Whip

I am still struggling trying to diagnose a problem with my trailer brake controller. My post is long, but I'm hoping someone with more knowledge than me might be able to deduce what is going on. I have read about the issues with 2024 trucks when connected to a trailer with solar. That sure sounds similar to what I've been experiencing, but doesn't seem like it applies to older trucks. So I'm starting this thread from scratch. Very sporadically while towing an RV I get the message "Check trailer wiring" followed immediately by "Trailer brakes connected". Sometimes it doesn't happen for a copulation hundred miles, and then will happen repeatedly ten times in a row before stopping again. Twice I've gotten a message saying "Service trailer brake system". When this battlements I lose the trailer brakes entirely and find that the fuse for the trailer brakes is blown. I replace the fuse and everything works again for awhile. I towed a different trailer that did not have trailer brakes and with that one I got the "Check trailer wiring" message and found that I had lost the rear running lights and side marker lights. After unplugging, reconnecting and restarting the truck they were back on. I have replaced the trailer brake controller located above the spare tire and also the trailer connector plug in on the truck. My truck is a 2021 GMC Sierra 2500 HD. I'm at a loss on what to try next or how to diagnose this. Any help is appreciated!

I ended up going with the diesel 3 years ago. No regrets so far - it goes like a champ and I never worry about regen.

So there is no way with factory equipment to know that is in regen? What you are saying about driving it until it finishes the cycle makes sense to me, but if GM doesn't put an indicator in the truck they must not think it is very important? If it needed to happen once every 750 miles I suppose it wouldn't be the worse thing in the world, But I just know it would always happen at an inopportune time when I don't want to take the additional time to drive around for an extra half hour. Is that really what all owners of the newer diesels do? Is there a way to manually put it into regen at a time when it is convenient? I recently bought a used tractor instead of a new one primarily so that I could avoid the new regenerating exhaust systems on the new tractors. The requirements are brand new on tractors, and I didn't like the idea of testing new technology for them. I guess I was hoping that the diesel truck requirements have been in place long enough to have the bugs worked out.

We will be looking at trucks within the next year or so. I'm thinking of moving up to a 3/4 ton truck for better for capacity. I started another thread with questions on the 6.0, but have a diesel question here. With the new emissions equipment on the diesel trucks I am wondering if they would even be feasible for my style of use. We tow approx. 25% of the time. But the other 75% of the time the truck is used more or less as a daily driver. I've read that in order for regeneration to occur properly the truck needs to be driven at highway speeds in order to get the operating temps up. One comment mentioned needing to run 40 miles or so a couple of times a week in order for things to work as designed. My normal use might not see 40 mile trips for a couple of months at a time. When I tow, it tends to be long distances. And we do take long trips 5 or 6 times each year. But when I'm at home my average trip is 10 miles round trip to town and back. It's not that often that I run more than 20-25 miles before stopping. Buti drive it pretty much daily, and might easily put on 2-3,000 miles of shorter trips before hitting the road again. Will using a truck the way I have been cause problems down the road with the regeneration systems? From what I've read, repairs can be extremely expensive. I sure don't want to have to go drive around for an hour a couple of times a week just to work through regeneration cycles.