diff --git a/tests/components/modbus/conftest.py b/tests/components/modbus/conftest.py
index f6eff0fd64b..62cf12958d3 100644
--- a/tests/components/modbus/conftest.py
+++ b/tests/components/modbus/conftest.py
@@ -52,6 +52,15 @@ def mock_pymodbus_fixture():
     """Mock pymodbus."""
     mock_pb = mock.AsyncMock()
     mock_pb.close = mock.MagicMock()
+    read_result = ReadResult([])
+    mock_pb.read_coils.return_value = read_result
+    mock_pb.read_discrete_inputs.return_value = read_result
+    mock_pb.read_input_registers.return_value = read_result
+    mock_pb.read_holding_registers.return_value = read_result
+    mock_pb.write_register.return_value = read_result
+    mock_pb.write_registers.return_value = read_result
+    mock_pb.write_coil.return_value = read_result
+    mock_pb.write_coils.return_value = read_result
     with (
         mock.patch(
             "homeassistant.components.modbus.modbus.AsyncModbusTcpClient",
@@ -156,7 +165,7 @@ async def mock_pymodbus_exception_fixture(hass, do_exception, mock_modbus):
 @pytest.fixture(name="mock_pymodbus_return")
 async def mock_pymodbus_return_fixture(hass, register_words, mock_modbus):
     """Trigger update call with time_changed event."""
-    read_result = ReadResult(register_words) if register_words else None
+    read_result = ReadResult(register_words if register_words else [])
     mock_modbus.read_coils.return_value = read_result
     mock_modbus.read_discrete_inputs.return_value = read_result
     mock_modbus.read_input_registers.return_value = read_result
@@ -165,6 +174,7 @@ async def mock_pymodbus_return_fixture(hass, register_words, mock_modbus):
     mock_modbus.write_registers.return_value = read_result
     mock_modbus.write_coil.return_value = read_result
     mock_modbus.write_coils.return_value = read_result
+    return mock_modbus
 
 
 @pytest.fixture(name="mock_do_cycle")
diff --git a/tests/components/modbus/fixtures/configuration.yaml b/tests/components/modbus/fixtures/configuration.yaml
index 0f12ac88686..0a16d85e39d 100644
--- a/tests/components/modbus/fixtures/configuration.yaml
+++ b/tests/components/modbus/fixtures/configuration.yaml
@@ -3,3 +3,7 @@ modbus:
   host: "testHost"
   port: 5001
   name: "testModbus"
+  sensors:
+    - name: "dummy"
+      address: 117
+      slave: 0
diff --git a/tests/components/modbus/test_init.py b/tests/components/modbus/test_init.py
index 922022741b0..f0dfd5357e7 100644
--- a/tests/components/modbus/test_init.py
+++ b/tests/components/modbus/test_init.py
@@ -1645,7 +1645,7 @@ async def test_shutdown(
     ],
 )
 async def test_stop_restart(
-    hass: HomeAssistant, caplog: pytest.LogCaptureFixture, mock_modbus
+    hass: HomeAssistant, caplog: pytest.LogCaptureFixture, mock_pymodbus_return
 ) -> None:
     """Run test for service stop."""
 
@@ -1656,7 +1656,7 @@ async def test_stop_restart(
     await hass.async_block_till_done()
     assert hass.states.get(entity_id).state == "17"
 
-    mock_modbus.reset_mock()
+    mock_pymodbus_return.reset_mock()
     caplog.clear()
     data = {
         ATTR_HUB: TEST_MODBUS_NAME,
@@ -1664,23 +1664,23 @@ async def test_stop_restart(
     await hass.services.async_call(DOMAIN, SERVICE_STOP, data, blocking=True)
     await hass.async_block_till_done()
     assert hass.states.get(entity_id).state == STATE_UNAVAILABLE
-    assert mock_modbus.close.called
+    assert mock_pymodbus_return.close.called
     assert f"modbus {TEST_MODBUS_NAME} communication closed" in caplog.text
 
-    mock_modbus.reset_mock()
+    mock_pymodbus_return.reset_mock()
     caplog.clear()
     await hass.services.async_call(DOMAIN, SERVICE_RESTART, data, blocking=True)
     await hass.async_block_till_done()
-    assert not mock_modbus.close.called
-    assert mock_modbus.connect.called
+    assert not mock_pymodbus_return.close.called
+    assert mock_pymodbus_return.connect.called
     assert f"modbus {TEST_MODBUS_NAME} communication open" in caplog.text
 
-    mock_modbus.reset_mock()
+    mock_pymodbus_return.reset_mock()
     caplog.clear()
     await hass.services.async_call(DOMAIN, SERVICE_RESTART, data, blocking=True)
     await hass.async_block_till_done()
-    assert mock_modbus.close.called
-    assert mock_modbus.connect.called
+    assert mock_pymodbus_return.close.called
+    assert mock_pymodbus_return.connect.called
     assert f"modbus {TEST_MODBUS_NAME} communication closed" in caplog.text
     assert f"modbus {TEST_MODBUS_NAME} communication open" in caplog.text
 
@@ -1710,7 +1710,7 @@ async def test_write_no_client(hass: HomeAssistant, mock_modbus) -> None:
 async def test_integration_reload(
     hass: HomeAssistant,
     caplog: pytest.LogCaptureFixture,
-    mock_modbus,
+    mock_pymodbus_return,
     freezer: FrozenDateTimeFactory,
 ) -> None:
     """Run test for integration reload."""
@@ -1731,7 +1731,7 @@ async def test_integration_reload(
 
 @pytest.mark.parametrize("do_config", [{}])
 async def test_integration_reload_failed(
-    hass: HomeAssistant, caplog: pytest.LogCaptureFixture, mock_modbus
+    hass: HomeAssistant, caplog: pytest.LogCaptureFixture, mock_pymodbus_return
 ) -> None:
     """Run test for integration connect failure on reload."""
     caplog.set_level(logging.INFO)
@@ -1740,7 +1740,9 @@ async def test_integration_reload_failed(
     yaml_path = get_fixture_path("configuration.yaml", "modbus")
     with (
         mock.patch.object(hass_config, "YAML_CONFIG_FILE", yaml_path),
-        mock.patch.object(mock_modbus, "connect", side_effect=ModbusException("error")),
+        mock.patch.object(
+            mock_pymodbus_return, "connect", side_effect=ModbusException("error")
+        ),
     ):
         await hass.services.async_call(DOMAIN, SERVICE_RELOAD, blocking=True)
         await hass.async_block_till_done()
@@ -1751,7 +1753,7 @@ async def test_integration_reload_failed(
 
 @pytest.mark.parametrize("do_config", [{}])
 async def test_integration_setup_failed(
-    hass: HomeAssistant, caplog: pytest.LogCaptureFixture, mock_modbus
+    hass: HomeAssistant, caplog: pytest.LogCaptureFixture, mock_pymodbus_return
 ) -> None:
     """Run test for integration setup on reload."""
     with mock.patch.object(