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Google Ads Conversions Suddenly Dropped? Check the Causes

Google Ads conversions dropped? First separate a measurement problem from a real decline, then check tracking, consent, bids, budget, auction and account.

Mijo Jurisic

Google Ads Consultant

18 min read
5.0 ★ · 16 Google reviewsGoogle Partner
Ink sketch: a line chart with a sudden drop, a stethoscope and a magnifying glass searching for the cause

In short

When Google Ads suddenly reports fewer conversions, first work out whether measurement has failed or performance has really dropped: steady clicks with missing conversions point to tracking, consent or uploads, falling impressions point to delivery, budget, policies or the account. Only then is it worth looking at bid strategy, auction and seasonality. The 2026 changes belong on the checklist too, for example, according to Google, the Data Manager API for offline uploads from June 15 and the AI Max upgrade from September 1.

Monday morning, a look at the account, and last week's conversions are only half as high as usual. The first reflex is almost always the same: raise bids, raise budget, change something. That is exactly what I would hold off on first. In my experience, a drop has one of two causes: either the account is no longer measuring correctly, or the performance really is gone. The fixes are completely different, and treating a measurement problem with bid changes makes it worse.

In this article I go through the check in the order I use in accounts myself: first separating a measurement problem from a real decline, then tracking, consent, the 2026 changes, bid strategy, budget, auction, seasonality, landing page, policies and finally payment and account. Every point comes with concrete test steps. Statements about Google features are based on the Google Ads Help Center, the Google Analytics Help Center and the Google Ads Developer Blog, and the sources are listed at the end. Where I add my own assessment from practice, I say so.

Step 1: Measurement problem or real decline?

Before you change anything, put four numbers side by side: impressions, clicks, conversions and the leads or sales that actually arrived in the business. That last number does not come from Google Ads but from your inbox, your CRM or your shop backend. It is the cross-check that decides everything else.

SymptomFirst checkLikely direction
Clicks, no conversionsCount leads in your inbox or CRMMeasurement
Impressions goneCampaign status, budget, ad status, billingDelivery
Last few days weakSegment “Days to conversion”Conversion lag
Everything falls evenlySame period last year, auction insightsDemand or competition

Table scrolls sideways

The table is my working heuristic, not a Google rule. But it saves a lot of time because it halves the search immediately.

Three tools in the account help with this first assessment:

  1. Factor in conversion lag. According to Google, conversions are attributed to the day of the ad interaction and can be recorded later. The Google Ads Help Center states explicitly that conversion lag impacts recent data more than old data. Via Segment, Conversions and “Days to conversion” you can see how long it typically takes in your account. If only the last few days are weak, that is often not a drop yet.
  2. Open Explanations. For Search, Performance Max, Demand Gen, Display, Video and App campaigns, Google shows explanations for significant performance fluctuations. As possible causes, the Help Center lists bids, budget, conversions (such as tracking settings and delays), auction dynamics, search volume, account changes and targeting, among others. It does not replace a check, but it often points in the right direction.
  3. Read the change history. According to Google, the change history lists changes from the last two years. I filter for the days before the drop: who changed what, budget, target, keywords, conversion actions? Changes made by automated Google systems can also show up there.

If the cross-check shows that the business receives as many leads as before, you are very likely looking at a measurement problem. Then steps 2 to 4 are your path. If the business is receiving less as well, continue from step 5.

Step 2: Check tracking and tags

In my experience, a broken tag is one of the most common causes of a seemingly sudden drop, especially after a website relaunch, a new form tool or a change in Google Tag Manager.

  1. Look at the status of your conversion actions. Under Goals and Conversions, every action has a tracking status. According to Google, “Unverified” means the tag has not fired yet. “Tag inactive” or “No recent conversions” means that no conversions attributed to ad clicks have been recorded in the last 7 to 14 days. For “Inactive” or “Needs attention” caused by tag issues, Google recommends checking with Google Tag Assistant.
  2. Trigger a conversion yourself. Submit the form yourself, ideally on a smartphone, and watch in Tag Assistant whether the conversion tag fires on the thank-you page or on the submit event. Google points out: if the tag demonstrably fires correctly, the status “No recent conversions” is probably due to a lack of recent conversions rather than a technical tag issue. Then you are back at the cross-check from step 1.
  3. Check primary and secondary. According to Google, only primary conversion actions go into the “Conversions” column and into bidding, provided they belong to the goal used for bidding. Secondary actions only appear in “All conversions”. If someone switched an action from primary to secondary, conversions disappear from the main column even though measurement continues. You can see that in the change history.
  4. Apply data exclusions once the outage is confirmed. For tagging problems, website outages or import problems, Google offers data exclusions. They make Smart Bidding ignore the faulty days. According to Google, they are available for Search, Display, Shopping and Performance Max campaigns with conversion-based or value-based Smart Bidding, should be applied as soon as possible after the problem is detected, and are not meant for regular or long-term use.

