diff --git a/vehicle-data-platform/apps/api/internal/platform/handler_test.go b/vehicle-data-platform/apps/api/internal/platform/handler_test.go
index 7c455ca3..3be9c876 100644
--- a/vehicle-data-platform/apps/api/internal/platform/handler_test.go
+++ b/vehicle-data-platform/apps/api/internal/platform/handler_test.go
@@ -159,6 +159,9 @@ func TestHandlerVehicleCoverageTreatsMissingCanonicalSourceAsDegraded(t *testing
 		if row.ServiceStatus == nil || row.ServiceStatus.Status != "degraded" {
 			t.Fatalf("missing canonical source should degrade vehicle service, got row=%+v body=%s", row, rec.Body.String())
 		}
+		if row.ServiceStatus.Title != "来源不完整" {
+			t.Fatalf("missing canonical source should use explicit incomplete-source title, got row=%+v body=%s", row, rec.Body.String())
+		}
 	}
 }
 
@@ -410,6 +413,9 @@ func TestHandlerVehicleServiceSummaryEndpoint(t *testing.T) {
 	}
 	noDataStatusFound := false
 	for _, status := range body.Data.ServiceStatuses {
+		if status.Status == "degraded" && status.Title != "来源异常" {
+			t.Fatalf("summary degraded status should use broad source exception title, got %+v", status)
+		}
 		if status.Status == "no_data" {
 			noDataStatusFound = true
 			if status.Title != "暂无数据来源" || status.Count != body.Data.NoDataVehicles {
diff --git a/vehicle-data-platform/apps/api/internal/platform/mock_store.go b/vehicle-data-platform/apps/api/internal/platform/mock_store.go
index 26374e4f..782a21a0 100644
--- a/vehicle-data-platform/apps/api/internal/platform/mock_store.go
+++ b/vehicle-data-platform/apps/api/internal/platform/mock_store.go
@@ -46,7 +46,7 @@ func (m *MockStore) DashboardSummary(context.Context) (DashboardSummary, error)
 		},
 		ServiceStatuses: []ServiceStatusStat{
 			{Status: "healthy", Title: "服务正常", Count: 2},
-			{Status: "degraded", Title: "部分来源离线", Count: 1},
+			{Status: "degraded", Title: "来源异常", Count: 1},
 			{Status: "offline", Title: "车辆离线", Count: 1},
 			{Status: "identity_required", Title: "身份未绑定", Count: 0},
 		},
@@ -184,7 +184,7 @@ func (m *MockStore) VehicleServiceSummary(ctx context.Context) (VehicleServiceSu
 	}
 	statusCounts := map[string]*ServiceStatusStat{
 		"healthy":           {Status: "healthy", Title: "服务正常"},
-		"degraded":          {Status: "degraded", Title: "部分来源离线"},
+		"degraded":          {Status: "degraded", Title: "来源异常"},
 		"offline":           {Status: "offline", Title: "车辆离线"},
 		"no_data":           {Status: "no_data", Title: "暂无数据来源"},
 		"identity_required": {Status: "identity_required", Title: "身份未绑定"},
diff --git a/vehicle-data-platform/apps/api/internal/platform/production_store.go b/vehicle-data-platform/apps/api/internal/platform/production_store.go
index 331b25cb..8a024fcd 100644
--- a/vehicle-data-platform/apps/api/internal/platform/production_store.go
+++ b/vehicle-data-platform/apps/api/internal/platform/production_store.go
@@ -76,7 +76,7 @@ func (s *ProductionStore) DashboardSummary(ctx context.Context) (DashboardSummar
 func (s *ProductionStore) serviceStatusStats(ctx context.Context) ([]ServiceStatusStat, error) {
 	definitions := []ServiceStatusStat{
 		{Status: "healthy", Title: "服务正常"},
-		{Status: "degraded", Title: "部分来源离线"},
+		{Status: "degraded", Title: "来源异常"},
 		{Status: "offline", Title: "车辆离线"},
 		{Status: "no_data", Title: "暂无数据来源"},
 		{Status: "identity_required", Title: "身份未绑定"},
@@ -149,7 +149,7 @@ GROUP BY v.vin
 	}
 	summary.ServiceStatuses = []ServiceStatusStat{
 		{Status: "healthy", Title: "服务正常", Count: healthy},
-		{Status: "degraded", Title: "部分来源离线", Count: degraded},
+		{Status: "degraded", Title: "来源异常", Count: degraded},
 		{Status: "offline", Title: "车辆离线", Count: offline},
 		{Status: "no_data", Title: "暂无数据来源", Count: summary.NoDataVehicles},
 		{Status: "identity_required", Title: "身份未绑定", Count: summary.IdentityRequiredVehicles},
diff --git a/vehicle-data-platform/apps/api/internal/platform/service.go b/vehicle-data-platform/apps/api/internal/platform/service.go
index 93630b3f..90b192b3 100644
--- a/vehicle-data-platform/apps/api/internal/platform/service.go
+++ b/vehicle-data-platform/apps/api/internal/platform/service.go
@@ -970,6 +970,16 @@ func buildVehicleCoverageServiceStatus(row VehicleCoverageRow) *VehicleServiceSt
 			OnlineSourceCount: row.OnlineSourceCount,
 		}
 	}
+	if len(row.MissingProtocols) > 0 {
+		return &VehicleServiceStatus{
+			Status:            "degraded",
+			Severity:          "warning",
+			Title:             "来源不完整",
+			Detail:            sourceCoverageDetail(row.SourceCount, row.OnlineSourceCount, "车辆服务可用但缺少 "+strings.Join(row.MissingProtocols, "、")+" 来源。"),
+			SourceCount:       row.SourceCount,
+			OnlineSourceCount: row.OnlineSourceCount,
+		}
+	}
 	if row.OnlineSourceCount < row.SourceCount {
 		return &VehicleServiceStatus{
 			Status:            "degraded",
@@ -980,16 +990,6 @@ func buildVehicleCoverageServiceStatus(row VehicleCoverageRow) *VehicleServiceSt
 			OnlineSourceCount: row.OnlineSourceCount,
 		}
 	}
-	if len(row.MissingProtocols) > 0 {
-		return &VehicleServiceStatus{
-			Status:            "degraded",
-			Severity:          "warning",
-			Title:             "部分来源离线",
-			Detail:            sourceCoverageDetail(row.SourceCount, row.OnlineSourceCount, "车辆服务可用但缺少 "+strings.Join(row.MissingProtocols, "、")+" 来源。"),
-			SourceCount:       row.SourceCount,
-			OnlineSourceCount: row.OnlineSourceCount,
-		}
-	}
 	return &VehicleServiceStatus{
 		Status:            "healthy",
 		Severity:          "ok",
diff --git a/vehicle-data-platform/apps/web/src/App.tsx b/vehicle-data-platform/apps/web/src/App.tsx
index 2859ac83..c8db398e 100644
--- a/vehicle-data-platform/apps/web/src/App.tsx
+++ b/vehicle-data-platform/apps/web/src/App.tsx
@@ -268,7 +268,7 @@ function serviceStatusFromOverview(overview: VehicleServiceOverview): VehicleSer
     return {
       status: 'degraded',
       severity: 'warning',
-      title: '部分来源离线',
+      title: '来源异常',
       detail: `${onlineSourceCount}/${sourceCount} 个来源在线，车辆服务可用但需要关注离线来源。`,
       sourceCount,
       onlineSourceCount
diff --git a/vehicle-data-platform/apps/web/src/pages/Dashboard.tsx b/vehicle-data-platform/apps/web/src/pages/Dashboard.tsx
index 9939e90e..4165959c 100644
--- a/vehicle-data-platform/apps/web/src/pages/Dashboard.tsx
+++ b/vehicle-data-platform/apps/web/src/pages/Dashboard.tsx
@@ -23,7 +23,7 @@ const serviceStatusColor: Record<string, 'green' | 'orange' | 'red' | 'grey'> =
 
