Sounds like your coolant temp sensor is acting up... Unless you are actually overheating.
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SOURCE: hummer h2 2003 55000 mill
Remote the battery wire from the car for 20 minutes make and plug it back this will reset the computer of the car if the light is on you need to service center and get it checked....................
SOURCE: my 2003 h2 hummer will initally not shift from
Check the linkage that goes from the shift lever down to the transmission. It sounds like somewhere along the line, it has become disconnected or has broken.
if that parts are clean then It sounds like you have a shift control solenoid that has high resistance causing the hard shift you describe. Scan the PCM for trouble codes if none are present you could have a internal transmission problem.
SOURCE: is there a fuse for the rear supension on 2003
CHECK THE VSES/ECAS ELECTRONICALLY CONTROLED AIR SUSPENSION MODULE OR LOG ON WWW.HUMMERXCLUB.COM/MANUALS/2003 H2.PDF FOR MORE REFERENCES.
SOURCE: i have a hummer h2 2003 whith a p0135
What you have to do is replace the o2 sensor on bank 1 sensor 1.This is the front sensor on the left side on the exhaust system.Left side is bank 1 and right side is bank 2.Make sure the connections are good first.Usually it`s the internal heater in the o2 sensor.Hope this helps.Good luck.
SOURCE: why is my oil pressure gauge on my 2003 hummer h2
My H2 has also same problem. But it occurs even when engine not started. I mean when I turn my key ON position the gauge shows over 80, without starting the engine. Does anyone knows the problem?
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