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4.11 isnt an LMTV ratio... 3.9 is...(I wish we had 4.11:))... CTIS on the A0 counts output speed pulses from the trans and determines speed to compare against its lookup table for selected pressure to determine overspeed. Not sure if the newer trucks pull speed info off of the data bus or...

General beat me to it. Tire imbalance will cause this. After it has been sitting, Walk around with a tire pressure gauge and check all the tires before a startup To figure out which wheel valve is leaking. Another giveaway for this is to shutdown the truck, get in under the truck and put a...

Is it when you first startup the truck?

Well if you had a really restricted feed, it might cause the controller to not see the expected result of an inflate cycle, but so coukd a wonky pressure sensor circuit, or excessive leakage...

Well if it isnt leaking anywhere, then it is probably a pressure sensor, wiring or the controller feeding its 5v reference... or of course the controller itself...

Yes, but what the dump valves are doing can help point you in a direction. If you give it a shot of air and seal it, a sealed system should be able to set indefinitely. If they are venting air, you are leaking air upstream toward the PCU and the dumps are releasing tire air to match the...

Leaks can be sneaky. Pressurizing by applying air to the line coming out of the PCU, then sealing that line is as good as any other way to pressurize the system. It of course takes the PCU out of the equation so does not test its ability to hold air as required… When looking for leaks don’t...