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P0128 is a generic code to indicate that the engine isn't reaching proper temp. If it has the Vortec 4.3 like my S-10 is (I am having a similar problem). Check the overflow tank as the tube will come off and allow air into the system, also check the radiator coolant level under the cap. The third item is the intake manifold gasket, check for seepage. If all these things are good I would replace the thermostat (my S-10 had one sticking which could actually be seen on the temp gage, it wasn't reaching the normal 195 degrees). If you have the temp gage on your dash watch for low temperature to indicate a bad thermostat, luckily it sounds as if yours is sticking open as mine did. Hope this helps.
Likely the float inside your gas tank has a hole in it and has filled up with gasoline causing it to sink....or it can be a wire disconnected....somewhere.....check your fuse panel first to be certain it is not a blown fuse...
CHECK GAGES light (1) indicates a potential engine failure(low oil pressure, low coolant, coolant overheating) has occurred. · Check gages and shut down engine. Gages should read as follows: Oil pressure 5 to 10 psi (34 to 69 kPa) at idle; Water Temp gage below 230 degrees (110 C).
· Check engine oil level (Para 2-11) if OIL PRESS gage indicates low reading. Check coolant level (Para 2-11) if Water Temp gage indicates high reading. Notify Unit Maintenance if levels are low.
If CHECK ENGINE light (2) is on, check engine oil pressure gage (3) and water temperature gage (4). If both indicate normal, proceed with mission and then notify Unit Maintenance. If either one does not indicate normal, stop engine immediately and notify Unit Maintenance
Check gauge light can come on for a number of different things, from Low fuel to low oil pressure to high engine temperatures. When the light comes on check all the gauge's and see whats causing it, one or more of the gauge's will be showing an issue, Low fuel or low oil pressure, Low battery power. Any of the mentioned things can cause it... Figure out whats causing it then you can remedy the situation...
A "check gage light" typically indicates a faulty reading on one of the gages located on your instrument cluster. After starting your vehicle, observe your instrument cluster if one of the indicator needles on the instrument cluster remains all the way to the left or "pegs" out all the way to the right, it may be the cause of your fault. The exception is the coolant temperature gage it will take 10 to 15 minutes after which the needle should rise to a normal position. Correcting the "faulty gage light" will depend on which gage is malfunctioning. Once you have figured out which gage is causing the check gage light to illuminate, then we can proceed to correcting the problem causing it.
temperature gage show 150 degrees while driving.
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