Why Crawl Errors Can Silently Kill Your Rankings
If Google cannot crawl your pages, those pages do not exist in search results. It is that simple. Crawl errors are one of the most common yet overlooked reasons websites lose organic traffic overnight.
Google Search Console (GSC) is your primary tool for spotting these problems. But finding the errors is only half the battle. You need to know exactly what each error means and how to fix it fast.
In this guide, we walk you through every type of crawl error you may encounter, explain why it happens, and give you the precise steps to resolve it. Whether you are dealing with 404 pages, server errors, or broken redirects, you will find the answer below.
What Are Crawl Errors in Google Search Console?
Crawl errors occur when Googlebot tries to reach a page on your website but fails. When this happens, Google cannot index that page, which means it will never appear in search results.
Google Search Console reports these errors in two main places:
- The Pages report (formerly called the Coverage report) under the Indexing section
- The URL Inspection tool, which lets you check individual URLs
Crawl errors generally fall into two categories:
Site-Level Errors
These affect your entire website. Examples include DNS resolution failures, server connectivity issues, and robots.txt fetch problems. When these occur, Googlebot may not be able to reach any page on your site.
URL-Level Errors
These affect individual pages. Common examples include 404 (Not Found) errors, 500 (Server Error) responses, and redirect problems. These are the errors you will deal with most frequently.
Step 1: Find Your Crawl Errors in Google Search Console
Before you fix anything, you need to know exactly what is broken. Here is how to locate your crawl errors:
- Log in to Google Search Console
- Select your property (website)
- In the left sidebar, click Indexing and then Pages
- Scroll down to the section titled “Why pages aren’t indexed”
- Click on any error type to see the list of affected URLs
You can also use the URL Inspection tool at the top of GSC. Paste any URL from your site and Google will tell you its crawl status, last crawl date, and any issues it encountered.
Pro tip: Export the full list of error URLs by clicking the export button. This gives you a spreadsheet you can work through systematically.
Step 2: Understand the Type of Crawl Error
Not all crawl errors are equal. Some are critical and need immediate attention. Others may be harmless. The table below breaks down the most common errors, their severity, and what causes them.
| Error Type | What It Means | Severity | Common Cause |
|---|---|---|---|
| 404 (Not Found) | The page does not exist | Medium to High | Deleted page, changed URL, typo in link |
| Soft 404 | Page loads but has no useful content | Medium | Empty page, thin content, custom 404 page returning 200 status |
| 500 (Server Error) | Your server failed to respond | High | Server overload, PHP errors, database issues |
| Redirect Error | Redirect is broken or loops | High | Redirect chains, redirect loops, incorrect .htaccess rules |
| Blocked by robots.txt | Your robots.txt file blocks Googlebot | High | Overly restrictive Disallow rules |
| Submitted URL has crawl issue | A URL in your sitemap cannot be crawled | High | Sitemap includes broken or blocked URLs |
Step 3: Fix 404 (Not Found) Errors
404 errors are by far the most common crawl issue. They occur when Googlebot requests a URL that does not return a valid page. Here is how to handle them:
Determine If the Page Should Exist
Ask yourself: was this page deleted on purpose, or was it removed by mistake?
- If the page was deleted intentionally and no replacement exists, a 404 response is perfectly fine. Google will eventually drop it from the index.
- If the page was deleted but a similar page exists, set up a 301 redirect to the most relevant replacement page.
- If the page was removed by accident, restore it immediately.
How to Set Up a 301 Redirect
If you are using WordPress, the easiest method is a redirect plugin like Redirection or Rank Math (which has a built-in redirect manager).
If you prefer to edit your server configuration directly:
For Apache (.htaccess)
Redirect 301 /old-page-url/ https://yoursite.com/new-page-url/
For Nginx
rewrite ^/old-page-url/$ https://yoursite.com/new-page-url/ permanent;
Check for Broken Internal Links
Many 404 errors come from your own site linking to pages that no longer exist. Use a tool like Screaming Frog, Ahrefs, or even a free broken link checker to scan your site. Then update or remove those internal links.
Improving internal linking is not just good for fixing errors. It also helps Google discover and index your important pages more efficiently.
