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How can this not be criminal?… oh… I know…

If you wanted new tires or windshield wipers they would do it. If you want a new engine… they would do it… all for a price. Now, your choice of maintenance is none of their concern if it exceeds the book..

Contact GM. I did lemon law in Texas for another manufacturer.., had to go to arbitration.. but they fixed it.

Not sure… but look up on Allison website. If an “external filter”, DIY… Allison website is easy to navigate.. at least last time I checked. Iur 2017 has 98k miles, 4 transmission external filter changes… cheap insurance… we tow 10k # bumper pull about 1/2 the miles.. 65 and slower.. totally STOCK truck except new shocks, tires, filters and all fluids including the differential and transfer case.4x4… I run Michelin tires on 17”stock wheels. I upgraded at 95k to the Castrol Transynd .. huge diff pin transmission performance. I did NoT “drop the pan”… as the transmission was working flawlessly before…The other lubes are spec. So, dealers make $.. it’s their job… look at the bright side… they did not oversell… and may have filled your “blinker fluid”…

Don’t know.. but, if you touch anything electrical on this truck, be SURE the battery (s) is disconnected…negative first.. usually sufficient… YMMV can you turn them OFF in Settings! Unplug the boards… reconnect battery(s)… if no warning, or error/CEL, tape it properly… monitor for any?errors… do not ignore a problem.

Strange… a resurgence of this problem on other forums… hmm.. OTA updates?? My 2017, only 98k miles… been having these “intermittent” failures… dealer says.. “not broken””… maybe your grille guard… “ I removed it.. seemed to help, put back on, still intermittent.. hmm.. So.. after reseating every connector on body, under hood and in dash, still gives”Service Trailer Braking System”… and it dings and dings… stops then does it again… just driving down the road… when it gives that error and sings, the “Park” button on dash console fails to illuminate or cause change in behavior Of the system. Whatever you do… do NOT jump another vehicle…. Maybe. One t the cables to charge, but do NoT let them try to turn on or start their vehicle. Just sayin…

What condition is truck? Mileage? It is possible you have a bad head gasket? Yes. more likely, in really hot weather the h2O boils off… Also, if new, hoses can expand a bit under pressure.. if this is a 6.6 diesel, the reservoir/coolant overflow is waaaay different and you don’t want to vent unless you are sure of the procedure.

Collision avoidance includes a “seat shaker”… is that what you are feeling?

Have you checked the driveline? Bad ujoint, differential sound? Get it on a lift where you can operate with wheels off the ground… Has mileage changed? All stock? Mileage? Tires balanced? Steering wheel stable? Just noise or feel in the seat/steering wheel? Have you had the steering he led for loose/worn? Pitman is a classic, especially if truck “lifted” or oversized or incorrect tires… I think it’s worth investigating.

Strange… my “parking” alerts always failing. Dealer couldn’t fix… last week started getting the dreaded “Service Trailer Braking System”.. keeps dinging.. the “park” button on console has a light that is supposed to give status on/off… it goes dark after start and the STBS warning. Dealer (same that failed at first, warranty) gave NTF, no trouble found. Told me to bring my trailer and they will diagnose… but it isn’t a TRAILER problem!!! So, gotta fix myself. I have blue driver a long time. Found C1117 set. Cleared… that code has not set again…. I have gone over the truck, reseated everything… except the ECM connectors… did not want to force. All other functions work. i went into Settings and disabled the crash avoidance, etc. will see tomorrow if that stops ther constant barrage. dealer said they can’t test the truck without the trailer… that’s not correct. There is a module to connect to 7way..where trailer plugs .. simulates a trailer.. or at least something connected.. after reseating Every accessible connector in engine compartment, dash and body, verifying no corrosion or damage, cleaning batteries and all cables from it… same error. Bottom line… I think GM got away with not fixing the problem.. anyone know where the module for the Parking sensors is?

A concern with “used” vehicles is you don’t know what happened to it in previous life. some put larger tires, ride hard and off-road, sometimes pushing it hard. This accelerates wear. so.. bite the bullet, realize these pitman, gearbox, are weak points, replace all the moving parts.. ball joints etc. if you run bigger than stock tires, save $ to do this again down the road

Yup. If one is failing… i would change all

nice ..

Maybe he made some $$$$ on the deal…??

You “can” if it meets tow rating… but the computer will not be happy.. don’t drive over 45 until you repair properly