2005 chevy malibu's gas gage is not working properly..reads more gas then is in tank... what could be possible problem?

If your mileage has dropped to half, I would be worried about what is wrong with the car. Chances are it is running very rich and using way more fuel than it should.

just replace my fuel pump /sending unit on my 06 Malibu, didn't matter if the pump was in or out of the tank, the gauge still reads wrong

Common symptom of faulty sending unit in tank.Remove tank and replace sending unit

its either a bad wire or ground to tank. or the sending unit in tank is sticking. have a good day !!

hey the reason your gas gauge is going from full to empty is that your fuel pump which is in the gas tank has a sensor that relays how much gas the tank has in it, the sensor is gone bad and will have to be replaced. And your engine light problem is probley due to putting gas in the car while it is running, my wife has a 2005 malibu and we have had the same problems with her car hope this was helpful

this is caused by the gas gage sending unit inside the gas tank failing

its a problem with your sending unit most likly. its in your gas tank and tells your gauge how much gas is in your tank. I had a chevy truck and a blazer and both of them had this problem. I believe its a problem with all chevy models in my opinon. I would most definatly say that its your sending unit.

this is caused by a defective gas gage sending unit, the sending unit is part of the fuel pump module inside the gas tank, the gas tank must be removed to replace the fuel pump module that also contains the sending unit.

This is a common problem with Malibu's. It is due to cheap metal in the fuel gage that corrodes. Chevrolet knows about this but they refuse to issue a fix. The check engine light staying on and the faulty fuel gage are related. This is a defect and they need to recall this part! Raise hell with the dealership!

The sending unit in your tank is bad replace it, plus a new thermostat should sort it out!