What is UTM Parameters?
UTM parameters are tags appended to a URL that tell GA4 which specific campaign, channel, or piece of content drove a visitor to the website.
At a Glance
UTM Parameters
UTM parameters are tags appended to a URL that tell GA4 which specific campaign, channel, or piece of content drove a visitor to the website.
Full Definition
UTM parameters are the five query string variables appended after a ? in a URL: utm_source (e.g., google), utm_medium (e.g., cpc), utm_campaign (e.g., spring-service-promo), utm_term, and utm_content. When a visitor clicks a tagged URL, GA4 reads these parameters and attributes the session accordingly. Dealerships use UTMs on every paid ad, email campaign, and OEM co-op link to ensure traffic from those channels does not get misattributed to organic or direct in GA4 reports.
Why It Matters for Your Dealership
Without UTM parameters on paid campaign URLs, GA4 misattributes paid traffic to organic. This inflates organic CPL calculations and makes SEO look more expensive than it is, which distorts budget decisions and can cause GMs to underinvest in the lower-cost channel.
In Practice
Dealerships use UTMs on every paid ad, email campaign, and OEM co-op link to ensure traffic from those channels does not get misattributed to organic or direct in GA4 reports.
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