How to Implement Consent Mode V2 for Google Ads in Google Tag Manager (2026 Update)

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Google rolled out a significant change to Consent Mode on 15 June 2026. Google Ads now relies directly on its own consent signals rather than borrowing from GA4. If your current setup routes ad tracking through a linked Analytics tag, it no longer functions as a workaround. You need a standalone configuration.

Here is what needs to be in place for a correct implementation.

The Four Consent Parameters

Consent Mode V2 uses four parameters. Each controls a separate part of data collection:

ad_storage controls advertising cookies on the visitor's device
ad_user_data governs whether user data is sent to Google for measurement
ad_personalisation determines whether data can be used for remarketing
analytics_storage manages analytics cookies (now fully separate from Ads tracking as of June 2026)

All four must be correctly configured. Missing one breaks part of your tracking silently.

GTM Configuration Steps

In Google Tag Manager, set default consent states before any tags fire, then update them based on the visitor's banner interaction:

Add a Consent Initialization trigger to your workspace
Set default states to denied for all four parameters
Use your consent management platform's GTM integration to fire a consent update tag when the visitor accepts or rejects
Ensure your Google Ads conversion tag and remarketing tag have consent checks enabled

Basic vs Advanced: The Business Impact

Basic mode blocks all tags until consent is granted. Every visitor who rejects cookies produces zero data for your Google Ads account.

Advanced mode keeps tags active but sends cookieless, anonymous pings when consent is denied. Google uses these pings alongside consented user data to model missing conversions. Most advertisers see 10 to 30% more reported conversions after switching to Advanced. For Smart Bidding to function well, it needs accurate conversion volume. Advanced mode is the only sensible choice for any account running Target CPA or Target ROAS.

Validation

Use Google Tag Assistant to inspect consent states in real time. Check your network tab for google-analytics.com/g/collect requests and confirm consent parameters are included.

The complete setup guide covering every parameter, the June 2026 changes, and testing steps is in this Consent Mode V2 for Google Ads breakdown. If you want a certified CMP that handles the GTM integration automatically, Seers is Google-certified and supports all four parameters with a no-code GTM setup.