My 2003 yukon xl has a rear suspension noice every time i go over a bump or so

has your vehicle got ABS braking system ? if so i'd get the OBD codes read if not already done as may be a sensor/switch that is sending an incorrect signal to the brake system after the bump at the same time , there is sometimes a brake limiter valve fitted to the rear suspension ,if your vehicle has this component i'd have that checked as the suspension will obviously rise/fall when going over bumps , let me know how your mechanic responds to these suggestions

Might need to adjust rear door latch, or could be bad relay or switch. Try pulling/pushing on rear door while closed to see if you can set this off while sitting still.

Would need to know what DTC'S - diagnostic trouble codes are stored in the module for the autoride suspension . Hooking up a professional type scan tool ,looking at input data to the module etc... Looking at a wiring diagram an testing electrical circuit's using a DMM - digital multi-meter . Reading how the system works ,what all involved in making the system work . This is how a professional Tech would go about diagnosing this .

The automatic level control (ALC) system maintains a desired rear suspension position under all types of towing, hauling and loading conditions. The following components are involved in the operation of the ALC system:
• Air line tubing--Pressurized air from the ALC compressor is pumped to each of the rear shocks via air line tubing.
• Air drier--Pressurized air from the compressor is run through a drier containing a moisture absorbing chemical preventing water accumulation in the rear shocks.
• Compressor--Supplies pressurized air to the rear shocks
• Compressor motor relay--The relay supplies battery positive voltage to the ALC compressor motor.
• Pressure sensor--The electronic suspension control module (ESCM) module provides a 5-volt reference and low reference to the ALC pressure sensor. The module receives the signal voltage that is relative to the air pressure applied to the rear shocks.
• ESCM--Controls the ALC system and electronic suspension control (ESC) system and detects failures in both. The module monitors inputs from the position sensors, and pressure sensor to determine when to raise and lower the vehicle to trim height as the vehicle is loaded or unloaded. The module limits pump activation to 255 seconds to prevent thermal damage.
• Exhaust valve--An electric solenoid activated by the ESCM to vent air pressure from the rear shocks.
• Left and right rear suspension position sensors--The module provides a 5-volt reference and low reference to all 4 of the body-to-wheel suspension position sensors. The sensors send the ESCM a signal voltage that is relative to the rear suspension ride height
• Left and right rear shock absorbers with internal air chambers and dampers--Dampens the rear suspension and maintains trim height depending on the air pressure applied.

Look for a chaffed wire in the hinge area of the driver's door. That's the most likely place to find a short or break

Check cv joints. check wheel bearings.. Check wheel nuts are tight and are tightening up on the center part of the wheel

YOU BLEW A FUSE

possible intermediate steering shaft, becomes lose and annoying, are you making a hard right turn? does it happen when you go over bumps?

Check this site out they got everything for autoride suspensions

www.arnottindustries.com

you need a tool that goes in a slot in the rear bunper

30 foot pounds