2020 GMC sierra AT4

[River gal]

The horn on my 2020 GMC sierra AT4 has quit working, and it doesn’t chirp when you lock it with the remote!   Help

[Bikerjon]

Check the fuse.

[Transient]

My horn has started to sound weaker intermittently, too.  2020 Trail Boss LT.  It still works, so not a fuse issue.  I may need to actually replace the horn. 

[redwngr]

On 12/9/2023 at 11:10 AM, River gal said:

The horn on my 2020 GMC sierra AT4 has quit working, and it doesn’t chirp when you lock it with the remote!   Help

Did you verify that the setting didn't get changed?

 

or Horn Only. 

[Candace Blakemore]

Okay so the fuse is fine but when I hit the alarm button on the remote you can hear the horn clicking trying to work!!   I’m guessing a bad horn or what?  Help

[Bikerjon]

6 hours ago, Candace Blakemore said:

Okay so the fuse is fine but when I hit the alarm button on the remote you can hear the horn clicking trying to work!!   I’m guessing a bad horn or what?  Help

The clicking should be the horn relay. Does the horn blow when you push the horn pad on the steering wheel? Do you have a test light to check for voltage at the horn?

[Candace Blakemore]

The will not blow!!  And no I don’t have a test light

Edited December 14, 2023 by Candace Blakemore

[Candace Blakemore]

Where is the horn relay?

[SporkLover]

On 12/9/2023 at 11:10 PM, Transient said:

My horn has started to sound weaker intermittently, too.  2020 Trail Boss LT.  It still works, so not a fuse issue.  I may need to actually replace the horn. 

For me it was the low note horn going out.   It was $35 for the replacement assembly.  The part number for me was 85130075

[silveradosid]

for my 2020 it shows part number 84447715

[Candace Blakemore]

Okay so I took the horn off and it works but this connector has a wire broke off in it! So how do I get more wire to put back in it or what?  Help

[Bikerjon]

Go to your dealer with your VIN # and ask if you can buy a wire pigtail to connect to your horn.

[EXSlider400]

Just make sure it’s not cut, because if so, that’s the first thing thieves do before breaking into it…then comes the CANinjection override. 

Edited January 9 by EXSlider400

[Candace Blakemore]

How can they break into it?  And what’s can injection override ?

[PhilB]

11 hours ago, Candace Blakemore said:

How can they break into it?  And what’s can injection override ?

Here is an article about CAN Injection hacks:  https://www.securityweek.com/thieves-use-can-injection-hack-to-steal-cars/

 

You can find a horn pigtail on Amazon:  https://www.amazon.com/ACDelco-PT2597-Original-Equipment-Pigtail/dp/B005OUTFSE/ref=sr_1_3?crid=26IJE84XFZE5V&keywords=gm+horn+pigtail&qid=1704896049&sprefix=gm+horn+pi%2Caps%2C120&sr=8-3

This does look like the plug in your picture.