Active Shutters Missing Fin?

AlaskaErik · March 9, 2020

11 hours ago, OnTheReel said:

There may be other reasons, but as far as I know, max trailering package trucks don’t get shutters. Mine doesn’t have them.

That explains that. I have the Max Trailering package.

Vasa1 · March 9, 2020

Speaking of these, do they open in warmer temps? Mine have been closed so far.

BlancoSilverado · March 9, 2020

On 3/8/2020 at 6:49 AM, Thomcat said:

Thought they all had shutters to shape the truck like an aerodynamic brick at high speeds. Have to look carefully through the front grille to see them edgewise; they are open when vehicle is stopped.

All of them do, but the trail bosses/AT4 dont.

Chrisd534 · March 10, 2020

10 hours ago, BlancoSilverado said:

All of them do, but the trail bosses/AT4 dont.

I have an AT4 with shutters. As OnTheReel commented he said max trailering packages are the only without

BlancoSilverado · March 10, 2020

12 hours ago, Chrisd534 said:

I have an AT4 with shutters. As OnTheReel commented he said max trailering packages are the only without

in 2019 model year I couldnt get them optioned in the Trailboss. Maybe the salesman didnt know how to use the GM site well?

He told me that the NHT (max trailering) does have them available (why would they even have them available?)

My Bad, thank you for bringing this to my attn. ill do a little more research,

fishlessam · March 10, 2020

My 6.2 Denali has them

SRWalker · July 11, 2020

No account yet, but 2020 Silverado with 3.0l Duramax here. Same issue; I noticed the other day that the top shutter on the passenger side was missing. Checked for damage thinking maybe it got knocked loose by an errant bug, but there was no damage to the plastic. I assumed it must have been deleted, and planned to check with the dealership about it. Glad to see that it was probably intentional, though I'm curious why. I am thinking it has to do with the location of the air intake plenum and how much air this thing inhales.

BlackItOut · August 22

I have a 2024 with a Duramax 3.0L. It does have the active grill and is also missing on the passenger side. I’m beginning to believe it’s missing to keep the engine cool if they stick shut from a malfunction.

redwngr · August 22

Top passenger side does not have a blade.

silveradosid · August 22

by that pic it looks like the horns are mounted in the area where the fin is missing

redwngr · August 22

They call them aero shutters.

Primary purpose is to improve aerodynamics when 'cruising'.

Some airflow is still required for coiling.

An explanation published on the GMAuthority website.

General Motors Active Aero Shutters Technology | GM Authority

repairman54 · August 24

Blade missing in front of the horns is so horn sound is not reduced when shutters are closed.

Most likely so DOT requirements are met for horn sound projection.

PunchT37 · October 23

Just brought my `25 1500 with 5.3 home today. NHT package. No shutters here.

newdude · October 23

42 minutes ago, PunchT37 said:

Just brought my `25 1500 with 5.3 home today. NHT package. No shutters here.

Correct. I think NHT and then all VYU plow prep do not have shutters. All others do.

Z45 · October 23

Per GM

Sierra/Silverado Models equipped with upper and lower shutters, the top passenger-side louver/vane of the upper shutter is intentionally missing from the shutter assembly for airflow reasons. Do not replace the shutter for the missing louver/vane.

Edited October 23 by Z45