If you’re running Google Ads, you’ll know the feeling of checking your numbers and seeing okay results but never anything amazing. What you don’t know is that your account has been missing most of your conversions for months.
Every website now has a cookie pop-up where visitors give feedback on if they consent to being tracked. What you may not know is that every click ‘no’. May have been quietly deleting data from your Google Ads account. If this sounds like you, you’re not alone and the fix is easier than you think!
What happens when someone clicks “Reject”?
Nearly 65% of web visitors click reject to be tracked. Often this means when a visitor lands on your site, and declines cookies, your Google tracking goes dark. Google records nothing from the visit – no sale, enquiry or sign-up. It’s as if the person never visited your site altogether.
When we put this in the context of Google ads, Google’s Smart Bidding, the automatic system deciding how much to bid for each click, and who to show your ads to, learns from your conversions. As it has more data it gets smarter, as it knows who is most likely to convert. But if it’s missing nearly two thirds of your actual results, it’s not learning from your real customers. It’s learning from a fraction of them.
What does Consent Mode V2 actually do?
Google’s solution to this was to introduce Consent Mode V2, specifically the ‘advanced’ version. This is a technical configuration that changes how your tracking works for visitors who decline cookies.
With this in place, instead of all tracking going silent when someone rejects tracking, it sends an anonymous, privacy-safe signal to Google. This will not include any personal data or individual identification. It simply says to Google “A visit happened here” or “A conversion came through here”.
Google then takes all of these anonymous signals across all of your traffic, and combines them with the full data from visitors who did accept cookies. Machine learning is then usef to estimate what results the rejected visits likely produced. Those estimates get added back into your account as “modelled conversions”
The result: advertisers who switch to Advanced Consent Mode V2 typically see 10-30% more reported conversions. Not fake numbers, but a more complete picture of what’s already happening.
There’s also a recent update you may have missed!
Google updated how Consent Mode works back in June 2026. Ad tracking now reads its own consent signals directly, and no longer borrows them from Google Analytics (GA4). If your setup relied on that connection, you may start seeing results dip.
For any business targeting a UK or European audience, the stakes are real: this affects personalisation, remarketing, and conversion measurement. If your consent configuration is out of date, those campaigns are running blind.
So… What does the correct setup look like?
Getting this right requires configuring four specific consent parameters through your tag management system. When done properly you get:
- Modelled conversions filling in the data gap from non-consenting visitors
- Smart bidding working from a much more complete picture
- Remarketing audiences that don’t shrink to a fraction of actual traffic
- Full compliance with UK and EEA private regulations
- No reliance on the GA4 link which broke in June 2026.
Why Most Advertisers Haven’t Fixed This
The honest answer is that it’s not obvious!
Your Google Ads account won’t pop-up telling you it’s missing data, it just shows you the numbers it has, and those numbers look like campaign performance. Campaigns don’t fail. They underperform quietly, and you’d never know unless someone told you what to look for.
This is also a technical fix, not a campaign fix. Most people managing Google Ads are focusing on bids, budgets and creatives. Getting the tracking infrastructure falls in a different discipline, one which sits between your website, Google Tag Manager, and your consent management platform.
This is the exact problem we fix. If you’re not sure whether your setup is correct, a free audit will tell you in short order. And if it turns out that something is broken, the fix is usually straightforward, one you know what you’re looking for.
