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I would just change it. Only around 75 bucks online. Comes with the o ring also.

I have 2003s that came with the fins style. The purest takes a rn60z cartridge.

Which dryer do you have? Is it the tube with fins or the purest style? The purest ones you replace the cartridge it’s under a black metal cover on top held with 4 bolts. If it’s the tube with fins replace the whole thing with a purest style one.

I believe its a resistance based sender. Higher pressure equates to more resistance. I could have it backwards though.

Tank switch or pressure sender on pneumatic valve?

Its a variable resistance sender.

You could take it off and make sure no gunk on the end. Blow it out with air. Make sure you have good air feed flow to the valve body. I dont know the measurements to take on it. I usually use the swap it out method.

Take it apart and investigate. If there is a short or bad connection somewhere you will get a fault. But it shouldn’t affect data communication with the diag.

Bad or unplugged transducer. Drop the passenger kick panel and look at the manifold. See if anything visible going on.

Two different issues. You can jump the pressure switch on the side of the air tank with a paperclip. Could be a bad ecu. They go bad all the time. Easiest way to diag that is swap a known good one in.

Over the counter part. Service the air dryer. May be compressor unloader needs a rebuild.

You want to see around 125 at governed pressure. As the air is building, once you reach governed pressure, the governor sends an air signal to the unloader valve on the compressor to stop making pressure and also to the air dryer to purge built up moisture out the bottom expello valve. The...

He can connect to the engine. Same data bus on the c7 trucks.

Borrow one somewhere see if it works.

The system won’t start till around 115 psi. Shouldn’t error for a certain time period from initial start. It knows to give time for the pressure to come up. You should still be able to communicate with it. Could be a bad ecu.

Still not enough pressure.

If the gages are correct, 95 psi is not enough to activate the ctis initial self check.

Adjust the air governor down to around 125 psi. If the pressure relief valve on the lower side of the air dryer keeps popping off then you are over pressure. The more you rev the engine the more the compressor makes pressure. I think the safety is set to around 160psi. If that wasnt there you...

I think you are over pressure on your air system. That may explain your other air issues. You can pull one of the tank drain cocks off and screw in a pressure gage see what’s going on.

Is the air dryer dumping out of the bottom expello valve or out of the pressure relief? Maybe you have an over pressure situation.