Air ride

[Linelife99]

I have a 2006 yukon xl Denali with auto ride. I replaced the rear shocks with rebuilt oem parts last year. When I put a trailer on the yukon, the rear end sags. Is there a way to check the compressor to see if it is bad or good? The fuse in the fuse block it good. Haven't check if it has power to it. What color is the wire at the compressor? Last winter there was a code to check auto ride. I pulled all connetions and cleaned them. Code went away. Thanks for the help.

[gmtech4]

Get it scanned and buy service info if you're handy , if not .... Guess where it needs to go for this computer controlled system ............any garage that can fix it ,,,

[Linelife99]

They'll be able to scan it without it throwing out a code?