well I jacked it up and looked at all the sensors everthing is connected and looks good. When I let it down it sounded like the compressor started and ran for a few seconds. I pulled the glove box and the connections look good there also. I am working on getting the software to work on old laptop I have Inpa installed and i get a error IFH-0018 when i try to connect

Make sure the sensor arms are positioned correctly as well. I got the Self Level Inactive message after changing the wishbone and connected the arm pointing in the opposite direction. D'oh!
That or one of your sensors took a crap?

Update: I still have the self leveling inactive on the dash. I checked out all the sensors and connections also the connections on the control module behind the glovebox. I came up with nothing out of the ordnary. So today i was loading up some stuff in the back and the truck was running and the compressor kicked on and i watched it lift the back of the truck up and the dash still has the stupid message on it. I am completely baffled now isnt that the leveing ? What do I look at next ?

Hook up to a GT1 diagnostic scanner and see what it tells you.

This is the only way to find out what's wrong with the system. DIS also has a diagnostic routine for TS the system...

Any chance that you get an occasional TPMS light on he dash?

Not to hijack... but we get that all the time and and self level suspension inactive... when we clear them, they both come back on. What does that mean? Bad module?
The dealer couldn't figure it out...We gave up like 6 months ago

Socket, that's exactly what happened to me. That's why I threw that question in there. The TPMS system is monitored by the EHC2 module (Electronic Height Control 2 Axle) and when the module faults, it can through the TPMS light. Mine would happen only after 45 minutes or so of sustained highway driving. After 3 months of pulling my hair out, killcrap (member on this site) said to look at the EHC2 module. Sure enough, he was right. It's pricey, $640, but it fixed the problem. Thank god for aftermarket warranties.

Yea we had a feeling it would turn out to be the module...damn it! We've already replaced the struts, rear bags, the compressor and the front right height sensor... they were all bad... not just parts swapping. I'll have to see if our aftermarket warranty will cover it. Thanks for the info. I really appreciate it

Module for EHC2 is like 500 more than the EHC module for rear air only cars, sucks.

The PO replaced it before I bought the truck since it was throwing faults, along with replacing both height sensors so that it was clear when he delivered it of faults and i thought it was fixed.

Went out the next morning, both air struts were leaked in front and message was active again, he neglected to mention the front air bags were leaking.

1300 later and the car held just fine, but my compressor was overworked from when the PO owned it and i needed a new one, found one used for 250 and my air suspension works flawlessly.


Sucks that a lot of these parts tend to go in "dominoes", hope you get it sorted out