 const serviceStatusTitle: Record<string, string> = {
   healthy: '服务正常',
-  degraded: '部分来源离线',
+  degraded: '来源异常',
   offline: '车辆离线',
   no_data: '暂无数据来源',
   identity_required: '身份未绑定'
@@ -54,7 +54,7 @@ function rowServiceStatus(row: { serviceStatus?: { title: string; severity: stri
     return { label: '车辆离线', color: 'red' as const };
   }
   if (row.onlineSourceCount < row.sourceCount) {
-    return { label: '部分来源离线', color: 'orange' as const };
+    return { label: '来源异常', color: 'orange' as const };
   }
   return { label: '服务正常', color: 'green' as const };
 }
@@ -275,7 +275,7 @@ export function Dashboard({ onOpenVehicle, onOpenQuality, onOpenVehicles }: { on
             </Form.Select>
             <Form.Select field="serviceStatus" label="服务状态" placeholder="全部" style={{ width: 150 }} data-testid="dashboard-service-status-filter">
               <Select.Option value="healthy">服务正常</Select.Option>
-              <Select.Option value="degraded">部分来源离线</Select.Option>
+              <Select.Option value="degraded">来源异常</Select.Option>
               <Select.Option value="offline">车辆离线</Select.Option>
               <Select.Option value="no_data">暂无数据来源</Select.Option>
               <Select.Option value="identity_required">身份未绑定</Select.Option>
diff --git a/vehicle-data-platform/apps/web/src/pages/Realtime.tsx b/vehicle-data-platform/apps/web/src/pages/Realtime.tsx
index 60cf757a..688b695b 100644
--- a/vehicle-data-platform/apps/web/src/pages/Realtime.tsx
+++ b/vehicle-data-platform/apps/web/src/pages/Realtime.tsx
@@ -22,7 +22,7 @@ function vehicleServiceStatus(row: VehicleRealtimeRow) {
     return { label: '车辆离线', color: 'red' as const };
   }
   if (row.onlineSourceCount < row.sourceCount) {
-    return { label: '部分来源离线', color: 'orange' as const };
+    return { label: '来源异常', color: 'orange' as const };
   }
   return { label: '服务正常', color: 'green' as const };
 }
@@ -78,7 +78,7 @@ export function Realtime({ onOpenVehicle }: { onOpenVehicle: (vin: string, proto
           </Form.Select>
           <Form.Select field="serviceStatus" label="服务状态" placeholder="全部" style={{ width: 150 }}>
             <Select.Option value="healthy">服务正常</Select.Option>
-            <Select.Option value="degraded">部分来源离线</Select.Option>
+            <Select.Option value="degraded">来源异常</Select.Option>
             <Select.Option value="offline">车辆离线</Select.Option>
             <Select.Option value="identity_required">身份未绑定</Select.Option>
           </Form.Select>
diff --git a/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx b/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx
index ca774597..f37213f0 100644
--- a/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx
+++ b/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx
@@ -24,7 +24,7 @@ function vehicleServiceStatus(row: VehicleCoverageRow) {
     return { label: '车辆离线', color: 'red' as const };
   }
   if (row.onlineSourceCount < row.sourceCount) {
-    return { label: '部分来源离线', color: 'orange' as const };
+    return { label: '来源异常', color: 'orange' as const };
   }
   return { label: '服务正常', color: 'green' as const };
 }
@@ -170,7 +170,7 @@ export function Vehicles({
           </Form.Select>
           <Form.Select field="serviceStatus" label="服务状态" placeholder="全部" style={{ width: 150 }} data-testid="service-status-filter">
             <Select.Option value="healthy">服务正常</Select.Option>
-            <Select.Option value="degraded">部分来源离线</Select.Option>
+            <Select.Option value="degraded">来源异常</Select.Option>
             <Select.Option value="offline">车辆离线</Select.Option>
             <Select.Option value="no_data">暂无数据来源</Select.Option>
             <Select.Option value="identity_required">身份未绑定</Select.Option>
diff --git a/vehicle-data-platform/apps/web/src/test/App.test.tsx b/vehicle-data-platform/apps/web/src/test/App.test.tsx
index d2216a99..e729122f 100644
--- a/vehicle-data-platform/apps/web/src/test/App.test.tsx
+++ b/vehicle-data-platform/apps/web/src/test/App.test.tsx
@@ -817,13 +817,13 @@ test('filters dashboard coverage by service status', async () => {
 
