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At the moment, there isn’t a single, reliable option for the Z62 QX56/80 and Y62 armada in regards to deleting the rear air leveling system.

Just to rule out any leaks at the air lines and their connection points, make a soap + water solution. Spray around the lines where it connects to the shocks and air leveling compressor. If no leaks are found, it could be the compressor itself or the height leveling sensor. A full range scan tool can easily read the DTC for this issue; a pocket scanner can’t.
 

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Thank you

Dealer “comfirmrd” compressor had a leak. Had them repair it. Got it home and looks like it’s still sagging about an inch. Guess they’ll want to throw more parts at it.
Did the dealership replace the compressor? If so, they should've done a reset/relearn procedure after installing a new compressor.
 
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