Why is my R2 Button not working?

So first of all I wanted to say that I have tried a lot before I ask this question now.


How it started: While I was playing Rocket League, I suddenly couldn't accelerate (R2 button). After the game, I tried pressing the button harder and tried all the other buttons as well.


Now to the real problem: My left stick can “replace” or “operate” the R2 button when I move it to the left.


So in a game, instead of using the R2 button, I can move the left stick to the left and it performs the move to the left and the R2 button, too.


So I did some research on what the problem could be and I firstly did reset the controller to default values via Windows, without success. Then I recalibrated the stick, again no success. With the sensors I could also see how my left stick can trigger the R2 button. When I push the left stick up to the left, the R2 button is triggered less and the further I go to the middle, the more the R2 button was pressed, so to speak.


After that I unscrewed the controller, took out the mainboard and cleaned the rubber thingies under the R2 / L2 buttons. I also took out the entire contact foil, cleaned it with alcohol and let it dry. I also took out the spring of the R2 button so that I had to apply less pressure to the button to trigger it. I also pressed the left side of the left stick (i.e. this green box, with a white plastic ring or something inside) open and cleaned the inside of the left side with alcohol.


So after I had replaced the rubbers, cleaned the foil, put it back in and connected the controller to my PC, there was a driver error at first. I waited 10 seconds or longer with the battery out and PC turned off, then I restarted my PC and reconnected my controller and it worked. So I started Rocket League again to see if my R2 button worked, it did not. Same problem as described above. So I ask you if this is still a hardware problem or if it could be solved with software?


The problem came out of nowhere, just like that, without any changes whatsoever (except gaming).

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