Turn signals flashing back and forth.

[Oats467]

I was unloading my truck, I had the exterior lights turned on since it was dark.  On the third trip back to my truck, I saw the rear tail lights flashing on one side then the other.

What is this,  is it some warning?

[sdelam]

Seems you have stumped the group. This is the first I've heard of this. 

[Pete 3500]

My 2021 3500 is doing the same thing. Following replies. Taking to dealer this week. 430 miles, started night I brought it home. please let me know if you have a solution. 

[Colossus]

flashing, or flickering?  Are they LEDs? 

[gSwift]

You mentioned you were unloading with your lights on, was the truck running or not running when this happened? 

[MTU Alum]

Did you have trailer attached?  If so, it could be trailer security.

 

#iworkforGM 

[kylant]

are your tire pressures low?

I just learned that if you have a low tire pressure, the turn signal light in the same location as the low tire will flash

[Colossus]

15 hours ago, kylant said:

are your tire pressures low?

I just learned that if you have a low tire pressure, the turn signal light in the same location as the low tire will flash

it will?  That is going to be confusing as hell to the owners, unless it's in the owners manual and they read their manuals carefully. 

[kylant]

6 hours ago, Colossus said:

it will?  That is going to be confusing as hell to the owners, unless it's in the owners manual and they read their manuals carefully. 

that is what I heard, not sure though

[wallygator]

The guy with the funky DIC went to the dealer and they pulled a couple fuses out and put them back in. Fixed his issues. 

[leverett.scott]

are your tire pressures low?
I just learned that if you have a low tire pressure, the turn signal light in the same location as the low tire will flash

This is true. When the truck is in park, a blinker will flash on whatever corner your tire is low. I've seen it when I aired down to drive on a beach, very confused at first.

Sent from my SM-G981V using Tapatalk

[Colossus]

On 1/2/2021 at 8:56 AM, leverett.scott said:

This is true. When the truck is in park, a blinker will flash on whatever corner your tire is low. I've seen it when I aired down to drive on a beach, very confused at first.


 

Well that is a neat idea!  Maybe.  Credit for the creativity of whatever engineer or individual thought this up!

[Dave mags]

my situation is this

I rotated my tires and the computer sees the front wheel is on the  front not the back where i put it

I run 60 front 80 rear 

Low tire monitor is on 

lights flash and horn beeps when i turn off the truck 

quite annoying when i go somewhere and people think i am beeping at them 

I don't want to go to the dealer every time i rotate my tires 

i did pump up the tires to 65 and everything works as it should except when you look at pressure in information center shows 

the front wheel pressure is the opposite of what it is 

[gSwift]

1 hour ago, Dave mags said:

my situation is this

I rotated my tires and the computer sees the front wheel is on the  front not the back where i put it

I run 60 front 80 rear 

Low tire monitor is on 

lights flash and horn beeps when i turn off the truck 

quite annoying when i go somewhere and people think i am beeping at them 

I don't want to go to the dealer every time i rotate my tires 

i did pump up the tires to 65 and everything works as it should except when you look at pressure in information center shows 

the front wheel pressure is the opposite of what it is 

You have to relearn the TPMS position of the tires every time you rotate. The sensors don't just automatically know where they are on the truck.

[sdelam]

On 1/18/2021 at 8:59 AM, Dave mags said:

my situation is this

I rotated my tires and the computer sees the front wheel is on the  front not the back where i put it

I run 60 front 80 rear 

Low tire monitor is on 

lights flash and horn beeps when i turn off the truck 

quite annoying when i go somewhere and people think i am beeping at them 

I don't want to go to the dealer every time i rotate my tires 

i did pump up the tires to 65 and everything works as it should except when you look at pressure in information center shows 

the front wheel pressure is the opposite of what it is 

https://www.amazon.com/FASLINK-Relearn-Vehicle-Universal-Pressure/dp/B08GSH84D9/ref=sr_1_1_sspa?dchild=1&keywords=TPMS+Reset+Tool&qid=1611146186&sr=8-1-spons&psc=1&smid=A38C5MVY781YQT&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyM0tGVlk1TklMNFkwJmVuY3J5cHRlZElkPUEwNDI0OTkxMjRRWURMRzg2RVY0NiZlbmNyeXB0ZWRBZElkPUEwMjY3NjM2Mjg5N1FITkJQVDFLVCZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=