I am not positive on the 2001, but most reverse lamp switches are in the transmission range sensor or (manual lever positioning sensor) where the shifter cable is attached to the transmission.
Check Fuses, Replace Bulbs, Replace Shift Position Sensor. End of solution
Did you recently change or install something in your car like a stereo or GPS?
Check the backup light switch.
What is the part number for the 2008 HHR tail light bulbs and backup light bulbs?
194 bulbs you can get them from any advance auto
You have to remove the the tailgate trim to access the bulb.
Check bulbs and switch
the bulbs are probably burnt out, though it could be a bad connection or sensor or fuse or sveral other things. check the bulbs and fuse first though check your bulbs, fuses, and connections,
blinker blubs on a 1997 f150 front blubs
Doesn't need a lot of moisture inside a headlight to blow bulbs especially halogen type.
There are a couple of bulbs in the taillight: turn, brake & backup.See "Related Questions" below for a Taurus/Sable lightbulb-round-up...
Change brake light bulbs Just remove the rear license plate. You can change the backup lights and brake light easily.