Table 1 shows one common back over prevention related problems of the 2026 GMC Sierra 1500.
| Problem Category | Number of Problems |
|---|---|
| Warnings problems |
No sound at different times. No way to reset issue. TSB issued may 14, 2026 for known issue. As of July 6, no estimate on repair. Blinkers make no sounds, onstar can call but you cannot hear them. In event of accident, no communication.
I bought my 2026 GMC in April. Several times the audio doesn't work work. When this happens audio related safety technology is affected too including turn signal sounds and back camera audio also. A person walking behind the truck can be seen on the screen but no warning beeps are heard. When backing up the warning for getting too close to an object also doesn't work. I called the dealer in early may and was told that this was a known issue and that it needed a software update. Took the truck to the dealer on may 8th and the software update was performed. When the update had been completed when I started the truck after the update there was no audio. I told the service advisor it was currently happening and she took it back to the technician. They disconnected the battery cables to reset the system and told me to do that in the future until the issue is resolved. I opened case #100978480 with gm on June 1st because I wanted to be sure that gm was also informed of the issue. I was hoping they would be proactive and report back to me what they were doing to resolve this issue. Instead I was told that I need to call the dealer and the dealer would call gm because an update might be available but dealers wouldn't be informed and wouldn't check unless I called.