Diagnostic matrix
| Observed signal | Likely branch | First check |
|---|---|---|
| Account notice names Limited Ad Serving | Advertiser qualification | Review verification, identity, domain and the dedicated policy guidance. |
| Ads are under review or disapproved | Ad or asset policy | Open Policy Manager and inspect the exact affected entity. |
| Several campaigns stop after a payment event | Billing or account administration | Check payments, suspension notices and account access. |
| Eligible campaigns have low search volume | Demand or targeting | Inspect keyword status, locations, audiences, language and schedule. |
| Traffic falls after a bid or budget change | Delivery constraint | Review change history, targets, budgets, auction coverage and learning state. |
| Conversion-focused campaign cannot learn | Measurement or goal configuration | Verify primary goals, recent volume and tracking health. |
Five-step decision tree
Confirm the symptom
Compare impressions, eligible status and affected scope before and after the drop. Determine whether the issue is account-wide, campaign-specific or limited to certain surfaces.
Check explicit notices
Read the account notification, Policy Manager, billing alerts and verification status. Do not infer a named policy from volume alone.
Rule out delivery constraints
Check budget, bid targets, targeting, negative keywords, scheduling, audience restrictions, demand and recent edits.
Inspect policy and trust signals
Confirm advertiser identity, business relationships, domain clarity, landing-page transparency and whether user expectations match the offer.
Choose the smallest recovery action
Fix the evidenced issue, document the change, allow the relevant review or learning window, and appeal only through the appropriate route.
What not to do
Do not rebuild blindly
A new campaign does not resolve an advertiser-level restriction and can erase useful diagnostic history.
Do not loosen everything
Broader targeting and higher bids can hide the original cause while increasing waste.
Do not confuse approval with reach
Approval confirms one policy state; it does not guarantee auction eligibility or volume.
Do not promise a timetable
Recovery depends on the cause, review path and account evidence. Avoid invented thresholds.
Evidence log
- Date and time the delivery change became visible.
- Affected accounts, campaigns, channels and countries.
- Exact notice or policy text and the surface where it appeared.
- Change-history events before the decline.
- Billing, verification, conversion and landing-page status.
- Action taken, expected review window and next observation date.
FAQ
Do zero impressions prove Limited Ad Serving?
No. Zero or low impressions can also result from billing, bids, budget, targeting, demand, review status, conversion settings or other policies. Look for the relevant account notice and rule out alternatives.
Can an approved Google ad still have limited reach?
Yes. Ad-level approval and advertiser-level qualification are different checks, and other delivery constraints can also restrict an approved ad.
Read the policy boundary first
Use the source-checked Limited Ad Serving guide, then compare account changes with the Change Impact Analyzer.