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Google’s Channel Diagnostics for PMax, helps advertisers identify missing or disapproved assets that could limit performance.
Google is introducing a new Channel Diagnostics feature for Performance Max, giving advertisers a centralised view of asset issues that may be limiting campaign delivery across Google’s channels.
What’s happening. The new Channel Diagnostics section is now available within Insights & Reports > Channel Performance in Performance Max campaigns.
Advertisers can:
- View diagnostics across all Performance Max channels or drill into individual channels.
- Identify missing or disapproved assets affecting campaign eligibility.
- See exactly which asset types—such as headlines, descriptions, or images—need attention.
Why we care. Performance Max is often criticised for offering limited visibility into campaign issues. The new diagnostics tool makes it easier for advertisers to spot missing creative assets that could be preventing campaigns from serving across Search, Display, YouTube, Discover, Gmail, and Maps.
Between the lines. By surfacing channel-specific asset gaps in one place, Google is giving advertisers more actionable insights without requiring them to manually audit asset groups.
The bottom line. Channel Diagnostics gives Performance Max advertisers a quicker way to identify and fix missing assets, helping ensure campaigns remain eligible to serve across Google’s full range of inventory.
Spotted. This update was spotted by Google Ads Specialist who shared the update on LinkedIn.
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