Similar issue with my truck - Started over a year ago. I had a Diamond Kote applied at the dealer when I purchased the truck as it came with a 10 year frame warranty - I noticed the Diamond Cote Peeling off down to bare metal - After numerous calls and e-mails to the dealer one of the servie advisors slipped up and mentioned the TSB to me - I then approached the Manager regarding the TSB and he told me they were working on a solution.
It took the dealer over a year to "build" an area to complete the work as it required harsh chemicals for peeling the wax coating off the frame. In the meantime he offered a temporary re-spray of the undercoating which I accepted to prevent any further corrosion during the winter salt months. Unfortunately they sprayed this directly over the road dirt and rust that had already accumulated.
Originally I was told the process would take 5-7 days as the frame had to be removed from the vehicle. To my surprise when the dealer contacted me to book it in they told me it would only take 2 days. I asked if they were still taking the frame out and they told me no - the TSB just required them to scrape the frame, treat it and re-apply a coating. I was hesitant but allowed them to complete the service.
When I went to pick up the truck I was shocked at the "quality" of the repair. They had only applied the diamond kote back over all of the rust and dirt and as far as I could tell did not do any prep work to the frame. What was worse is the entire top of the frame was untouched. not cleaned. not treated and not even covered in the Diamond Kote.
These pictures were taken on the dealers lot the day they finished their repair process:
After I took the photos I went in to speak the manager who said I would need to leave the truck with them so they can take the bed and cab off to complete the repair properly. I then got news from him that they spoke with GM rep who only authorized them to repeat the process again however this time authorized an additional 3 hours to do it properly.
I was furious at this point and told him that there is no way to fix the frame properly without removing it and even then it is a gamble as the rust inside the frame and between the mounted accessories such as body mounts would not be touched and eventually bleed through the new coating...
They are now removing the cab and box to attempt the repair.
As of now I have zero faith this repair will last more than a year and as we have no lemon laws in Canada I am documenting the entire process and will be pursuing legal action when the rust comes through again.
Anyone else have this much trouble dealing with these guys? Or see such a hack job repair?