Question about 2001 GMC Yukon XL
Looks like the lower control arms on front of my 2001 gmc yukon xl is resting on a rubber bushing and air shock not holding it up high enough . But doesn't seem to be any leak in the auto ride system and now the rubber bushing seams to be breaking down. The compressor has been replaced but I don't think it is putting enough air in the system. What air pressure should it run at and where can you check the pressure in it.
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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 air pump in located in the very back-left (driver's) side, underneath.
You know the shocks can "look" quit bad and still be okay.
Everything about this system is expensive (to me).
There is also a height sensor that can go bad and keep the air-pump from running.
I recommand an expert on this system.
Your GM Dealer is your best bet for parts.
Just my opinion.
Let us know,
Posted on Mar 13, 2009
Hi mate, they are definetaly your sensors, if the pump is working but does not start, try, unpluging the sensor cables then plug it back in, and check whether the pump kicks is, if not check your fuses, if any is burnt.
Posted on Apr 09, 2009
Try disconecting the batt for 3min careful on some GM models the radio will go into lock out Only the dealer can reprogram "NOT CHEAP" go to autozone have it scanned for free see if there is anouther problem they will not turn off the lite but tell you what the code sais after driving 20 miles the code should have reset there's likley anouther problem. take it to your mechanic have scanned if all else fails. there is no way to manualy turn off code on vehicle. pc should correct after problem is fixed.
Posted on Sep 15, 2010
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