Best Answer

Brake Lights Troubleshooting (check in this order):

1. Check Fuse

2. Check Bulbs

3. Check switch on brake pedal

4. Check license plate light bulb and wiring

5. Check trailer hitch wiring harness

Most likely its the fuse or bulb. See sources and related links below for bulb information.

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Q: How do you check brake lights on a 2005 gmc canyon?
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