Honking and Emergency Flashers came on when inflating the Tires

[giganova]

Last night was the first time this season that the temperatures dipped below zero, so tire pressure was low on all tires (29 psi). I left the engine running, got out my tire inflator, connected it directly to the battery and started inflating the tires, when, after a few minutes, the truck repeatedly honked once and the emergency flashers came on.

I have no explanation for that. Did the battery level fall below a critical value and the truck wanted to tell me? Did I put too much air into the tires (40 psi) and the truck wanted to tell me? It's a '21 1500 Long Horn with 22,000 miles.

Thanks for any clues!

 

[NETim]

I suppose it's possible that a 12v tire inflator could be electrically noisy and feed noise back into the electrical system of your truck.

Since the truck went whack-o with the 12v compressor connected, the compressor would be my first suspicion.

 

[mtnrider]

Did you have your keys in your pocket? Probably hit one of the buttons or it was a warning the key had left the vehicle. Highley unlikely the compressor could have done anything to cause that

 

[runamuck]

on mine the horn honks when reaching the preset tire pressure setting in the ECM so you know when you're done. the first time I didnt know what it was either.

 

[BadHemi2014]

I remember another post(s) here that this is a TPMS thing so when you inflate a tire the truck honks to tell you it's at the right psi.

 

[giganova]

on mine the horn honks when reaching the preset tire pressure setting in the ECM so you know when you're done. the first time I didnt know what it was either.

Yes, that's it, what a fantastic feature!

 

[turkeybird56]

HOW TO Use RAM Tire Autofill Alert System (2019+ Dodge RAM)

Does your RAM have tire autofill alert capability?! Only one way to find out!! Join Mr. Greg as he walks you step-by-step through this easy-to-use system. ...

www.youtube.com

IN the video, tells you to see if you have the system. FYI: Unless you have a higher trim level, you may NOT have that screen option in your truck. If you do not see it, check your Build Sheet. I have a lower trim Bighorn, and even though the screen does not show that selection, I have the system as per my Build sheet and it does work, though I think a DIGITAL TIRE GAUGE be your best friend.

FROM MY BUILD SHEET: Tire Fill Alert under standard equipment.


Tire Fill Alert
This feature notifies the user when the placard tire pressure
is attained while inflating or deflating the tire.
The customer may choose to disable or enable the Tire Fill
Alert feature through use of the customer settings in the
radio.