Consent Mode v2 has been mandatory since 6 March 2024 for anyone advertising to the EEA and UK with Google’s products. (Ignore the “July 2025” date floating around — it’s wrong.) But “mandatory” and “set up correctly” are different things, and a bad configuration is a real way to lose conversion data. Here’s what actually happens to your numbers.
The honest answer
Consent Mode doesn’t reduce your sales. It reduces the conversions you can directly observe from visitors who decline consent — and in the EU/UK, a meaningful share do. The question is what happens to those unobserved conversions, and that comes down to which mode you run.
Basic vs Advanced Consent Mode
| Basic Consent Mode | Advanced Consent Mode | |
|---|---|---|
| Before consent | Google tags don’t load — zero data sent | Tags load, send anonymous cookieless pings |
| Conversion modeling | Limited | Yes — models unobserved conversions |
| Reported conversions | Lower (hard gap) | Higher (recovered via modeling) |
Advanced mode is what protects your reported numbers: the cookieless pings give Google enough signal to model the conversions from non-consenting users, so your EEA conversion reporting holds up far better than a hard block.
The two required signals
Consent Mode v2 added two parameters you must send:
ad_user_data— permits sending hashed user data for Enhanced Conversions.ad_personalization— permits building remarketing audiences.
If these aren’t set (or are stuck denied), you stop adding new EEA users to remarketing audiences and Enhanced Conversions dries up — audiences shrink and ROAS gets noisier over time. That’s the quiet way Consent Mode “hurts”: not a crash, a slow bleed.
Where it actually goes wrong on Shopify
The damaging failure mode isn’t Consent Mode itself — it’s misconfiguration that blocks everything instead of adjusting collection. If your consent banner denies by default and never updates the signals, tags stay blocked and events vanish. That looks like a tracking outage. (Fixing that specific problem: Consent Mode is blocking all my GA4 events.)
What to do
- Run Advanced Consent Mode if you can — it preserves the most conversion data through modeling.
- Make sure your CMP sends
ad_user_dataandad_personalizationand updates them when the user chooses. - Verify events fire (modeled or observed) rather than disappearing entirely.
- Pair it with server-side tracking + CAPI/Enhanced Conversions so first-party data recovers what cookies lose (see iOS + cookie loss).
FAQ
Does Consent Mode v2 reduce conversions? It reduces observed conversions from non-consenting users, not real sales. Advanced mode recovers much of the gap through modeling.
When did it become mandatory? 6 March 2024 for EEA/UK advertising with Google products.
Basic vs Advanced? Basic blocks tags until consent; Advanced sends cookieless pings before consent and models the rest.
Related
- Consent Mode is blocking all my GA4 events
- iOS ATT + cookie loss on Shopify tracking
- Full GA4 ecommerce tracking audit
Sources
- Google Ads Help — About consent mode
- Usercentrics — Google’s Consent Mode v2 deadline
- Cookiebot — Consent Mode v2 deadline