What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[Doubeleive]

Ya the pump is my primary suspect, I was hoping the tech2 would verify because I hate random issues so I'll have to just wait and see now or do some more testing later today, I called the dealer back and told him I think his tech2 is wacky there's no way I have all that going on without getting codes and there is none.

 

[Doubeleive]

I just stood on back bumper and autostarted the truck and the pump didn't come on I weight 217lbs so I would think that would make it come on?

 

[kbuskill]

I just stood on back bumper and autostarted the truck and the pump didn't come on I weight 217lbs so I would think that would make it come on?

I could be wrong but I don't think the pump gets power until the key is actually in the run position just like the radio and other things don't turn on until the key is in.

If the compressor is functioning properly then the compressor should turn on for a few seconds after starting the truck with the key.

After you shut the truck off if you stand near the gas tank filler you should hear the compressor dump a little and stop and dump a little and stop... it will do this multiple times before it stops. It should dump the air everytime the truck is turned off.

 

[Malik112099]

Added here...

Added a LTZ Suburban to the fleet
https://r.tapatalk.com/shareLink?share_fid=17772&share_tid=95403&url=http://www.tahoeyukonforum.com/index.php?threads/Added-a-LTZ-Suburban-to-the-fleet.95403/&share_type=t


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thanks for the write up. Doesn't look like it will work in my 07 Denali tho.

 

[M1Gunner]

Just a quick wash and detail.

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Love the Burban man, what lift do you go with on that beast?

 

[swathdiver]

so he whips out a tech2 he keeps behind the counter, plugs it in and every thing imaginable lights up, tpms error, airbag, service stabiltrac, no temp reading on trans, the rpm gauge drops dead,

That normally happens when someone connects the Tech2, powers it up and then starts the truck. Don't ask me how I know!

 

[Doubeleive]

I could be wrong but I don't think the pump gets power until the key is actually in the run position just like the radio and other things don't turn on until the key is in.

If the compressor is functioning properly then the compressor should turn on for a few seconds after starting the truck with the key.

After you shut the truck off if you stand near the gas tank filler you should hear the compressor dump a little and stop and dump a little and stop... it will do this multiple times before it stops. It should dump the air everytime the truck is turned off.

I have a aftermarket viper system installed, when I autostart everything comes on radio, ac, lights etc. but at any rate I have never heard it purge air, I just went out and put the key in and twice in a row it filled with air and then stopped after the second try, I sat there and listened by the pump and it's not purging any air unless it's doing it really slow,could put the hose in some water and see if it makes bubbles I guess

 

[Doubeleive]

That normally happens when someone connects the Tech2, powers it up and then starts the truck. Don't ask me how I know!

so it makes it throw every gizmo crazy? makes the rmp gauge drop to 0?, seems rather strange to me

 

[kbuskill]

I have a aftermarket viper system installed, when I autostart everything comes on radio, ac, lights etc. but at any rate I have never heard it purge air, I just went out and put the key in and twice in a row it filled with air and then stopped after the second try, I sat there and listened by the pump and it's not purging any air unless it's doing it really slow,could put the hose in some water and see if it makes bubbles I guess

Mine is very noticeable when it dumps the air but mine is a Dorman replacement pump.

There is/was a common problem with a white wire leading to the dump valve getting corroded and causing the exhaust valve not to work.

 

[Doubeleive]

now I'm really stumped went out with some water and turned the key on and service suspension light is on again, I didn't even drive it, turned the key off manually purged both shocks, pump fills them up, error is still on now.....
edit went out and pulled fuse 2 & 54 again error went away, doesn't clear from fuse 58 (40a)
so I presume it's going to keep coming back on, at least that will make it easier to find