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If your tire pressure reads zero at the wheel valve with the truck off, you almost certainly have valve cores in tour wheel valve stems

No, you need to remove the valve core where the CTI hose screws on to the valve stem of the wheel, not the valve core on the wheel valve...

Also, if your CTIS will not work after removing the valve core, as long as your wheel valve is good, you then will be able to manually add air from the valve stem on the wheel valve

Give it a shot. If your controller goes 5 flashing lights, hit the run-flat button and that should help keep it from faulting out as fast. It'll also helps if you can hook the truck up to shop air, and not start the engine, so you can listen for and start tracking down leaks while it's filling.

Inflate and dump times are programed for the volume of six tires. The more tires you eliminate the the harder time the system has finding it's target.

You can put it run flat mode to keep it from faulting out, but it will constantly chase the pressure up and down, never finding it's target pressure. I have used mine with valve cores in only the front two tires, and it still took forever for it to stop hunting for the correct pressure in the...