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Posted on Jan 02, 2017
There's a lever that connects the driver-side rear shock to the Automatic Level Control module (the air compressor and the ride-height sensor). Disconnect the lever from the shock and rotate it up and hold it. The compressor should kick in when you hold in place after a few seconds. If it doesn't kick in, make sure your fuses and relays are good. Otherwise, you may have a failed ALC module/burned out air compressor (from the shocks being shot). After you replace the shocks (and after you recouped from the heart attack you had when you shelled out $500+ for each shock), replace the ALC module/compressor (it's all one unit), and test it - it should kick on when you rotate the lever up again.
Figure about $350 for the ALC module from your dealer, and make sure the part numbers match! Your truck came with an upgraded ALC module from the 2001-2004 module, which were prone to water damage.
Posted on Dec 30, 2008
the leak almost 100% of the time is in the air bags of the shocks, there are special tools for isolating the individual shocks and seeing if they leak, but as far as the home repair goes u just replace them or have the dealer test them.
Posted on Jul 20, 2009
the fuse in under the hood in the main fuse box, if your standing over the front drivers side tire, it will be on the far left 4th fuse down, marked RTD/ real time damping..... i believe the fuse is marked 30....
Posted on Dec 31, 2009
yes you must have a leak somewhere. maybe in the air bags or the lines. jack up the car while there is still air in the bags get some soapy water in a spray bottle and start spraying the air bag and lines and pump until you find the leak. then replace whats needed.
Posted on Jan 06, 2010
Just behind right rear tire up in the wheel well. Air inlet is inside right rear quarter near the accessory inflator. Compressor runs 3 lines one for the accessory inflator and one for each air bag.
THere are also 2 sensors, one on each trailing arm that senses load and then raises and lowers accordingly.
Posted on Feb 17, 2010
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Aug 24, 2013 | 2007 GMC Envoy Denali
well I will tell you my problem it maybe the same happening to you, every time I park the car for more than 4 hours it will lower the rear and after I start it will go to normal high, well the car have a air leak on one of the air bags in the rear, the compressor was pumping air almost all the time because of that to the point that one time just stop working. I have to buy new air compressor and 2 air bags. I bought them at www.arnottindustries.com not difficult to replace either.
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