horn beeps after i start off

[425EXPEDITION]

when starting out after the truck has parked for an hour or more,with or with out the doors locked and alarm active or not.after i drive away with in 60-90 seconds the horn beeps once.its been doing this for amonth or so it shows no dic warnings nothing but the horn beeps once.thought this very strange.any ideas ? thanks in advance.this is on an 01 2500 hd with 50 k on it.the truck also had the horns repalced a few years back for the water filling them up and the horn works fine when you need it

[agtandt]

Have you had the truck since new? Do you know if it has an aftrmarket alarm that may be in programing mode. Just a thought

[GM-Tech]

Definitely a strange one. Never heard of that one before. It'd be nice to be able to look at BCM data when this happens to see if the BCM is getting an input to sound the horn. Without that information, this is going to be difficult and pure guesswork to figure out.

 

If you have an aftermarket alarm that uses the horn, I'd definitely look to that first. The horns filling with water is pretty common but I've never seen it cause the horns to beep. They just don't work at all.

[425EXPEDITION]

Definitely a strange one.  Never heard of that one before.  It'd be nice to be able to look at BCM data when this happens to see if the BCM is getting an input to sound the horn.  Without that information, this is going to be difficult and pure guesswork to figure out.

 

If you have an aftermarket alarm that uses the horn, I'd definitely look to that first.  The horns filling with water is pretty common but I've never seen it cause the horns to beep.  They just don't work at all.

 

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ive owned it since new and actually would never put an aftermarket system in any of my vehicles because of a big problem i had in the past with another truck. i was thinking it was maybe the factory alarm causing it but i dunno.in the next few weeks ill be doing my plowing maintenance on the truck and will try to disco the battery to see if maybe something resets,also have access to a scanner. im also going to be bringing it back to the dealer for broken exhaust manifold bolts(heads of the bolts popped off) 2 on each side and it sounds horrible until it warms up when everything expands.. ill see if they ever heard of this strange horn thing.the engine knock is bad enough and i have been asked if its a diesel,nope just a 6.0 knocker. i got the special free 7 yr/100k warranty because of the knock and it does list manifolds and gaskets are covered.it also did this at about 25k and they fixed it under warranty so it has a history and im hoping for the best because i dont want to do it..happy,happy,joy,joy

 

if anyone else has any ideas feel free.thanks