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My problem is that after driving my 936A2 on a 50 mile trip, system working perfectly, after starting the truck to come home the system started to dump pressure on all 6 tires, no flashing lights on the controller or any other indication of a malfunction. I don’t know how low they were going to...

No tires loose pressure with the plug off the ECU. If it was bad hub seal wouldn't that tire leak down? Going to pull the PCU, dismantle it and clean it up and see what happens.

OK for my problem of all tires deflating as soon as the pressure switch closes and it does around 120 PSI on the cab gauge. I put shop air air on the truck, no leaks noted or heard after two rounds of spraying soapy water on all joints I could find. Tried 2 more ECUs and it did the same thing...

Andyrv6av8r and Jbulach, thanks for the suggestions. I will check the wheel valves and hook it up to shop air and try the run flat selection multiple times. When attempted I will post the results.

Don't remember any siren like whine. I will connect everything and check for something like that. Nice to have system but at least disabling the system allows normal use of the truck.

Left a word out. Should have been a 60 mile drive.

Anyone experienced this problem. M936A2 CTIS had been working perfectly. After restart after a 60 mile and on the recovery mission of my M998 the system decided it wanted to dump all tires down to who knows what. All tires went down to about 20 PSI before I could disconnect the canon plug...