   expect(await screen.findByText('车辆服务覆盖')).toBeInTheDocument();
   fireEvent.click(screen.getByTestId('dashboard-service-status-filter'));
-  fireEvent.click(await screen.findByText('部分来源离线'));
+  fireEvent.click(await screen.findByText('来源异常'));
   fireEvent.click(screen.getByRole('button', { name: '筛选' }));
 
   await waitFor(() => {
     expect(fetchMock).toHaveBeenCalledWith(expect.stringContaining('serviceStatus=degraded'), undefined);
   });
-  expect(screen.getByText('当前筛选：部分来源离线')).toBeInTheDocument();
+  expect(screen.getByText('当前筛选：来源异常')).toBeInTheDocument();
 });
 
 test('filters dashboard coverage by missing source evidence', async () => {
@@ -1284,7 +1284,7 @@ test('shows vehicle context when opening detail from shareable hash', async () =
   render(<App />);
 
   expect(await screen.findByText('粤AG18312 / VIN001')).toBeInTheDocument();
-  expect(screen.getByText('当前车辆：部分来源离线')).toBeInTheDocument();
+  expect(screen.getByText('当前车辆：来源异常')).toBeInTheDocument();
 });
 
 test('refreshes vehicle context when hash changes to another detail vehicle', async () => {
@@ -1983,7 +1983,7 @@ test('filters vehicle list by service status', async () => {
 
   await screen.findByRole('heading', { name: '车辆服务' });
   fireEvent.click(screen.getByTestId('service-status-filter'));
-  fireEvent.click(await screen.findByText('部分来源离线'));
+  fireEvent.click(await screen.findByText('来源异常'));
   fireEvent.click(screen.getByRole('button', { name: '查询' }));
 
   await waitFor(() => {