GMC Sierra 3500 owners have reported 2 problems related to warning (under the lane departure category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of GMC Sierra 3500 based on all problems reported for the Sierra 3500.
My intellibeam function stops working sometimes, I can still use the lights as normal but the intellibeam function stops every so often and starts working after about 2 to 10 mins. Lane departure warning stops every so often and will start working after 1 to 10 mins, I have noticed that when it stops working at night time then the intellibeam function stops working also. When I press the on/off button for lane departure then it will say that lane departure is unavailable right now. I have been getting a p20ee code showing something is wrong with scr nox sensor 2. Scan tool reveals that the sensor works normal and then stops. Once I clear the code then it works good for a few days.
See
all problems of the 2020 GMC Sierra 3500
🔎.
Weekly you will start the truck and have no audio of any kind. No blinker noises no collision warning noises, no radio, no on star noise. No sound at all and sound will never come back on until you turn truck off and wait 20 mins. GMC says it's a known software issue, but this has been going on since I bought the truck brand new back is April of 2025. I live in a hands free while driving state when it's come to cell phone use and can't even take a call with no audio of any kind. I don't see how GMC can say this isn't a safety issue.
| Problem Category | Number of Problems |
|---|---|
| Warning problems | |
| Assist problems |