I have an 06 gmc envoy denali xl and i'm having a rear end saggin

Question edited for clarity.
Question moved to model category.

Here are all your fuses

GMC Envoy (2002-2009) fuses and relays

https://fuse-box.info > gmc > gmc-envoy-2002-2009-f...

Here you will find fuse box diagrams of GMC Envoy 2002, 2003, 2004, 2005, 2006, 2007, 2008 and 2009, get information about the location of the fuse panels ...

Shane, Base 235 75R16, SLE, SLT, XL SLE, XL SLT P245 65R17,
Denali, XL Denali P245 60R18. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
GMC Envoy Tire Sizes
2006 GMC Envoy Tire Sizes
Tires for my Envoy Denali Recomendations

There is a level sensor connected to the lower control arm on the rear wheel on the drivers side. This operates the pump and lets air out if it is too high in the back.It can fail. Most likely the air pump has gone bad. Expect 800 + to fix it.

Ride control compressors burn up because of leaking air line or shocks. Replacing compressor won't last long if you have a leak. Most of these units are mounted under floor near rear axle.

The shifter cable end is probably broke.

There is probably a leak in the air hoses somewhere.

There has been a service bulletin for that type of concern. Here is what it states.









Suspension - Rear Suspension Is Low/Sagging/Uneven

Notes




ENGINEERING INFORMATION

Bulletin No.: 06-03-09-006B

Date: December 15, 2008
Subject:
EI06006 - Rear Suspension Uneven, Sagging, Low (Recalibrate Air Spring Sensor)

Models:
2006-2007 Buick Rainier
2006-2007 Chevrolet TrailBlazer SS
2006-2007 GMC Envoy, Envoy XL
2006-2007 Saab 9-7X


with Suspension Pkg - Rear Load Leveling (RPO G67)

Supercede:

This bulletin is being revised to update the labor operation in the warranty information. Please discard Corporate Bulletin Number 06-03-09-006A (Section 03 - Suspension).

Condition

Some customers may comment on the rear suspension being uneven or sagging.

Correction

DO NOT REPLACE THE COMPRESSOR.

Based on technician feedback, engineering has determined that the customer's concern can be corrected by recalibrating the air spring sensor. Refer to the Trim Height Uneven or Low diagnostics and Air Spring Sensor Calibration procedure found in SI.

I am having similiar problems with my 06 Denali. Mine does the same thing but also does not blow hot air when in idle.

Mine does the same. Couldn't find a fix.I am not sure if this is weather dependent. It does more when it is cold. i am afraid that one day it will stay low where the hydrolic give up Please share your solution if any