Step 4: Fix Soft 404 Errors
A soft 404 happens when a page returns a 200 (OK) HTTP status code but the content looks like an error page to Google. This confuses search engines.
Common causes:
- A custom 404 page that does not return a proper 404 HTTP status code
- Pages with little or no content (empty category pages, blank product pages)
- Search result pages with zero results
How to Fix Soft 404s
- If the page is truly gone, make sure your server returns a proper 404 or 410 (Gone) status code, not a 200.
- If the page exists but is thin, add meaningful content to it. Give users a reason to stay.
- If the page is a duplicate or unnecessary, redirect it (301) to the most relevant page or remove it from your sitemap.
Step 5: Fix Server Errors (5xx)
Server errors are the most urgent crawl errors because they signal that your server is failing to respond. If Googlebot encounters repeated 5xx errors, it may reduce how often it crawls your site.
Common Causes and Solutions
| Cause | How to Diagnose | Fix |
|---|---|---|
| Server overload | Check server resource usage (CPU, RAM) during crawl times | Upgrade hosting plan, enable caching, use a CDN |
| PHP or application error | Check your server error logs (error_log file) | Debug and fix the code error, update plugins/themes |
| Database connection failure | Look for “Error establishing a database connection” messages | Repair the database, check credentials in wp-config.php, contact your host |
| Timeout issues | Test page load speed; check for slow queries | Optimize database queries, increase PHP execution time, reduce page complexity |
| Hosting downtime | Use an uptime monitoring service | Switch to a more reliable hosting provider |
Important: After resolving server errors, review your server logs regularly. Do not wait for Google Search Console to report problems. GSC data can be delayed by several days.
Step 6: Fix Redirect Errors
Redirect errors happen when Googlebot follows a redirect that leads nowhere useful. There are three main types:
Redirect Loops
Page A redirects to Page B, and Page B redirects back to Page A. This creates an infinite loop that Googlebot (and users) cannot escape.
Fix: Trace the redirect chain manually or with a tool like httpstatus.io. Identify where the loop occurs and correct the redirect so it points to a final destination.
Long Redirect Chains
Page A redirects to B, B redirects to C, C redirects to D. Google may stop following after a few hops.
Fix: Simplify the chain. Make Page A redirect directly to the final destination (Page D). Every redirect in a chain wastes crawl budget and dilutes link equity.
Redirects to Broken Pages
A redirect points to a page that returns a 404 or 500 error.
Fix: Update the redirect to point to a live, relevant page.
Best Practices for Redirects
- Always use 301 redirects for permanent URL changes (not 302 temporary redirects)
- Keep redirect chains to a maximum of one hop
- Audit your redirects every quarter to catch new issues
- Never redirect all 404 pages to your homepage. This is treated as a soft 404 by Google.
Step 7: Fix “Blocked by robots.txt” Errors
If Google Search Console shows pages blocked by robots.txt, it means your robots.txt file is telling Googlebot not to crawl those URLs.
How to Check Your robots.txt
- Visit
https://yoursite.com/robots.txtin your browser - Look for
Disallowrules that may be too broad - Use the robots.txt Tester in Google Search Console (under Settings > robots.txt) to test specific URLs
Common Mistakes
Disallow: /blocks your entire site from being crawledDisallow: /category/blocks all category pages- Leftover rules from a staging environment that were never removed after launch
Fix: Edit your robots.txt to remove or adjust overly restrictive rules. If you are on WordPress, you can edit robots.txt through an SEO plugin like Yoast or Rank Math, or directly via your server files.
Step 8: Fix “Submitted URL Has Crawl Issue”
This error appears when a URL listed in your XML sitemap cannot be properly crawled by Google. It is a strong signal that your sitemap needs attention.
- Check the URL using the URL Inspection tool in GSC to see the specific error
- Remove dead URLs from your sitemap. Your sitemap should only contain live, indexable pages that return a 200 status code.
- Regenerate your sitemap if you use an SEO plugin. Most plugins automatically exclude non-indexable pages.
- Resubmit your sitemap in GSC under Indexing > Sitemaps after cleaning it up.
