The check gages and check engine lights are coming on when the trucks is running, but not moving
The sending unit is behind the distributor on top of the block. And if the service engine light comes on, most auto parts stores like Pep Boys will check your car for free, and if it only comes on while running but not while driving that will steer you in the right direction. But I would try this first, reset the computer. To reset the computer in your vehicle all you need to do is disconnect your battery for 5 minutes, then reconnect your battery and your computer will start fresh, if a there is a problem a sensor sends a signal back to the computer.
Look or feel behind it, under dash, feel to see if its plugged in, if so, change the oil pressure sending unit, or fuse(but i doubt it).
SOURCE: truck runs great but the oil pressure gage goes zeros out
Did you find the sending unit and was that the problem?
SOURCE: locate the oil sending unit on a 2003 6.0 2500HD silverado
You will find it down by the oil filter.
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Loose connection somewhere, you can check the fuse, doubt thats it tho.
Check for a loose ground wire from the battery to the body and any ground wires from the engine to the battery. Also get the battery voltage checked when you have this condition; maybe the alternator isn't charging enough at idle; you didn't state if the truck is in gear or in park when this happens.
You have a code set to the ECM which would be in your emissions sensors(egr,tps,etc).To test the check engine light,take a small jumper wire and stick one end in the ground(A) and the other end in the test teminal(B) which is located under driver side dash which is called the ALDL.It willflash on your dash after you turn the key on 12.which means its working properly.The check gauges light might be on cuz of maybe low oil pressure.You need to check your oil ,battery,alternator etc
Check for a loose ground wire from the battery to the body and any ground wires from the engine....... If that was the case, that ground wire will not even start the engine, there's nothing serious here.
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