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Any information on how we can upgrade our OnStar equipment? For many of us with 2015 or older trucks... Our auto crash response and other features goes away in December. So far I've not been able to get any info from On Star or GM on how I can upgrade my receiver to 4G or 5G capabilities. Any thoughts or news? Any 3rd party receivers out there that will plug in to our systems? Thanks. David

Check fuses up front. Check frame rail connections in front of rear bumper.

I routinely pull a 3ton rv trailer. I also overland with tent on rack above truck bed. I wanted a tire that was the best compromise for the above. Chose the BF Goodrich KO2 tires. They are best rated for snow, mud, sand and weather. They ride well on interstate at 75mph. Mileage is down about 2 mpgs from previous Michelins. They can easily handle the trailer load. Expensive, but worth it. Been two years now and showing negligible wear with almost 20k miles on them. I recommend them. 2015 Sierra 1500 Denali. Stock except....Changed tires to: 275x60x20 for towing. Tire diameter was within .25" of stock so speedo is only 1 mph off.

Well looks like the AFM issue got me. At 124k miles, I thought I was beyond the AFM issue...guess not. I got the flashing check engine light, stumbling, etc., But after a few miles... The light stopped flashing and motor was running smooth. Put a load on it and same problem. Took to dealer. It was smooth sitting at idle. Writer was perplexed. They tore down engine. Dealer hasn't said a thing about AFM but they said the rocker was frozen, push rod bent. Cam scored. What else would cause this damage except a locked up lifter? They need to tear down and rebuild. Looking at a week and $10,112.00 parts and labor. 2 year warrantee. No crate engine available. I know that price is high. But now I'm bothered that this won't be the last time I see this issue. Most of my driving is freeway at 75mph. I do tow a 3 ton trailer but learned long ago you go up hills only as fast as you are willing to go down them... So that's 55 to 60... Letting the trannie do the work! In other words, my truck doesn't get abused. Thoughts on this? Questions I should ask as we go along this process? Should I ask for cam, lifter, push rod... back? By the way, GM won't help with price... I've been a loyal GM guy since 2004.... Even to taking my trucks to dealers for service. That did upset me as well! Should I speak to GM Regional about this? Am I now going to be a part of that massive law suit? Sorry for all the questions, I'm retired and not used to these type of issues. Life was much simpler years back...grins! Ideas appreciated! David

Well, sadly...my dealer, Coulter Cadillac in Phoenix refused to cover the issue or even volunteer to help. GM turned me down saying my VIN wasn't included. 2015 Sierra 1500 Denali with 6.2 and 8 speed. I argued that my truck was a 2015 1/2 so probably got the bad part installed just before the 2016's came down the line, but the lady at GM wouldn't budge. Even though my truck was unlucky enough to get the bad part, they didn't care a whit. BTW, I've been having my GMC vehicles serviced at that dealer since 2006. No more. $1250.00 quoted. The dealer even quoted 4.2 hours labor for a 1 hour job. That's what the special coverage calls for...1 hour. Makes sense since you don't have to take off the valve assembly or exhaust; just remove the fluid, drop the pan, drop the filter, unplug the harness...remove 3 screws and drop the harness. Replace above. Takes longer to pump out and replace the fluid than anything else. They wanted to charge me for the sensor as well....even though according to GM, the sensor is part of the harness assembly. I walked away. Sigh. Think I'm done with GM. I'm not happy.... david (only 2016 vehicles on the special coverage)

Understood. If you find a solution, please post here...as I'm in the same boat. Would like to go with non-OEM shocks as I'm not pleased with the reports of low shock life. My 04 Yukon XL with HD trailer package was on original shocks at 219K miles...and I towed a 2 ton sailboat a lot!

http://www.xineering.com/shocksims.html

Can't help you shocks as my 2015 Denali is still cooking (knock on wood). But I do know that somewhere on this forum I read about the resistor bypass kits. If memory serves they were a bit expensive but worth it from the standpoint of being plug and play. If I find that post again, I'll come back here and post.

Last March 2019, I bought my new to me 2015 Sierra Denali with 6.2. 60K miles. It was idling so bad the dealer replaced the engine mounts which didn't solve the problem. I realized the P.O. made many trips to Mexico...and knowing how bad Pemex gas is, I threw in some Techron and started using 91 octane top tier fuel. I also have been running Seafoam as well. Now, after 10K miles and 2 trips towing 6Klb trailer...the premium gas and fuel cleaners have done the job. She starts without that huge shake, runs at idle smoothly with a little stumble now and then... and purrs at speeds. MPG's have gone up as well. Not using any cleaner now...just premium gas. Bottom line? Clean the fuel system. The 6.2 can be silky smooth then...IMHO.

I replaced my 2004 Yukon XL SLT with a 2015 Sierra Denali. I'm a bit concerned about all this talk of the shocks going bad so early. My Yukon XL went 219K miles with only the front wheel bearing assemblies replaced just last year. It has towed my 4200lb sailboat across country and all over since day 1 of it's life. Original Shocks, brakes, etc.. I went with the GMC truck thinking I was getting the same quality. Here's hoping you guys are in the minority as I really don't want to start spending this kind of big bux on an expensive truck. I'm around 64K miles now on the Denali. Crossing fingers!