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How to Replace the Rear Signal Lights in a Chevy Cobalt

by Contributor

Driving with a broken rear signal light increases your chance of being rear-ended by another driver. To avoid accidents and other mishaps, quickly replace the signal lights in your Chevy Cobalt as soon as they burn out. With the right replacement bulb in hand, the repair only takes a couple of minutes to complete.

Step 1

Set the parking brake and pull the keys out of the ignition. Open the trunk using the driver's side trunk release latch, or by manually unlocking it.

Step 2

Detach the fastener holding the trunk trim to the inside of the trunk.

Step 3

Remove the outer screws holding the taillight assembly to the car's body.

Step 4

Disconnect the wiring harness by lifting up on the tab and pulling it straight out of the assembly. Once the wires are clear, pull the assembly out of the quarter panel.

Step 5

Turn the faulty bulb's socket counterclockwise to remove it from the assembly.

Step 6

Pull the bulb directly out the socket, and then replace it with the new one. Reconnect the socket to the assembly and replace the wiring harness.

Test the signal light to make sure it works. If it lights up, screw the taillight assembly back onto the car, replace the trunk trim and close the trunk.


  • Check the rear combination light diagram in Section 5 of your Cobalt Owner's Manual if you're unsure about which bulb to remove.

Items you will need

  • #3057KX replacement bulb
  • Screwdriver

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