diff --git a/homeassistant/components/volvo/sensor.py b/homeassistant/components/volvo/sensor.py
index a067549f068..7f37ac42dc8 100644
--- a/homeassistant/components/volvo/sensor.py
+++ b/homeassistant/components/volvo/sensor.py
@@ -107,6 +107,7 @@ _DESCRIPTIONS: tuple[VolvoSensorDescription, ...] = (
             "power_saving_mode",
         ],
         value_fn=_availability_status,
+        entity_category=EntityCategory.DIAGNOSTIC,
     ),
     # statistics endpoint
     VolvoSensorDescription(
diff --git a/tests/components/volvo/snapshots/test_sensor.ambr b/tests/components/volvo/snapshots/test_sensor.ambr
index 29e7e1e72a5..e218986517a 100644
--- a/tests/components/volvo/snapshots/test_sensor.ambr
+++ b/tests/components/volvo/snapshots/test_sensor.ambr
@@ -128,7 +128,7 @@
     'device_id': <ANY>,
     'disabled_by': None,
     'domain': 'sensor',
-    'entity_category': None,
+    'entity_category': <EntityCategory.DIAGNOSTIC: 'diagnostic'>,
     'entity_id': 'sensor.volvo_ex30_car_connection',
     'has_entity_name': True,
     'hidden_by': None,
@@ -1163,7 +1163,7 @@
     'device_id': <ANY>,
     'disabled_by': None,
     'domain': 'sensor',
-    'entity_category': None,
+    'entity_category': <EntityCategory.DIAGNOSTIC: 'diagnostic'>,
     'entity_id': 'sensor.volvo_s90_car_connection',
     'has_entity_name': True,
     'hidden_by': None,
@@ -1951,7 +1951,7 @@
     'device_id': <ANY>,
     'disabled_by': None,
     'domain': 'sensor',
-    'entity_category': None,
+    'entity_category': <EntityCategory.DIAGNOSTIC: 'diagnostic'>,
     'entity_id': 'sensor.volvo_xc40_car_connection',
     'has_entity_name': True,
     'hidden_by': None,
@@ -3151,7 +3151,7 @@
     'device_id': <ANY>,
     'disabled_by': None,
     'domain': 'sensor',
-    'entity_category': None,
+    'entity_category': <EntityCategory.DIAGNOSTIC: 'diagnostic'>,
     'entity_id': 'sensor.volvo_xc60_car_connection',
     'has_entity_name': True,
     'hidden_by': None,
@@ -4012,7 +4012,7 @@
     'device_id': <ANY>,
     'disabled_by': None,
     'domain': 'sensor',
-    'entity_category': None,
+    'entity_category': <EntityCategory.DIAGNOSTIC: 'diagnostic'>,
     'entity_id': 'sensor.volvo_xc90_car_connection',
     'has_entity_name': True,
     'hidden_by': None,