txcj

Just to follow up, the local automotive repair shop diagnosed my problem as failed front shocks...$1700 dollars to replace. I paid it, then found out they replaced the front shocks plus they didn't tell me they replaced the left rear, too (same position as Wild Bill's). I noticed that one was replaced on my own a day later. When I went back and asked them about it, they said they replaced it "on their dime because changing the front shocks helped, but didn't totally solve the problem." Trust = low. I was rushed for time as I was headed out on a 2000 mile vacation the next week, but now I think I would do it for myself. All except the front coil squeezes and the ride height trim procedure. Can anyone recommend a mid-level ODB2 scanner that can perform this reset on my 2018 Tahoe? I saw this vid from Xineering LLC that shows an Autel MaxiDAS DS808 can do it...is there anything cheaper?

I have a 2018 Tahoe Premier with 60k miles and have the same problem right now...terribly stiff suspension. I also notice the compressor does not come for a short bit after I start the vehicle(I think it's supposed to). Today I checked the 2 fuses I know of (# 5 suspension leveling compressor, and #45 ALC run/crank, any more I need to check?) and both were good. I checked the operation of the ALC relay and it was good. With the relay out, I jumpered the connector and the compressor turned on. I also started the vehicle and tried to see if there was a signal going to the relay to turn it on, but I was not able to confirm that signal is being sent to the relay. I'm guess I, too, have a DTC but who knows which one. I'd like to buy me an aftermarket Tech2 scanner but have no idea if they work properly or would allow me to run functional tests of this system like I see online. Can anyone recommend a scanner that could see DTCs down to this level? @newdude: Thank you for that info.