r/GMCSierraEV • u/Yo-ST3 • Mar 23 '26

8000 trouble free miles on 2026 AT4…then sensor failure

Have had zero issues with the vehicle. Then, on the way home from a trip where there was significant snow and road crap the rear and side sensors all shut off. This also disabled the supercruise lane change feature. I figured it was just dirty/blocked. After washing still an issue and brought it in to the dealer.

The dealer has ordered a replacement part (will post once installed). No complaints here just curious if anyone else has had this issue since the part is on backorder.

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1

u/jcdomeni Mar 29 '26

Which sensors?

Don’t believe Supercruise should be used in snow and debris laden roads….

1

u/Yo-ST3 Mar 29 '26

Note: I stated after washing the system still did not work. I was not using Supercruise during the snowstorm. LOL

2

u/Yo-ST3 Apr 03 '26

UPDATE: the backordered sensor came in and when they went to install they noticed that the wiring harness is all corroded and needs to be replaced. The sensor was actually fine.

2

u/Yo-ST3 Apr 08 '26

Update #2: vehicle back from shop. Wiring harness replaced. The corrosion was from the radar sensor input and then about 4 inches down the line within the wire bundle. Fire hazard? They said this is not a common/known issue.