Tell us if you can relate. You park and realize you have a few minutes to kill, so you pull out your phone. You start watching a video, only to find out your audio is being routed to your vehicle via Bluetooth. So you switch over to Bluetooth. But now the audio is out of sync with the video. Mouths move before you hear voices, and action on the screen happens before the sound effects. Out of annoyance, you hit pause, and the controls feel unresponsive as the audio continues to play for a split second.
This is due to the Bluetooth audio delay as the phone sends the audio to your vehicle. However, Tesla now has a fix. For owners of newer Tesla vehicles equipped with the AMD Ryzen MCU, Tesla is now reducing the audio delay, making video and audio stay in sync, and making Bluetooth controls more responsive.
Long in the (Blue)Tooth
All Bluetooth sources have some degree of latency between when a signal is sent from a source device (such as your phone) and when it's received and played by the speaker (such as your car). While this often goes unnoticed when listening to music alone, it becomes immediately obvious when visual cues are also involved. This delay is the primary cause of the frustrating lip-sync issues that occur when watching videos with a Bluetooth audio device.
This latency also manifests as a lack of responsiveness in media controls since the audio continues playing even after you hit pause. The delay between hitting pause, play, or skip can make the system feel sluggish, while that’s not the case at all.
A Little Fix
Tesla has shipped an undocumented change that greatly reduces this audio latency in update 2025.32. The fix specifically applies to vehicles equipped with the newer AMD Ryzen MCU (MCU 3), which is significantly faster and more powerful than the older MCU2, but that’s not the reason why it only applies to MCU 3.
MCU 3 also ships with Bluetooth 5.0 support, while MCU 2 only supports Bluetooth 4.2. Alongside the additional processing power, the difference in Bluetooth hardware is why support for this fix won’t be coming to older vehicles.
While the improvement wasn’t included in the official release notes, it comes as a pleasant surprise to owners who have long been irked by the audio lag issues.
The result is a noticeably snappier and more pleasant media experience. Videos streamed from a mobile device are now properly synced to the car audio, and media controls feel more responsive and instantaneous. While not a headline feature like the big FSD V14 update we’re all waiting for, it’s the tiny little quality of life improvements Tesla ships in its updates that really make the experience top-notch.
