Hi from Overseas, we fixed it today. Forget all the memories about the pcm or acm. The only thing which will fix it is to reinstall the rear sensors, mount on the frame of the axle. Dismount it and move the potenialmeters in every direction to clean it up. Reinstall it, bring the Truck in the right height with the axle on the ground, start the engine and the compressor will do his work, the service air suspension light go off and a dtc is set only in the history of the pcm. delay this with a scantool (not necassaery). The rear sensors are made of plastic ( not a joke) and when I will go out in the fields with my one, I have two spare part sensors in the trunk!!!!!!!
Best wishes to GM for installing 5$ Dollar Plastic goodies in a area where a rock or other things in offroad doin, not need much work to kill it. Maybe the next Generation (H3) has also plastic wheels, maybe there cheap to get in Mexico.
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