How often a missing or incorrectly wired consent mode is behind unexplained drops in conversions is something I have covered in the article on Consent Mode v2, so I will not repeat it here. For the diagnosis, three test steps count:

  1. Consent status in Google Ads. Via Goals, Conversions, Summary, the conversion action and the “Diagnostics” tab, Google shows whether consent mode is implemented and whether modeling is active.
  2. Consent signals in Tag Assistant. According to Google, the Consent tab shows the default status on page load and the update after consent, for ad_storage, ad_personalization, ad_user_data and analytics_storage. Before consent, the default should be “Denied”, and after you accept, the update should be “Granted”. If the update never arrives, consent is not reaching the Google tags.
  3. Put banner changes next to the date. From my practice: an update of the consent platform, a new banner design or a changed tag order coincides suspiciously often with the first weak day. Ask who changed what on the banner and when.

Step 4: Go through the 2026 changes

In 2026 Google has changed several things that can have an effect in accounts without any visible change of your own. These four are the ones I currently check for every unexplained drop.

According to the Google Analytics Help Center, the collection of Google Ads cookies and identifiers through the Google Analytics tag used to be controlled by both the “Google signals” setting and consent mode. From June 15, 2026 Google Analytics uses consent mode as the single data control. The Google signals setting then only controls the association of GA data with data from signed-in users for behavioral reporting.

Important for the diagnosis: this affects the data in Google Analytics, not directly the conversions column in Google Ads. If your conversions are measured with the Google Ads conversion tag, this change does not explain a drop in Google Ads. It is different if you import GA conversions into Google Ads: according to Google, conversions created in Google Analytics are secondary by default but can be changed to primary in Google Ads. Only then would I include the GA side in the search.

Enhanced conversions: one switch from June 2026

According to the Google Ads Help Center, since April 2026 Google Ads accepts user-provided data from website tags, Data Manager and API connections at the same time. From June 2026, enhanced conversions for web and for leads are combined into one feature with a single on/off switch. If you had already accepted Google's customer data terms, you are automatically moved to the new unified status, according to Google. Test step: check in the conversion settings whether the switch is actually on.

Offline and lead uploads: Data Manager API from June 15, 2026

According to the Google Ads Help Center, from June 15, 2026 offline conversion imports and enhanced conversions for leads uploads are migrated to the Data Manager API and blocked in the Google Ads API. Developer tokens that did not send a request between January and June 2026 will not be allowlisted for legacy access. If your CRM, a connector or your own script uploads leads via the Google Ads API, check whether uploads have still been arriving since mid-June and whether the provider has switched to the Data Manager API. Missing uploads look like missing leads in the account.

AI Max: automatic upgrade from September 1, 2026

According to the Google Ads Developer Blog of August 12, 2026, from September 1, 2026 Google Ads progressively upgrades Search campaigns that use campaign-level broad match or standalone automatically created assets to AI Max over the course of September. After the upgrade, search term matching is on by default, while final URL expansion stays off. Dynamic Search Ads are excluded, and Google plans their migration for February 2027.

Test steps: look for the upgrade date in the change history and filter the “Match type” column in the search terms report for “AI Max”. That shows you which searches only came in through AI Max and how they convert. Google recommends waiting at least two weeks after enabling AI Max before making changes such as adding negative keywords. I would still exclude clearly irrelevant search terms right away, which is my view from practice. What the change means in detail is explained in my post on the AI Max upgrade.

Step 5: Bid strategy, learning phase and target changes

If measurement is fine and fewer leads still come in, the next thing I look at is the bid strategy. Google shows a dedicated status for it:

  • Learning: the strategy is gathering data after a new strategy, a setting change or a composition change.
  • Limited: performance is being limited, for example by budget, bid limits or available inventory.
  • Misconfigured: according to Google, a conversion-based strategy is missing the right conversions. This is often the result of a problem from step 2.

According to Google, Smart Bidding requires a standard learning phase of 7 to 14 days. Frequent manual changes to budgets, targets (CPA or ROAS) or conversion goals reset the learning window. A drop that starts right after a target change therefore often has a simple explanation. From my practice: a significantly tighter target CPA almost always costs volume, because the strategy then only bids on cheaper auctions.

On top of that there is a change many people missed: since August 17, 2026 Google aligns budget-limited campaigns with Target CPA, Target ROAS or (for Demand Gen) Target CPC more consistently with the set target. If you used to be well below your target CPA, you may now see different numbers. The details are in my post on the August 2026 bidding strategy change.

Test step: filter the change history for changes to bid strategy, target values and conversion goals and put the date next to the start of the drop.

Step 6: Budget and “limited by budget”

Fewer conversions with fewer impressions often has a mundane cause: the budget is no longer enough, or it was cut. Two columns that I add in every diagnosis show whether that is the case:

  • “Search lost IS (budget)”: according to Google, the share of time your ads were not shown on the Search Network due to insufficient budget.
  • “Search lost IS (rank)”: the share lost because of a low ad rank.

