Why Your Google Ads PMax Campaigns Aren't Working (And What to Do About It)

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Are you pouring money into Google’s Performance Max (PMax) campaigns with disappointing results? You’re not alone. Many businesses, especially those with established Google Ads strategies, are scratching their heads wondering why PMax isn’t delivering the promised magic.

The PMax Promise vs. Reality

PMax is Google’s “AI-powered” campaign type that promises to simplify campaign management and maximize conversions. But the reality is often different, especially for mature advertisers.

Why PMax Fails for Experienced Advertisers

The core issue is that PMax often cannabalizes existing successful campaigns and inflates metrics without driving genuine incremental growth. Here’s why:

  • Redundant Targeting: PMax often ends up targeting users you’re already reaching effectively through your Search and Shopping campaigns. This leads to paying for clicks and interactions that would have happened anyway.
  • “In-Google-App” Activity: A significant portion of PMax activity can be attributed to “in-google-app” engagements, such as users clicking on map links or product pages within Google’s ecosystem. These interactions might not translate to meaningful conversions.
  • Lack of True Incrementality: While PMax might show increased clicks, impressions, and even conversions, these often don’t result in a tangible lift in overall business outcomes.

The Real Value of PMax

PMax does have its place, particularly for businesses new to Google Ads. Its automation features can simplify campaign setup and management, making it easier for businesses to get started.

Think of it this way: PMax is like a training-wheels version of Google Ads. It’s great for getting comfortable with the platform, but it can hold you back once you’re ready to take the reins.

What to Do Instead

  • Mature Advertisers: Focus on optimizing your existing Search and Shopping campaigns. Leverage granular control over targeting, bidding, and ad creatives to maximize efficiency and ROI. Consider using PMax strategically for specific goals, like grand awareness or reaching new customer segments.
  • New Advertisers: PMax can be a good starting point to gain familiarity with Google Ads. As you gain experience, gradually transition to more advanced campaign types to unlock greater control and performance.

Key Takeaways

  • PMax is not a magic bullet. It automates tasks, but it doesn’t replace strategic campaign management.
  • Mature advertisers often see limited incremental value. They’re already tapped into the power of Google’s core search advertising products.
  • New advertisers can benefit from its simplicity. It’s a good entry point for those new to Google Ads.

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About the Author

Matt Butler
Ex-Googler of 12 years, Matt was a founding member of Google’s analytical consulting team, developing analytics, statistical forecasting, auction modeling, and machine learning for companies such as Procter & Gamble, Coca-Cola, Unilever, Kohl’s, Best Buy, and many more. He went on to lead global technical partnerships before leaving to found Bonsai in February, 2020.