2012 Buick turn signal problems

[That Buick guy]

Hi, I have a 2012 Buick regal 116k miles and the rear turn signal bulb on the drivers side has gone out I had the problem before I replaced the tail light assembly and the problem is continuing. I put a new bulb in it yesterday and it still dosent work, I use the signal it it goes very fast when I use the signal but the bulb won’t work, the front one works just fine but the rear one won’t, so what do I do.

 

[bugspop1]

This is what the Google AI said:

Your turn signal is blinking fast because the system detects a problem with the electrical circuit, most commonly a burned-out bulb on the side that is flashing quickly.. Other possible causes include a bad ground connection, faulty or incompatible aftermarket bulbs, a damaged socket or wiring, or a failing flasher relay. To fix it, first inspect the bulbs and replace any that are out, then check wiring and connections, and if the problem persists, consider replacing the flasher relay or consulting a mechanic.