Magoomba

Picked up the truck from the dealer today and whoa, baby! My smooth-as-butter ride is back. They were reasonably kind to me on the pricing, too. At least from the $3k starting point. On my service slip, they charged me $1000 for the shocks, but they heavily discounted the rest of the work I had them do at the same time (75k service and a few odds and ends) to make up for some of it. Let's hope I get at least another 75k miles out of this set.

Is there an aftermarket option that offers as nice of a ride quality as the OEM Mag Ride shocks? That's what sold me on the Denali. I tested other models that had Z71 package and non-Z. I found the non-Z better, but the Denali was way smoother for all of the highway mileage I drive. For those that have been following, my shocks arrived at my dealer this afternoon. They hoped to finish it before they closed today, but called me to say the installation of the fronts was far more complicated than the plug-and-play installation of the rears. I'll have it back tomorrow.

Sorry, I meant are there any aftermarket options to use as replacement shocks? I plan to put a couple hundred thousand miles on this truck and I'm guessing GMC won't step in to help me pay for them next time.

I appreciate this suggestion and I've asked my dealer. My service rep is pleading my case to the manager.

Really??? That's pretty disappointing to hear. I had no idea these shocks had such a bad rap. I guess I was naive thinking they were new tech on the 2015 Denali. Is there any better solution via aftermarket?

Searched the forum back about a year and didn't see any posts on this topic. Here's my situation: 2015 Denali, 75k miles, purchased new 10/2014. Truck has been reasonably trouble free, other than an issue with the OnStar antenna in Jan. 2015. About 2 months ago, I noticed the front end was starting to feel a little bouncy and making a creaking noise on slow speed bumps and figured I'd mention it when my 75k mile service came up. Scheduled my appointment for said 75k service for a week out and 2 days later I notice the rear of my truck is not level. Looking at the back of the truck, the passenger side was lower than the driver side. A tape measure confirmed the top of tire to wheel well measurement was 3.5" lower on the passenger side. Brought it to the dealership right away because I didn't feel it was safe to drive it like that. My dealer informs me that not only the rear passenger shock, but ALL FOUR of my Magnetic Ride Control (MRC) shocks are bad and need to be replaced, at a cost of $3,000 for the set. Mind you, I've had a very good relationship with this dealer, so it didn't take much effort to get them to attempt to warranty this for me. They said GMC would cover them via a pro-rated warranty where they pay $2k and I pay $1k. I'm not happy, but I need my truck back so I gave the dealer the go-ahead. Two days later, my dealer tells me the shocks are out of stock and none are available from any other GMC dealers anywhere in the US. There is no date on the backorder from GMC, either. Why would all 4 of my expensive shocks fail on my expensive truck within 75k miles and none are available anywhere within the GMC USA network? Well, I'm no Sherlock Holmes, but it leads me to believe there's a problem with these shocks and GM has burned through their inventory replacing them. Further, my 75k miles is almost all highway miles. About the only "off road" adventures it has seen is when I inadvertently drive over my lawn. Certainly nothing like the great off-road driving clips in GMC Truck ads. Anyone aware of any similar issues? Thanks in advance.

It was over 6 weeks for my module to arrive. When I called OnStar to reactivate and told them what happened, and that I missed nearly two months of my free trial, they extended it by 2 months, no questions asked. However, I've still not been able to reactivate my 4G wifi. The OnStar tech said that a different tech would be calling me within the next few days to reset it. Haven't had that call yet...

Finally got my module in and took it to the dealer for replacement. Only took them a couple of hours to do the repair, along with my 4WD transfer case issue repair (see the recent Service 4WD thread) and it's been working fine all afternoon and evening. Here's what the service order reads: "Corrected by Communication Interface Module Replacement; Check for OnStar not connecting; Had DTC S BIOIB 3C and F0; Found PIT5236B to control unit hardware internal failure; Call GM TAC case # 71-1420837058; Ordered communication interface module; replaced and programmed and setup" The service manager said he would contact OnStar to make sure I get 2 months added on to my trial.

My 2015 Sierra Denali got stuck in Auto 4WD this past weekend. At some point, it shifted itself back to 2WD and remained there until I brought it to the dealer today. The service form says "Corrected by Transfer Case Shift Control Module; Reprogramming with SPS; Checked for TCCM DTC S CO393 and CO38D; Found PIP5220B to reprogram TCCM; Reprogrammed TCCM and setup" Since picking it up from the dealer, I've started, driven, parked 3 times, all leaving it in Auto mode since there's snow on the roads here. So far (knock wood...) it's been fine.

I've not noticed any leaks in my 2015.

Anyone have any luck getting this fixed yet? My dealer is telling me the part is still on backorder. Supposedly they're checking with GM daily and there's no ETA on the part's availability.

9/14. It was below freezing when mine went out.

Does anyone else find this odd that we all seemed to develop this problem right around the same time? Found out the module is on backorder and my dealer has no idea when it will be available...

This is how mine started. Went out for a bit, came back, then went out for good.