Does my 2020 Tahoe have an air compressor? I hear a noise, sometimes.

[Joseph Garcia]

Great suggestion, I will give that a shot. Going off of memory, I don't recall hearing that noise right when I start the vehicle. You'd think if there were a small leak it would kick on the compressor to fill it with air, but I don't know much about the vehicle, I'm learning as I go.

Thanks.

The compressor should start for 4-5 seconds almost every time that you start the truck, after leaving it off for several hours, as part of the diagnostics routine upon startup.

 

[nomech]

The compressor should start for 4-5 seconds almost every time that you start the truck, after leaving it off for several hours, as part of the diagnostics routine upon startup.

I've put 160k miles on the car and I just don't recall hearing that on startup. Of course I am not accusing you of being wrong, you seem to know what you are talking about, I'm just going off of my memory. When I first heard that noise happening more often (about a month ago) it was not a familiar noise to me.

I will pay closer attention, thank you.

 

[Joseph Garcia]

I've put 160k miles on the car and I just don't recall hearing that on startup. Of course I am not accusing you of being wrong, you seem to know what you are talking about, I'm just going off of my memory. When I first heard that noise happening more often (about a month ago) it was not a familiar noise to me.

I will pay closer attention, thank you.

No worries. Yes, I'm quite familiar with that system, as I had to reinstall it, along with module changes and re-programming, as the previous owner had stripped out the Z55 system and replaced it with cheap passive shocks.

 

[Meathead16]

If you miss the noise on start up, just throw something really heavy in the back, should start to lift within a few seconds

 

[nomech]

Start your truck with the driver's door open, and head toward the rear left tire as soon as the motor starts (and before it goes through its diagnostic routine with all of the dash lights), and you'll arrive at the back tire just about the time that the compressor starts.

Yup that’s where I hear the noise. I made it back there right after starting the vehicle and I also saw something with minimal vibration and the vibration stopped when the noise stopped. Ran for a few seconds as mentioned.