Your vehicle does not have a traditional flasher relay but this is not an uncommon issue. The BCM is what controls the turn signals and the flasher and when the BCM fails internally, the lights at odd when using the turn signals.
If it were me, I would replace the BCM and then go from there.
Below is the wiring diagram and the instructions on how to replace the BCM. Let us know if you need more info. Thanks
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Thursday, February 4th, 2021 AT 8:34 PM