The 2010 GMC Sierra does not have a separate flasher. The turn signal function is built into the body control module. You cannot replace the flasher alone. If you have a scan tool, you can connect to the DLC and see if the turn signal switch command is being received by the BCM.
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The 2010 GMC Sierra does not have a separate flasher. The turn signal function is built into the body control module. You cannot replace the flasher alone. If you have a scan tool, you can connect to the DLC and see if the turn signal switch command is being received by the BCM.