High Beam Flash with Left Turn Signal Engagement 2020 2500HD High Country

[Benthecuban]

Hello,

    I am having a issue that just made itself apparent about a week ago. Every time I engage the left turn signal the high beams flash. MY truck is a 2020 2500 High Country, with 42k on it. Please help.

[kylant]

probably an issue with the multi switch lever. may just need to get a new one

[Benthecuban]

Thank you for the response. That is what I was assuming, I am really curious if anyone else is having this issue? I love this truck, but it seems as if I keep having more and more issues with it and now that it is out of warranty that is pretty upsetting.

[72YF3]

I'm having this same issue (high beams flash on when putting on the left blinker only) . Started last week. 2020 Silverado 1500 LTZ, 55,000 miles. The turn signal lever felt/acted different for a day or so, then the high beams started the flash but only while engaging the left turn signal. Guess it will go to the dealer. 

[nocturnalmotors]

Maybe this bulletin applies?MC-10191253-9999.pdf

Edited June 13, 2022 by nocturnalmotors

[goodspeed9000]

2021 Silverado with 57k just started doing the same thing.  Cheap parts I assume.  When I pull down to signal it flashes the brights.  Likely just cheap plastic internals in the lever that have worn down and it's now able to make the connection with lights switch and turns them on.  If I'm super careful I can keep it from clicking over and not flashing, but it's become a complete nuisance.

[Leem]

I think GM has had this issue for a while. My 2007 CTSV had this issue and my neighbor Chevy SS  both times it was left blinker . But my car's high beams stayed on. New switch GM stalk fixed the issue . 

[72YF3]

Update, I finally got around to taking my truck in to the dealer to have this blinker/high beam thing addressed. Yep, replace the multi-switch. Of course, they don't have one. It will be in, in a week. another trip to the dealer. At least it's covered under warranty.

[Mike16LTZ]

I am having a similar issue. 2016 Silverado LTZ 1500. At first i started getting a fast left blinker flash and a warning light saying "left rear turn signal indicator failure". They are LED, so i had to buy a new set of tail lights. Well, the problem didn't go away. Not only do i have that problem,  but now my truck has decided to start flashing the left high beam with the left blinker. Everything else works as it should. Could it be the multi switch?

[Reeno V]

2022 Silverado LT 2500HD, 6.6 Duramax. Exact same problem. At the dealer getting the turn signal multi-switch replaced under warranty. 

[Darien Adolph]

Guess they overlooked fixing this issue. I’m currently having the same problem on my 2023 Silverado LT

[Boonechaser]

Mine just started doing this on my 2019 (new body) I have 60k miles. Just ordered the multi switch to swap it out.

[ilvoyage]

Same. 2022 Sierra 1500, 38k miles. High beams engage on right signal. 

[Denali1986]

On 5/8/2025 at 7:35 AM, ilvoyage said:

Same. 2022 Sierra 1500, 38k miles. High beams engage on right signal. 

Same. Did you ever get it fixed? What was it? Mine just started doing it on the right side