Try disconnecting the battery for 10min to clear code and then start truck and let it run with all doors closed(air suspension operation is disabled with any door open) see if the bags inflate, if not tow it to dealer, dont drive on empty bags or you will damage the bags and your back.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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