SIDE BLIND ZONE ALERT 2020 Sierra

Wm Johnston · November 9, 2020

Today, 8 November the weather was really nice for the Northeast, instead of a snow storm it was sunny and 73. While on the interstate my drivers side SIDE BLIND ZONE ALERT lights kept coming on. (Both the car and star lights on the mirror). There was no one next to me or near me when this would happen and they would stay on for several minutes. Other times it was off and then would function normally as expected when vehicles past. I was not in the passing where bridges or guardrails would activate it.
Anybody else with this issue?

I know, call the dealer but just checking first if this a new glitch or have others had issues.

jnissen · November 10, 2020

Only had issues in other vehicles with those ultrasonic sensors if bugs or a thick buildup got on them. Not sure if the Sierra is using ultrasonics or radar.

Either way if the trucks relatively clean shouldn’t be doing that.

Just looked it up. They are radar sensors. Known issue is they sometimes will trigger for guardrails on the highway.

Jason Rebellion · November 10, 2020

Sometimes mine will go off for the weird sized concrete barriers used for construction

JWOutdoors29 · November 10, 2020

I've had mine go off next to large bushes/shrubs in a median close to the road, but you said you had nothing around you. My front parking sensors will also go off when sitting at a stop light with nobody in front of me. Only thing I can think of is its picking up the white line on the pavement where you are supposed to stop? [emoji2369] I keep meaning to ask the dealership if there is a calibration for these or of that is normal

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joostan · January 30, 2021

Had this happen to me today in my ‘21 SLT. Passenger side. Intermittently coming on for no reason. Occasionally my camera system goes down too. Usually fixes on a restart so I’m hoping it’s back to normal tomorrow

Edited January 30, 2021 by joostan