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There can be various reasons why AJAX calls may not be functioning in CodeIgniter:

1. CSRF Protection: When CodeIgniter's CSRF Protection is enabled, it can block AJAX calls. To solve this, you can add a token or disable the CSRF Protection for that specific request.

2. Incorrect URL: If the URL in the AJAX call is incorrect or not set correctly, the call may not function correctly.

3. MIME Type Mismatch: If the MIME type of the AJAX response is incorrect, the call may not be executed correctly. You can set the MIME type to application/json if you're returning a JSON response.

4. CORS: Cross-Origin Resource Sharing (CORS) can prevent AJAX calls if they're not allowed. To fix this issue, you can add the necessary headers to allow sharing.

5. Improper Data Format: If the data being sent to the server is not in the proper format, the AJAX call might not function correctly. Make sure to send the data in a valid format.

6. PHP configuration: If your PHP configuration does not allow AJAX calls, you may need to configure your server to allow these calls.

7. Debugging: Debugging the AJAX call using browser developer tools can provide insights into the cause of the error.