Remove the left thumbstick.

Replacement thumbsticks require calibration to work as expected. To calibrate new thumbsticks, follow this calibration guide.

Each Steam Deck ships with one of two different models of thumbsticks, Type A or Type B. Although nearly identical, capacitive touch capability relies on the correct type to be installed.

To identify which replacement thumbsticks you need, navigate to Settings → System and check the Steam Deck Controller ID.

If the Controller ID starts with "MEDA" that device needs Type A thumbsticks.

If the Controller ID starts with "MHDA" that device needs Type B thumbsticks.