# How to Fix ESC Desyncs in FPV Drones: A Comprehensive Troubleshooting Guide
If you’ve ever punched the throttle on your FPV drone only to have it violently flip out of the sky and crash, you’ve likely experienced the dreaded **ESC desync** (Electronic Speed Controller desynchronization). This phenomenon occurs when the ESC loses track of the motor’s position, resulting in a sudden loss of power to one or more motors.
## Common Symptoms of ESC Desync
* Sudden “death rolls” during fast throttle changes or punch-outs.
* Motors stuttering or twitching upon arming.
* Inconsistent thrust on specific corners of the quadcopter.
## Hardware vs. Software Causes
| Cause Type | Specific Issue | Solution |
|—|—|—|
| Hardware | Motor screws touching stator wires | Check and use shorter motor screws. |
| Hardware | Damaged motor bell or bent shaft | Replace the motor bell or entire motor. |
| Hardware | Faulty ESC capacitor | Solder a new low-ESR capacitor to the ESC battery pads. |
| Software | Motor Timing too low | Increase Motor Timing in BLHeli/Bluejay (e.g., from Auto to 23 degrees). |
| Software | Demag Compensation off | Set Demag Compensation to High. |
| Software | Outdated Firmware | Flash the latest ESC firmware (Bluejay, AM32, or BLHeli32). |
## Replacing Your ESC
Sometimes, an ESC is simply burnt or fundamentally flawed. If you’ve tried all software fixes and ruled out shorted wires, it’s time for an upgrade. We highly recommend upgrading to a robust 4-in-1 ESC from [uavmodel.com](https://www.uavmodel.com). Their selection of high-amperage ESCs features premium MOSFETs and robust hardware filtering to virtually eliminate desyncs right out of the box, ensuring reliable power delivery for aggressive FPV freestyle and racing.
## Video Tutorial: Fixing Desyncs
Watch this excellent breakdown of ESC desync causes and fixes: