04/08/2026
Rolling out Consent Mode V2 doesn't need to be overwhelming if you break it into phases. Phase one: pick a certified CMP like CookieYes, OneTrust, or Cookiebot for speed, or build manually for full control and no monthly fee. Phase two: in GTM, set a Consent Initialisation tag firing before everything else, with all four parameters denied by default. Phase three: wire up the update logic so visitor choices push through to your tags. Phase four: test every flow in GTM preview mode, in incognito, before publishing. Phase five: go live, then monitor GA4's consent status and Google Ads diagnostics for two to three weeks while Google's modelling activates.