You need an ODB-II compliant code reader to read the code that got tripped. A good code reader will also clear the code as well, or you can have 40 complete start/stop cycles in which the temp gauge goes up to 200 degrees.
As for the front tires - AM General says that you can lose up to 2-3 lbs of air a day. You will also lose up to 1 lb of air pressure for every 10 degrees in temp difference. You also can be losing air pressure if you are running two piece rims and the o-rings are going bad.
There are also other culprits as well - bad solenoid, bad hoses, bad hub seal, etc.
To solve that problem - take a spray bottle of soapy water and spray down every CTIS connection on the tire, on the hub, the CTIS solenoid block, hoses under the truck, etc. If it's bubbling continuously - that's the leak.
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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