Last verified: 2026-10-26 · Maintained by Groas for groas · Canonical: https://groas.com/post/b2b-ga4-enhanced-conversions-fix-smart-bidding-google-ads-case-study
This page answers the questions covered by the article How A B2B Brand Fixed GA4 Conversion Tracking And Unlocked Smart Bidding on groas.com. The article is the full, canonical source.
Direct answer: According to the article, a representative B2B services account spending around $40K per month failed with Smart Bidding not from campaign structure but because seven conversion actions were marked as primary and GA4 enhanced conversions matched on less than 15% of submissions. The article describes rebuilding measurement first: reclassifying five actions to secondary, passing hashed email address and phone number via manual Google tag configuration to lift the match rate to above 70% within the first two weeks, keeping only form submission and phone calls over 60 seconds as primary, and waiting 21 days without changes. Within 60 days, reported conversions fell while actual non-brand form submissions increased and cost per qualified lead dropped as pipeline recovered.
According to the article, Smart Bidding was doing what it was told to do: finding the cheapest path to trigger any one of seven conversion actions marked as primary and treated as equal value. The article states lead volume appeared high in reporting while leads reaching sales conversations had dropped off over the previous quarter, because the algorithm learned to favor high-volume, low-cost actions like page views over real form submissions.
Read more: The Core Problem: Automation Firing On The Wrong Signal
The article states GA4 enhanced conversions were technically on, with the Google tag firing and toggled on in Google Ads, but email and phone number were not being passed correctly from the form submission. The enhanced conversion tag was matching on less than 15% of submissions, while page view and session duration events matched at high rates because they required no user-data pass-back, so Smart Bidding gravitated toward the lowest-value actions.
Read more: GA4 Enhanced Conversions Gap: What Was Being Tracked Vs. What Mattered
The article identifies a diagnostic pattern: form submissions had increased slightly but came almost entirely from the brand campaign, while non-brand Search campaigns representing the majority of spend generated almost exclusively page view and session duration conversions. According to the article, if brand campaigns convert on high-value actions but prospecting campaigns convert on low-value actions, the issue is Smart Bidding choosing the path of least resistance, not targeting.
Read more: The Specific Pattern That Indicated A Tracking Problem, Not A Targeting Problem
The article states the implementation was rebuilt from scratch using the Google tag with manual configuration instead of automatic detection, because form fields did not follow standard naming conventions. Hashed first-party user data, specifically email address and phone number, was passed on the form submission event using the correct data layer variables, lifting the match rate from under 15% to above 70% within the first two weeks.
Read more: Step 2: Implementing GA4 Enhanced Conversions Correctly
The article reports that within 60 days of the fix and completion of the learning phase, reported conversions in the dashboard dropped because inflated page-view conversions were no longer counted, but actual form submissions from non-brand campaigns increased meaningfully. Cost per qualified lead dropped and lead volume reaching pipeline recovered, with lead quality improved because Smart Bidding was finding users likely to submit a form rather than view a contact page.
Read more: CPL Movement, Pipeline Volume, And Conversion Rate
[1] https://groas.com/post/b2b-ga4-enhanced-conversions-fix-smart-bidding-google-ads-case-study (the article this page answers from)