Step 9: Validate Your Fixes in Google Search Console
After fixing crawl errors, you need to tell Google to re-check the affected URLs. Here is how:
- Go to Indexing > Pages in GSC
- Click on the specific error type you fixed
- Click the “Validate Fix” button
- Google will start recrawling the affected URLs over the next few days
- You will receive an email notification with the validation results
For individual URLs, use the URL Inspection tool and click “Request Indexing” to prompt an immediate recrawl.
Step 10: Prevent Future Crawl Errors
Fixing current errors is essential, but preventing new ones saves you time and protects your rankings long term. Here is your prevention checklist:
- Keep your XML sitemap clean. Only include canonical, indexable URLs. Remove anything that redirects, returns errors, or is blocked.
- Set up proper redirects immediately whenever you delete or move a page.
- Monitor your site weekly in Google Search Console. Do not let errors pile up for months.
- Run regular site audits with tools like Screaming Frog, Ahrefs, or Semrush to catch broken links and redirect issues before Google does.
- Use uptime monitoring (such as UptimeRobot or Pingdom) to catch server downtime immediately.
- Check server logs. Your raw access logs show exactly what Googlebot requested and what response it received. This is more accurate and faster than waiting for GSC data.
- Test after every site update. Plugin updates, theme changes, CMS migrations, and hosting changes can all introduce new crawl errors.
Quick Reference: Crawl Error Diagnosis Flowchart
Use this quick decision tree when you encounter a crawl error:
- Is it a 404? Check if the page should exist. If yes, restore it or redirect it. If no, leave it.
- Is it a 5xx? Check server logs immediately. Fix the server-side issue (hosting, code, database).
- Is it a redirect error? Trace the redirect chain. Eliminate loops and simplify chains.
- Is it blocked by robots.txt? Review your robots.txt rules and remove incorrect Disallow directives.
- Is it a soft 404? Add content to the page or return a proper 404/410 status code.
- After fixing: Validate the fix in GSC and monitor for recurrence.
Frequently Asked Questions
How long does it take for Google to recrawl fixed pages?
After you validate a fix in Google Search Console or request indexing, it typically takes anywhere from a few days to two weeks. High-authority sites with frequent content updates tend to get recrawled faster. You can speed things up by using the URL Inspection tool to request indexing for individual pages.
Are 404 errors always bad for SEO?
No. If a page was intentionally deleted and no relevant replacement exists, a 404 response is the correct behavior. Google has confirmed that 404 errors for legitimately removed pages do not hurt your overall site rankings. The problem arises when important pages return 404 errors or when you have thousands of 404s caused by broken internal links.
What is the difference between a 404 and a 410 status code?
A 404 means “Not Found” and suggests the page might come back. A 410 means “Gone” and tells Google the page has been permanently removed. If you know a page is never coming back, a 410 helps Google drop it from the index faster.
Should I redirect all 404 pages to my homepage?
Absolutely not. Google treats mass redirects to the homepage as soft 404 errors. Only redirect a URL to another page if that page is genuinely relevant to the original content. If there is no relevant page, let the 404 stand.
How often should I check for crawl errors?
We recommend checking Google Search Console at least once a week. If you run a large site with thousands of pages, or if you recently made significant changes (migration, redesign, plugin updates), check daily until things stabilize.
Can crawl errors affect my entire site’s ranking?
Isolated 404 errors on unimportant pages will not tank your rankings. However, widespread server errors (5xx) can cause Google to reduce its crawl rate for your entire site, which slows down indexing of new and updated content. Fix server errors as a top priority.
What tools can I use alongside Google Search Console to find crawl errors?
Several tools complement GSC effectively:
- Screaming Frog SEO Spider for comprehensive site crawls
- Ahrefs Site Audit for automated monitoring
- Semrush Site Audit for detailed error reports
- Server access logs for real-time Googlebot activity data
Wrapping Up
Crawl errors are not just technical noise. They represent missed opportunities for your pages to appear in Google search results. The good news is that most crawl errors are straightforward to fix once you know what you are looking at.
To recap the process:
- Find your errors in Google Search Console under Indexing > Pages
- Identify the error type (404, 5xx, redirect, robots.txt block, soft 404)
- Apply the appropriate fix (redirect, restore, server repair, or sitemap cleanup)
- Validate your fix in GSC
- Set up monitoring to prevent future errors
Take 30 minutes this week to audit your crawl errors. Your rankings will thank you for it.

