dataLayer

Without a dataLayer, tracking tools scrape values from the DOM, fragile and inconsistent.

What we check

Checks whether window.dataLayer is initialised and populated via push().

Why it matters

Without a dataLayer, tracking tools scrape values from the DOM, fragile and inconsistent.

Common causes

GTM was installed without a dataLayer concept, all triggers hang on click selectors instead of events.
The dataLayer gets initialised after the GTM snippet and overwrites the events already collected.
The shop system ships its own dataLayer under a different name, GTM listens to the standard one.
Events are only pushed on some templates, checkout or forms stay silent.

The fix

Initialise window.dataLayer before the GTM container and push() on every business event.

Matching template

GA4 and Google Ads Consent Mapping

Documents which data flows from GA4 to Google Ads and which signal governs each flow.

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Check it yourself first

The Tracking Check tests this point along with all the others, in seconds.

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Related checks

Analytics tag →Tag manager →

Asked often

What does a failing "dataLayer" check mean?

Without a dataLayer, tracking tools scrape values from the DOM, fragile and inconsistent. Initialise window.dataLayer before the GTM container and push() on every business event.

How do you fix a failing "dataLayer" check?

Initialise window.dataLayer before the GTM container and push() on every business event.

The fix, delivered

Wired up in days, not sprints.

Findings from the Tracking Check go into a ranked sequence with effort estimates in the Audit Sprint, every module with an acceptance criterion.

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