[Ryan52]

Lucidry, have you found a fix for this yet? I'm having the exact same problem on my 2016 Forester. So far, two mechanics have been unable to come up with any solutions other than replacing the flasher module, which did not help.

 

[Ryan52]

I think the third mechanic I tried has solved the issue for me. I haven't had any problems for the last 1-2 weeks. He found a corroded connector on a wire running to the rear gate control module from pin 8 on the hazard module (white/green wire). This must have been intermittently pulling the line to ground.

The connector is located behind a cover on the floor beside the driver's left foot. I think all he did was clean up the connection a bit and it's been working fine since then.