Pete 579 intermittent ac 2016

I have a 2021 and the ac wouldn’t always go back on after turning off the truck

I talked with Peterbilt and they said to start the truck. Turn everything on. Then turn everything off before shutting off the truck and that would reset the truck

Not sure if yours is the same but I did that and have turned off my ac before the truck and haven’t had any issues since

 

Just everything on then off then turn truck off
Wasn’t any specific amount of time

If I remember correctly I think I had to do it a couple times then it reset. Not sure

But that was over a year ago when I first bought the truck and now I make sure to just shut the ac down before the truck

 

I agree
I actually talked to one of the regional higher ups and when he told me that I had to comment on what a dumb way to reset the ac

Seen a video of a guy resetting his warning light by turning the key on and of a certain number of times rapidly

It worked on the video but again
Dumb

Just put a Control Alt Delete button on the dash

 

In an automatic, I wait about 15 seconds and then I hear a “clunk” like the transmission is dropping from high to low range. At that point whatever I’m resetting the truck for is usually working again.

It’s a Peterbilt thing, the AC and dash lights are notorious for having to be reset by turning the truck off and back on. I think the ECM misses sometimes and has to be reset. My 579’s have been good trucks despite these annoying traits.

 

Always had trouble with my Peterbilt AC, or dash lights going out, had to turn off truck, wait a few minutes turn it back on.