Oil Sensor light keeps coming on 2003 H2 Hummer

I would suggest having the vehicle scanned before going any further. Are there any other accompanying lights on the dash?

Your oil is low or you have a bad oil pressure switch / sensor

your oil pressure sensor is not the problem. the motor that runs the gauge has failed. a replacement gauge cluster is the solution

Oil Pressure sending unit. Good Luck

Did you try changing the actual oil pressure gauge?

These vehicles have been known to have failure of servo motors that drive your guages and routinely read wrong is this your only guage issue I just replaced three of these servos on a freinds H2 the motors are about $2 on ebay

did you check the oil pump stream? dirty or low **** oil in the bottom oil pan. check the oil pressure with the oil pressure tool meter and get a trusted values

Go to faxonautoliterature. They carry the original dealer service manual for your Hummer. It will havwe wiring diagrams in it. I have used them before and had excellent service. Hope this helps.

usually that sensor is on oil pan or the block in the front of engine.

First thing that i would reccomend is switching to 5w30 oil since this is what GM wants you to run in your hummer. Next i assume your gauge is pegged out and doesn't fluctuate. You are going to have to take your hummer down to the local dealer and have a computer hooked up to see if the gauge is bad or the oil pressure sender is bad, more than likely the sender. thanks for using fixya !! have a nice day