Turn signal starts flashing quickly?

2021 GMC CANYON
60,000 MILES • 3.6L • V6 • 4WD • AUTOMATIC
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VITOKOTLETKA
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Hi, I have a problem, when I turn the indicator to the left or right, after three flashes, the indicator light starts flashing quickly, if I turn on the hazard lights, they flash as they should. Everything on the car is original, even the bulbs are still original, the car has low mileage and there is no one here in the Czech Republic who can help me with the problem. Thank you for your answer.
Feb 16, 2025 at 8:20 AM
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STEVE W.
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Turn on the left side, now get out and look at the actual lights. This normally indicates a bad bulb. Check those first.
Feb 17, 2025 at 10:13 PM
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STRAILER
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I have seen a blown fuse on the BCM cause this issue. Here are the names of fuses int eh diagrams below and a guide to help you check them. The fuse locations are included in the images below as well.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the images (below). Please let us know what happens.
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Feb 19, 2025 at 5:18 PM
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VITOKOTLETKA
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Hi, I came across a problem. The problem is that the mud from the rear wheel gets directly from the inside onto the rear headlight and as a result the wiring from the Canbus resistors broke and that will probably be the whole problem. So, I'll install some covers there and replace the Canbuses. Thank you all.
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Feb 20, 2025 at 2:22 AM
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STRAILER
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Yep, that will do it good find! Thanks for letting us know, we are here to help, please use 2CarPros anytime.
Feb 20, 2025 at 10:03 AM
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STEVE W.
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Not stock parts then. It is not uncommon to find failures with aftermarket parts. I would go over the fronts as well and check any other additions for corrosion.
Feb 20, 2025 at 3:23 PM