Active Grill Shutter question

[W4LWQ]

On 3/10/2023 at 10:27 AM, Ronjon said:

I'm going to gut them when I install a new bumper and tranny cooler. Hopefully between the tuning companies now available (RunVSE and PPEI) they can remove their p codes. Since the dealership won't flash them out.

Any movement yet?

 

[Paolo]

My 2017 Sierra is giving the U1051 code. The louvers are stuck in an open position which is okay for me but the check engine light is always on, which is bad for me in the case something else malfunctions. If I disconnect it will that clear the code? I also saw ebay has just the actuator available for a fraction of the whole assembly cost. Will replacing that clear the code? As long as I can get the code cleared I am not overly concerned if the dampers open and close. Clearly its just something else that can break on these newer vehicles. Thanks for any help!

[Ronjon]

The actuator moves, it's just the motor sitting there now by itself. Still throws the code, I wish someone sold a bracket with limit stop to truck the motor and stop throwing the one and only code my truck has ever given me.

[newdude]

On 12/20/2023 at 1:26 PM, Paolo said:

My 2017 Sierra is giving the U1051 code. The louvers are stuck in an open position which is okay for me but the check engine light is always on, which is bad for me in the case something else malfunctions. If I disconnect it will that clear the code? I also saw ebay has just the actuator available for a fraction of the whole assembly cost. Will replacing that clear the code? As long as I can get the code cleared I am not overly concerned if the dampers open and close. Clearly its just something else that can break on these newer vehicles. Thanks for any help!

 

 

No.  Shutter is a LIN BUS device.  Needs to be operational for the CEL to go away.  

[Ronjon]

And to be clear, it needs two hard stops to register as functioning? I need to get my 3d printer up and running if that's the case and make a stl.

[jragan]

Just ran across an engine light that is indicating this. 

 

Shutters are stuck closed and im missing the top left shutter completely. 

Not sure how big of mess this is. any help is appreciated 

[newdude]

50 minutes ago, jragan said:

Just ran across an engine light that is indicating this. 

 

Shutters are stuck closed and im missing the top left shutter completely. 

Not sure how big of mess this is. any help is appreciated 

 

 

Some shutter assemblies on these are intentionally missing the top left.  That is normal.

 

You need to replace the shutter if you have a CEL and code for it.  Simple as that.  Make sure you get the right shutter with the 2.7 as it has an upper and a lower.  Scan the code and it should call out shutter 1 or 2.  

[jragan]

1 minute ago, newdude said:

 

 

Some shutter assemblies on these are intentionally missing the top left.  That is normal.

 

You need to replace the shutter if you have a CEL and code for it.  Simple as that.  Make sure you get the right shutter with the 2.7 as it has an upper and a lower.  Scan the code and it should call out shutter 1 or 2.  

my codes are U0285 and U1345

Engine light is on, comes back on start up after clearing 

[newdude]

2 minutes ago, jragan said:

my codes are U0285 and U1345

Engine light is on, comes back on start up after clearing 

 

 

 U0285 is Lost Communication with Active Grille Air Shutter 2 Motor Module. 

 

Shutter 2 is the lower shutter in front of the charge air cooler.  

 

Before you replace it there are some things to check and test. 

 

READ HERE - WIRING TESTING AND INSPECTION FOR SHUTTER CODES - 21-NA-077 1..5

 

READ HERE - MC-10253068-9999.pdf

[jragan]

8 minutes ago, newdude said:

 

 

 U0285 is Lost Communication with Active Grille Air Shutter 2 Motor Module. 

 

Shutter 2 is the lower shutter in front of the charge air cooler.  

 

Before you replace it there are some things to check and test. 

 

READ HERE - WIRING TESTING AND INSPECTION FOR SHUTTER CODES - 21-NA-077 1..5

 

READ HERE - MC-10253068-9999.pdf

Looks like a nightmare 

 

thanks!

[Partsguy198]

GM has a bulletin out for the 2019 PPV Tahoe's. They actually remove the shutters, leave the frame and motor in place and program out the fault codes.

 

"PIT6052 Active Grille Air Shutter Eliminated On Police Tahoe"

 

Too bad we can't all have that option.