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.
Pmax Channel DiagnosticsPmax Channel Diagnostics

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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Anu AdegbolaAnu Adegbola
Anu Adegbola has been Paid Media Editor of Search Engine Land since 2024. She covers paid search, paid social, retail media, video and more.In 2008, Anu started her career delivering digital marketing campaigns (mostly but not exclusively Paid Search) by building strategies, maximising ROI, automating repetitive processes and bringing efficiency from every part of marketing departments through inspiring leadership both on agency, client and marketing tech side. Outside editing Search Engine Land article she is the founder of PPC networking event – PPC Live and host of weekly podcast PPC Live The Podcast.

She is also an international speaker with some of the stages she has presented on being SMX (US, UK, Munich, Berlin), Friends of Search (Amsterdam, NL), brightonSEO, The Marketing Meetup, HeroConf (PPC Hero), SearchLove, BiddableWorld, SESLondon, PPC Chat Live, AdWorld Experience (Bologna, IT) and more.


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Last Update: July 1, 2026