on the truck screen and temp and psi was fine,within 15 miles they all drop out and never come back. then comes all the annoying trailer tpms messages. deleted the trailer profile and re created a new one and did not set up any tpms sensors. iam still getting the annoying messages,even without any sensors setup??. the trailer is 21' from the bumper to the rear trailer wheel. i think the max lenght gm recomends is 23'. iam using all steel 12 ply tires and was wondering if they could be causing some interference but the last trailer with the 24 truck did the same thing and used std 10ply trailer tires. is there a sgnal booster/repeater that would work with the gm system that anybody knows of. iam even considereing trying a aftermarket system w/ external sensros. anybody have any ideas that i havent tried. i am using the 4T+ gm sensors. also not even considering the dealer they have damaged my truck in the past and i dont want to leave them a truck and trailer.

LIGHTING PROBLEMS FINALLY SOLVED. i have waited so long to post this so that i was as sure as possible everything was working properly since the problems were so intermittent. About 7-8 weeks ago both of my headlights were replaced to fix the turn signal fast flash problem, which it did but the new right side headlight had a new problem. the DRL would flash sometimes when the headlights were on. My dealer opened a TAC case and GM told them to replace the right headlight again. They were on backorder for about 3-4 weeks. 3 weeks ago the new right side came in and 2 weeks ago it was replaced. so far everything is fine with the DRL. i have been dealing with this lighting problem since the first 100 miles on the truck in April. the steering box had a leak and was replaced but no other issues with the truck, it has been EXCELLENT, i hope this lighting information helps some of the other guys out that are having the same problems.

2 new headlights fixed my turn signal issues. it has been about 7-8 weeks now so iam convinced the T/S's are fixed but now my dealer is working on another issue with the new right headlight. when the headlights or parking lights are turned on the right DRL blinks and again this is a intermittent problem just like the T/S's were. The dealer opened a TAC case and under TAC's instruction they updated the lighting module with the latest software but that didn't fix it so TAC said replace the right headlight again. they are on backorder until mid to end of September.. but now the possible strike issue.....so iam waiting for the new light and hoping the T/S's work in that one, along with the DRL. mine was built in flint 3/21/23. vin #110259

Thanks again, ill see what happens Tuesday when i bring it back in. According to the work order the wiring and connectors were checked before they decided to put the new headlights in and i even re-seated both connectors before i even brought it in the first time. the T/S's so far are working fine with the new lights.

you mentioned 4 1500's with the problem ,was it the T/S problem or the DRL problem i'am having now? what did you guys do to fix it? mine is going back in Tuesday.

thanks for the info. i asked to have a TAC case opened for the turn signal problems but i dont think they did as they decided to replace both headlamp assembles. this is the 3rd time back for a headlight issue. it started within the first 100 miles.

Dealership replaced both headlights a little over 2 weeks ago for the fast flash turn signal problems, the turn signals seem to be working ok now but only time will tell since that problem was very intermittent. A few days ago a new headlight problem started with the replacement lights . When the parking lights ,low beams or high beam lights are on the right Daytime Running Light flashes constantly. Turn off the headlights and all is normal. So when i drive the truck at night the right DRL constantly flashes, trying to be patient while waiting for the dealership to decides what they are going to do. I find it hard to believe that these headlight problems didn't show their face while all the GM employees were driving these trucks prior to start of production. Anyone have this problem yet?

yea, i noticed the brake light reflection in the front of my trailer last weekend when the regular cruise was engaged and slowing down going down grades.

but on a good note ,i have 4000 miles on the truck now and 1000 of them with a 10,000 pound enclosed car trailer behind it. the 10 sp is fantastic!!! with the 6.6 gas, the gearing in the trans makes the truck feel like it has a different motor in it. my 20 and 21 with the 6sp were ok and were better the the 6.0/6sp combo for power but nothing like this one. the truck is super comfortable to travel in because of the better towing capabilities. i always by gassers and have had many 2500 hd's over the years and this one even surpasses my favorite and strongest, my 04 with a 8.1 and allison trans. just thought of another intermittent issue. when i'am in tow/haul with the trailer and use the T/S's for changing lanes on the highway sometimes the red blind zone box shows up and sometimes it doesn't. anybody else notice the same thing?? all these little issues really dont get me to worked up, they will get straightened out sooner or later. at least so far it still runs......

another note on the turn signals. a few days back i was setting up a new version of a GM pass through/interface cable on my GDS laptop at work and had some extra time so i thought lets see how much of the lighting system front and rear i can a control. i was able to command every light on and off plenty of times EXCEPT the front T/S's and front DRL's. all the lamps that do not work when the T/S's do their thing. kind a didn't make any sense because everything was working fine from the t/s and lighting switches in the truck at that time. now the tailgate is getting a mind of its own. sometimes it works with the handle button, sometimes it doesn't. same thing from the dash switch. so far the only switch that hasn't crapped out is the tailgate button on the key fob. service power tailgate message on the DIC. no codes stored and it resets just like everything else does once the truck is off for a while and may work fine for weeks

if possible could you let us know what the outcome is, i understand, if its good, you will not know for a while since the t/s problems are so intermittent . my power tailgate has a mind of its own also....

still waiting for GM to come up with a fix. the turn signals have been working intermittently since the first 100 miles in April. my first appointment for this was in May and i have been checking in with the dealer every 2 weeks. i spoke with my dealer again yesterday and they have other trucks doing the same thing with open TAC cases. according to the dealer TAC's next step is a lighting module but they are on back order with no ETA. he said TAC will not approve any further repairs until the lighting module is tried, i thought i have seen other fellas on various sites that have already had the lighting modules replaced with no success? aren't non functioning turn signals a safety issue??? kinda concerns me at times.

when the left one acted up within the first 100 miles i had the wheel liners out for rustproofing so i un plugged the left headlamp connector and made sure the terminals weren't damaged that the secondary lock was indeed originally locked and it was, so i reconnected it and made sure it was locked. it acted up again within a few hundred miles, each side has done it 3 times within the 1200 miles that are on the truck now. when i scanned it there were no codes in either the truck lighting module or in the trailer lighting module and no associated communication codes between the modules stored in the GDS 2.