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The D/S HAV control also known as the deadman valve at the rear driver side (if you search it you'll find a ps magazine article on it). I have confirmed that the brass fittings nor hoses are leaking. What is leaking is the valve where both hoses connect into (which TM calls a three way air valve...

Truck had lost communication with ECM codes picked up by transmission trouble codes. New transmission control module was installed. New TCM does a audible buzzing sound when powered up. Took it for a test drive and it lost communication again. What does it mean by the buzzing audible sound?

Thanks!

Troublehshooting LMTV which automatically deflates all tires only when CTIS is connected. The odd thing is that it's a 2 axle truck and the rear axle leaks air continuously at what appears to be the rear differential vent valve. It has a rubber hose at the top of the axle next to the...