A New Era in Cookie Policies: A Guide to Migrating to Consent Mode v2
Google Consent Mode V2 opens a new chapter in cookie policies. User consent is now managed through tags, signals and data flows as well as the “accept” button. For websites, this transition…
ePrivacy & Data Management • 2025
Google Consent Mode V2 opens a new chapter in cookie policies. User consent is now managed through tags, signals and data flows as well as the “accept” button. For websites, this transition represents both a technical and a legal transformation.
Summary: Consent Mode V2 automates cookie management while ensuring full compliance with KVKK and ePrivacy rules. Incorrect implementation, however, can cause data loss or gaps in measurement.1. What is Consent Mode V2?
Google’s new Consent Mode V2 system sends the user’s consent status (consent signals) to all Google tags. When consent is not given, data are processed in anonymised or restricted form.
| Feature | V1 | V2 |
|---|---|---|
| Consent signal | Tag-based | User-based (consent signal) |
| Google Ads compliance | Partial | Compulsory (as of March 2025) |
| Data Collection | Anonymous measurement | Dynamic, based on consent status |
| Implementation | Via a GTM tag | Via a CMP (Consent Management Platform) |
“Consent Mode V2 makes data managers responsible, rather than just cookie managers.”
2. Why is it so important?
- Legal obligation: From 2025, Google will stop data processing on sites that do not comply with V2.
- KVKK and ePrivacy compliance: Ensures that cookie data are not processed without consent.
- Data accuracy: Measurement models are optimised according to consent status.
- Advertising performance: Modelling reduces data loss.
“Consent management is now central to measurement strategy.”
3. Steps to take during migration
| Step | Action | Purpose |
|---|---|---|
| 1 | Analyze your current cookie management tool | Check support for consent signals |
| 2 | Make your GTM tags V2-compliant | Ensure compliant data collection |
| 3 | Update user consent screens | Transparency and KVKK compliance |
| 4 | Add a consent logging system | Auditability |
| 5 | Test the Google Ads & Analytics setup | Performance verification |
4. The legal implications of Consent Mode V2 in Türkiye
With the 2025 changes to KVKK, cookie data have been explicitly defined as “personal data”. Collecting data through cookies or tags without user consent is therefore considered a direct violation. Migration to V2 is a legal compliance step as well as a technical one.
“Consent Mode is now the digital extension of KVKK.”
5. Frequent Mistakes
- Continuing to use the V1 tag,
- Not specifying types of cookies in consent texts,
- Failing to anonymise data when consent is refused,
- Failing to forward signals to third-party tags,
- Failing to retain consent logs.
Migrate to Consent Mode V2 without taking risks.
B10 Digital Agency prepares your brand for the new era with Google CMP integration, KVKK compliance control and performance measurement optimization services.
Google announced that it would stop measurement and advertising data flows on sites without V2 integration from 6 March 2025.
Is a CMP required to migrate to V2?Yes. V2 compliance cannot be achieved without Google CMP (Consent Management Platform) approval. The CMP manages and transmits consent signals.
What does this transition in Turkey mean for the KVKK?Because KVKK defines cookies as personal data, V2 makes cookie consent digitally demonstrable. This achieves both ePrivacy and KVKK compliance in one step.
Tags: consent mode v2 • cookie policy • kvkk • eprivacy • data management • B10 Digital Agency • digital compliance
Sources and related documents
These documents provide references for the methods and rules discussed in this article.