I installed a stereo in my 2003 chevy Malibu and now my temperature and gas gauge doesn't work. What did I do wrong?

Do wipers work? Possible ignition switch. Jiggle key while running and see if anything changes

should work as soon as the thermostat starts to open.

Well you've lost power to one or two major circuits. Could be a problem with the key switch or a major fuse in the engine compartment.
I would check the fuses for power and find out which ones are dead then go from there.

Check the Instrument Cluster Fuse... I am willing to bet that is the problem

Sounds like the battery is weak. If it is older, replace it. If the module is bad it would'nt start at all.

check fuses. did this happen all of the sudden? did you or someone recently change the stereo, reason I ask this is there is a continuous power wire that connects the factory stereo to the guage panel usually a yellow wire, and if it's no longer connected or incorrectly connected then that would cause your gauges not to work

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

Need to replace the sensor inside the gas tank. I have a 2008 Malibu with the same problem. It was a faulty fuel gauge sensor.

Hello! see diagram below...It has a two wire connector with wire colors Yellow and Orange/Black...

Guru................Saailer



I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Just had a new fuel pump installed in 2002 Chevy Malibu. Worked great for about a week and then the fuel gauge started reading "empty" when the car has a full tank of gas. What happened?