I have same problem that even the dealer can't figure out.
your instrument cluster is either corroded and needs to be cleaned, or the circuitry on it is fried.
If the speedo in an 04 Monte Carlo doesnot work it is the stepper motor in the cluster. Go to eBay 04 Monte Carlo cluster stepper motors scroll down and by a set of motors .INSTRUTIONS COME WITH THEM TO REPLACE THEM vERY SIMPLE TO DO SO.
My dashpanel lights stopped working in your Chevy Monte Carlo ss 2001 what could the problem be
instrument cluster is shorted out or corroded
the location of the hazard lights is on top of the steering colum.
Cant you have to replace the entire radio
Cant you have to change the whole radio
Try a hammer.
look for a blown fuse.
usually the dash lights and taillights are on the same fuse.
you have a blown fuse not for sure which one but it is on the passenger side
If your 98 Monte Carlo brake lights do not work when you hit the brakes, but the top one behind the glass works, check the bulbs. If the bulbs have burn out, the lights will cease to work.