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When I start the vehicle, it flashes HWY only for a few minutes until the first pressure check. Then it does the pressure check, I hear air noise briefly at the PCV, elephant noise in the back, then it goes to 5 flashing lights. I tried airing all the tires up to 75 psi manually. Still no...

Great question for one of the designers of the system. My gut feeling is to avoid using lube to be on the safe side. Aside from maybe on parts you can directly apply it to and wipe away the excess. But it goes without saying, I'm only just starting to learn how this system works.

I'm guessing this wheel valve is toast?

This thread is awesome. Was able to at least rule out my low pressure switch as a problem. Symptoms: Truck flashes Hwy as normal on startup. Attempts to operate when pressure reaches 120 (or when I jumper pins A and B on that circuit). PCU in cab makes an operatey type noise and then I hear a...