How to Fix Sync Session Failed to Start Effortlessly

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sync session failed to start

iPhone users may encounter an error message stating that a sync session has failed to initiate.

The error will persist on the phone and is not easily resolved. It has multiple variations.

At times, you may encounter a straightforward error message indicating that the synchronization session failed to initiate. Conversely, on other occasions, a more elaborate message may appear, such as ‘iTunes was unable to synchronize calendars to the iPhone due to an unsuccessful sync session.’

This error is particularly frustrating due to its lack of specificity.

Having an indication would aid the user in resolving the issue on their iPhone. Several users of iPhone have disclosed experiencing this complication on various forums.

They attempted to troubleshoot on both the computer and iTunes in an effort to resolve the issue. At times, the issue persisted and remained unresolved. The sole remaining option was to select the “OK” button within the dialogue box.

Fortunately, there are ways to resolve the “sync session failed to start” error on your phone without resorting to extreme measures. Here, you will discover various methods that you can employ to rectify the issue both manually and automatically.

Each method has a unique set of instructions that are crucial to preventing the error “sync session failed to start” from appearing on your system. Be sure to carefully read and follow the instructions for each method.

If a technique is ineffective, you can proceed to the following one to obtain the appropriate solution.

Way 1: Fix Sync Session Failed to Start by Update

If your phone displays a “sync session failed to start” error, it may be due to outdated software such as iTunes. Ensure that you update your software to determine if this resolves the issue.

Here is a detailed guide to fixing the problem.

  • Connect your desktop computer to a network, and after that, launch iTunes.
  • After launching iTunes, then get to ‘Help,’ then from here, go to ‘Check for update.’
  • Here follow the instructions to update your drivers.
Update iTunes

If the first method does not resolve the issue, proceed to the next approach.

PS: Click here to figure out how to fix iTunes has an invalid signature during the installation.

Way 2: Fix Sync Session Failed to Start by Delete

Don’t worry about deleting your backup data as it’s unnecessary. An unsuccessful sync may be due to an outdated iTunes library. Simply removing your previous iTunes backups will effectively resolve the issue on your iPhone.

Follow up below to solve the problem.

  • Goto iTunes > here, and make your way to the preferences option.
  • Choose Edit > Preferences option (For windows).
  • After that, click on the devices.
  • Here will see the list of backups. Select the one you wish to delete. To learn more about the backup, you can hover over the cursor on the backup.
  • After you find the right backup to delete, click on ‘Delete Backup’ and then hit ‘Confirm.’
  • That’s it!
Delete backups on iTunes

If this one did not work, proceed to the next for a solution.

Way 3: Fix Sync Session Failed to Start by TunesCare

Here is another software you can use to fix the sync session that failed to start a problem on your iPhone using Tenorshare TunesCare.

This app offers a plethora of features that can efficiently and seamlessly resolve any issues on your phone. Similarly to its predecessor, it can effectively troubleshoot errors related to iTunes and other phone features.

Use Tenorshare TunesCare to instantly resolve any issues with your phone.

Follow up below guide to figure out how to remove the error on your phone and make your phone faster.

Download TunesCare and launch it on your PC. The app has specific installation and running requirements, but most contemporary computers are equipped to provide a seamless experience.

Connect your iOS device to the computer using a USB cable following installation. Tenorshare TunesCare is furnished with a variety of features that can identify the phone and its model.

You need not manually input all phone information, thus saving ample time.

When launching it, you can see two options on your screen. One is to Fix iTunes Sync Problems and fix all iTunes Issues.

To initiate the repair procedure, select “Fix iTunes Sync Problems” as the synchronization session could not be commenced.

Tenorshare TunesCare

Be patient while the repair process is underway.

After completion, your functions will operate normally as intended or as they previously did.

Fix sync session failed to start via Tenorshare TunesCare

If you have implemented the aforementioned steps, your iPhone and iTunes should now be fully operational, and you should not encounter any further issues with the sync session failing to initiate on your device.

If you encounter any other iTunes errors, you will possess software capable of rectifying any issue associated with iTunes.


Q1: Can I fix the sync session failed to start error by restarting my router?

A1: Yes, restarting your router can help address network-related issues that might be causing the error. Try power cycling your router by turning it off, waiting for a few seconds, and then turning it back on.

Q2: Will clearing the cache and data of the application delete my personal information?

A2: Clearing the cache and data of an application will not delete your personal information stored on the server. However, it will remove locally stored data, such as preferences and temporary files.

Q3: Why is it important to keep software and firmware updated?

A3: Keeping your software and firmware updated ensures that you have the latest features, bug fixes, and security patches. Outdated versions can be prone to compatibility issues and vulnerabilities.

Q4: How do I find the support contact information for the application or service I’m using?

A4: Visit the official website of the application or service and look for a “Support” or “Contact Us” page. There, you should find the necessary information to reach out to their support team.

Q5: What if the sync session failed to start error persists even after trying all the solutions mentioned?

A5: If you have exhausted all troubleshooting steps and the error persists, it is advisable to seek assistance from the application or service’s support team. They can provide further guidance based on the specific details of your situation.


These methods offer optimal solutions for resolving the issue of a failed sync session on your computer.

As some of the methods have tighter instructions, but if you follow them one by one without missing anything, then you will have all the knowledge to fix the problem in a matter of time, especially for Tenorshare TunesCare. As you can tell, the problem here is persistent.

‘Failed to start sync session’ error message may appear unexpectedly on your computer without providing any instructions on how to resolve the issue.

If you encounter issues when working with consecutive methods, you can attempt the aforementioned techniques to resolve the problem.


Ten years of experience in information and computer technology. Passionate about electronic devices, smartphones, computers, and modern technology.

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