If the budget value rises, money is missing. If the rank value rises, you are losing auctions, and step 7 comes next. In addition, the bid strategy status shows “Limited” when the daily budget is limiting performance. Also check whether several campaigns share one budget and one of them is pulling the money. That is a common cause in accounts with several services or locations.

Step 7: Auction insights and competition

If lost impression share due to rank is rising or click prices are climbing, a look at auction insights is worth it. According to Google, the report shows impression share, overlap rate, position above rate and the rates for top and absolute top of page, among others, each compared with other advertisers in the same auctions. The report only appears once a minimum level of activity is reached.

Test step: compare the period before the drop with the period after it. If a new competitor shows up with a high overlap rate and a high position above rate, the auction has changed, not your account. Then neither a tracking check nor hectic bid increases will help, but an honest calculation of what a click is worth to you will.

Step 8: Seasonality

Some drops are not drops at all. School holidays, long weekends, weather or the end of a season change demand without anything being broken in the account. The quickest test: look at the same period last year, if the account is old enough, and compare how impressions developed. If impressions and leads fall evenly, that points to lower demand.

A special case is seasonality adjustments. Google describes them as a tool for expected, significant changes in conversion rate, best suited to periods of 1 to 7 days, and according to Google they may not work well for more than 14 days. Test step: check whether someone set a seasonality adjustment and whether its period matches the drop.

Step 9: Landing page and website

A form that no longer submits, a thank-you page that no longer loads, a plugin update that moves the button: from the point of view of Google Ads this looks like a performance drop, because clicks come in and nothing happens.

  1. Click through the landing page yourself, on smartphone and desktop, all the way to the thank-you page.
  2. Check form delivery: does the test enquiry arrive in the inbox, and does it not end up in spam?
  3. Check availability: according to Google's “Destination not working” policy, an ad is disapproved if the destination does not work, for example if it returns HTTP errors such as 403, 404 or 500 to the crawler. A landing page that goes down from time to time can therefore also cost delivery.

Step 10: Disapproved ads and policies

If impressions drop to zero in individual ad groups, I look at the ad status and the policy manager. Disapproved or limited ads and assets are easy to miss precisely when they only affect part of the account. According to Google, most ads are reviewed within 24 to 48 hours. New or edited ads may therefore not serve for a while.

For individual search terms, the Ad Preview and Diagnosis tool helps. According to Google, it lets you find out why no ads are showing for a particular search term.

Step 11: Payment and account problems

According to Google's troubleshooting help, ads do not serve if the account is suspended, is going through a security check or has billing problems, such as a payment suspension or a payment method that has not been set up, until the problem is fixed. According to Google, a security check can also mean that no impressions are served or that a temporary daily spend limit applies.

Test steps: read the notifications in the account, open billing and check the payment method and the last payment. From my practice, an expired credit card is a surprisingly common reason for a “sudden” standstill. If the account is suspended, this is no longer about optimization. I have summarized what to do in that case in the post Google Ads account suspended, and for getting the account back there is Google Ads Recovery (from €700).

My check order as a short list

  1. Cross-check: leads in the business against conversions in the account.
  2. Leave out the last few days, look at “Days to conversion”.
  3. Read Explanations and the change history.
  4. Status of conversion actions, Tag Assistant, primary and secondary.
  5. Consent status in Google Ads and in Tag Assistant.
  6. The 2026 changes: GA consent, enhanced conversions switch, Data Manager API, AI Max.
  7. Bid strategy status and target changes.
  8. Lost impression share due to budget and rank.
  9. Auction insights over time.
  10. Last year and seasonality adjustments.
  11. Landing page, form, availability.
  12. Ad status and policy manager.
  13. Billing and account status.

Only when the cause is clear do I change something, and then only one thing at a time. Otherwise you will not know afterwards what made the difference.

When a second look is worth it

Many drops can be narrowed down with this list quickly. It gets difficult when several causes come together, for example a consent update in the same week as the AI Max upgrade. How good account management responds in a case like that is something I describe in the scenario on the sudden performance drop in the article on how to recognize good Google Ads management.

If you do not want to do the check yourself, or still have no clear cause after the list: in the Google Ads audit (from €500) I go through exactly these points in your account, and in ongoing Google Ads management (from €1,000 per month) this check is part of the routine, so an outage does not go unnoticed for weeks.

Sources

As of: September 2026

Frequently asked questions

There are two broad groups of causes. Either the account is no longer measuring correctly, for example because of a broken tag, a changed consent banner or failed uploads. Or performance has really dropped, for example because of budget, bid strategy, competition, seasonality, the landing page, disapproved ads or an account problem. I separate the two first by putting clicks and impressions next to conversions and counting the leads that actually arrived in the inbox or CRM.

Tags:Performance DropConversion TrackingSmart BiddingAccount Analysis
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Mijo Jurisic

Google Ads consultant & founder of MJ Marketing. 5+ years of hands-on practice: from a self-taught start to advising direct Google Ads customers on behalf of Google. 500+ Google Ads accounts and €22M in media spend managed across the career.

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