3rd Brake Light flashing when brakes applied?

[Tomtom87]

Driving home tonight I noticed that my 3rd brake light above the rear glass slider flashes 3-4 times when I initially apply the brake pedal. Anyone know if this is a standard feature? I didn't add any options from the dealer so this is new to me 

[leonidas711]

What year and trim level?

[Tomtom87]

20 minutes ago, leonidas711 said:

What year and trim level?

2019 Sierra SLT

[CamGTP]

I know it's a standard feature on more and more vehicles nowadays. I see it all the time on newer SUV's but I'm rarely behind a new T1 truck to remember.

[JimCost2014]

57 minutes ago, Tomtom87 said:

Driving home tonight I noticed that my 3rd brake light above the rear glass slider flashes 3-4 times when I initially apply the brake pedal. Anyone know if this is a standard feature? I didn't add any options from the dealer so this is new to me 

Ask your dealer if it is something they may have installed, and charged you for it.

[DogMom]

The dealership I bought my Silverado from installs the "Pulse" brake light on all their vehicles and charge $400 for it. I was going to have it uninstalled prior to taking ownership, however, with all the distracted driving these days and the warranty I decided to keep it. 

[Colossus]

No, not a standard feature.  Just another way for dealerships to make some extra $$$.  It can be an annoying feature, but it can also be good at keeping you from getting rear ended. 

[snork]

yup, Pulse, bitter sweet dealer add-on. should be a GM standard as it is with Cadillac

[jlong1984]

On 1/17/2020 at 12:02 AM, Tomtom87 said:

2019 Sierra SLT

No, it's not standard. The dealer must have added it on. 

[ILSilverado]

You can buy the module on ebay for under $10

[DogMom]

7 hours ago, ILSilverado said:

You can buy the module on ebay for under $10

Agreed, there are numerous third brake light strobe units out there for dirt cheap. Problem is, they may not be legal. Current regulations require brake lights to be steady burning so if you buy your own unit make sure it pulses brighter rather than flashing on and off to avoid a ticket. 

[Thgriffin]

I noticed my third brake light on my 2021 silverado flickered 2 times before staying on. Weird! Im callin the dealership and gonna see if this is supposed to do that. 

Edited January 1, 2022 by Thgriffin

[AlaskaErik]

As others have said, dealer add-on scam.  I find it annoying to be behind a vehicle that has it.  Fortunately, no Alaska dealers do this, but I saw an SUV with it the other day.  Must have come up from the Lower 48 or someone installed it themselves.