Symptoms
- Update download stalls or fails partway
- System shows an error message during update
- Update seems to install but nothing changes
- Screen goes black or restarts during the process
Likely causes
- CommonWeak or dropped Wi-Fi connectionOver-the-air updates need a stable connection for the whole download and install process.
- CommonLow 12V battery voltage during updateMany systems require the engine running or a charger connected since updates can drain the battery.
- PossibleIncorrect USB update file or drive formattingUSB-based updates often need a specific file structure and FAT32 formatting.
- Less commonInsufficient storage space on the unitSome older systems have limited internal storage that can block larger updates.
What to do
- Make sure the car is parked with the engine running (or connected to a charger) during the entire update process.
- Connect to a strong, stable Wi-Fi network rather than a weak or shared hotspot.
- For USB updates, follow the manufacturer's exact instructions for file naming and folder structure, and format the drive as FAT32.
- Do not turn off the car or disconnect power while an update is actively installing.
- If an update fails partway, restart the car and check whether it resumes or needs to be restarted from the beginning.
- If updates keep failing at home, try updating at a location with a different, more reliable Wi-Fi network.
Tools and parts
- USB flash drive (if update is via USB)
When to call a pro
If updates repeatedly fail despite good power and a stable connection, a dealer can install the update using their own equipment.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.