diff --git a/homeassistant/components/tesla_fleet/__init__.py b/homeassistant/components/tesla_fleet/__init__.py
index 70db4a183aa..e7030b568b3 100644
--- a/homeassistant/components/tesla_fleet/__init__.py
+++ b/homeassistant/components/tesla_fleet/__init__.py
@@ -134,7 +134,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: TeslaFleetConfigEntry) -
             signing = product["command_signing"] == "required"
             if signing:
                 if not tesla.private_key:
-                    await tesla.get_private_key("config/tesla_fleet.key")
+                    await tesla.get_private_key(hass.config.path("tesla_fleet.key"))
                 api = VehicleSigned(tesla.vehicle, vin)
             else:
                 api = VehicleSpecific(tesla.vehicle, vin)
diff --git a/tests/components/tesla_fleet/test_button.py b/tests/components/tesla_fleet/test_button.py
index 07fdc962be9..ef1cfd90357 100644
--- a/tests/components/tesla_fleet/test_button.py
+++ b/tests/components/tesla_fleet/test_button.py
@@ -77,9 +77,13 @@ async def test_press_signing_error(
     new_product["response"][0]["command_signing"] = "required"
     mock_products.return_value = new_product
 
-    await setup_platform(hass, normal_config_entry, [Platform.BUTTON])
+    with (
+        patch("homeassistant.components.tesla_fleet.TeslaFleetApi.get_private_key"),
+    ):
+        await setup_platform(hass, normal_config_entry, [Platform.BUTTON])
 
     with (
+        patch("homeassistant.components.tesla_fleet.TeslaFleetApi.get_private_key"),
         patch(
             "homeassistant.components.tesla_fleet.VehicleSigned.flash_lights",
             side_effect=NotOnWhitelistFault,