diff --git a/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx b/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx
index 986d54cb..595e3eca 100644
--- a/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx
+++ b/vehicle-data-platform/apps/web/src/pages/Vehicles.tsx
@@ -34,6 +34,18 @@ function sourceEvidenceText(row: VehicleCoverageRow) {
   return `${row.onlineSourceCount}/${row.sourceCount} 来源在线`;
 }
 
+function sourceDiagnosisText(row: VehicleCoverageRow) {
+  const parts = [sourceEvidenceText(row)];
+  if ((row.missingProtocols ?? []).length > 0) {
+    parts.push(`缺 ${row.missingProtocols.join('、')}`);
+  } else if (row.sourceCount > 0) {
+    parts.push('来源完整');
+  } else {
+    parts.push('暂无来源');
+  }
+  return parts.join('，');
+}
+
 function sourceConsistencyAction(row: VehicleCoverageRow, onFilter: (filters: Record<string, string>) => void) {
   const consistency = row.sourceConsistency;
   if (!consistency) {
@@ -180,6 +192,7 @@ export function Vehicles({
         width: 140,
         render: (_: unknown, row: VehicleCoverageRow) => sourceConsistencyAction(row, (nextFilters) => applyFilters({ ...filters, ...nextFilters }))
       },
+      { title: '诊断摘要', width: 240, render: (_: unknown, row: VehicleCoverageRow) => sourceDiagnosisText(row) },
       { title: '证据覆盖', width: 120, render: (_: unknown, row: VehicleCoverageRow) => sourceEvidenceText(row) },
       { title: '在线', width: 90, render: (_: unknown, row: VehicleCoverageRow) => <StatusTag status={row.online ? 'ok' : 'offline'} /> },
       { title: '最后在线', dataIndex: 'lastSeen', width: 170 },
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 ea864386..b67ca9e6 100644
--- a/vehicle-data-platform/apps/web/src/test/App.test.tsx
+++ b/vehicle-data-platform/apps/web/src/test/App.test.tsx
@@ -344,6 +344,7 @@ test('shows vehicle service result summary on vehicle list filters', async () =>
   expect(screen.getByText('JT808 离线')).toBeInTheDocument();
   expect(screen.getByText('YUTONG_MQTT 未接入')).toBeInTheDocument();
   expect(screen.getByText('1/2 来源在线')).toBeInTheDocument();
+  expect(screen.getByText('1/2 来源在线，缺 YUTONG_MQTT')).toBeInTheDocument();
 });
 
 test('filters vehicle list from result summary actions', async () => {