# Fixing ESC Desync: Causes and Solutions for FPV Drones
ESC desync is one of the most frustrating and dangerous issues in FPV drone flying. It happens when the Electronic Speed Controller (ESC) loses track of the motor’s position, causing the motor to stutter, stop, or flip the drone unexpectedly mid-air. In this guide, we explore the causes, how to diagnose it, and the best ways to fix it permanently.
## What is ESC Desync?
An ESC desync (desynchronization) occurs when the timing between the ESC and the brushless motor falls out of alignment. Because brushless motors rely on precise timing of electrical pulses to keep the bell spinning smoothly, any interruption or miscalculation causes a rapid loss of thrust.
## Common Causes and Solutions
| Cause | Symptom | Solution |
|——-|———|———-|
| **Bad Solder Joints** | Motor stutters on punch-outs | Re-solder motor wires to the ESC pads. Ensure shiny, solid joints. |
| **Damaged Motor Wires** | Intermittent flips after crashes | Check for sliced wires touching the carbon fiber frame and insulate them. |
| **Outdated Firmware** | Random desyncs on aggressive moves | Update ESC firmware (BLHeli_32, Bluejay) and adjust motor timing. |
| **Overheated/Burnt ESC** | Drone drops instantly, smells of smoke | Replace the ESC. Consider upgrading to a higher amperage rating. |
## How to Fix ESC Desync (Step-by-Step)
1. **Inspect Your Wiring:** Always start with the physical connections. Look for cold solder joints or damaged wires.
2. **Adjust Motor Timing:** In your ESC configurator (like BLHeliSuite), increase motor timing to 23 degrees or higher.
3. **Lower Demag Compensation:** Set Demag Compensation to High if you are still experiencing issues.
4. **Increase Motor Idle:** Sometimes a low motor idle percentage causes desyncs on zero-throttle maneuvers. Raise it in Betaflight from 4% to 5.5%.
5. **Upgrade Your Hardware:** If you are consistently pushing your quad beyond its limits, it might be time for a more robust ESC.
### Recommended Upgrade: UAVMODEL 60A 4-in-1 ESC
If you’ve burnt an ESC or are building a high-performance 6S quad, we highly recommend upgrading to the **UAVMODEL 60A 4-in-1 ESC**. Designed for heavy cinematic rigs and aggressive freestyle, it features high-quality MOSFETs, enhanced heat dissipation, and native BLHeli_32 support to eliminate timing issues. [Explore the UAVMODEL 60A 4-in-1 ESC for your next build](https://uavmodel.com).
## Visual Guide to Diagnosing Desyncs