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BLE Pairing Failed

Espressif ESP32

Severity: Moderate

Source: OnlyErrorCodes.com — Every error code. One place.

ESP32 BLE Pairing Failed — How to Fix

What Does This Error Mean?

ESP32 BLE pairing failed is usually caused by stale bonding information stored on one or both devices from a previous attempt. Delete the ESP32 from your phone or computer's Bluetooth list, reflash the ESP32 to clear its bonds, then pair from scratch.

Affected Models

  • ESP32-DevKitC
  • ESP32-WROOM-32
  • ESP32-S3
  • ESP32-C3
  • All ESP32 variants

Common Causes

  • Stale bonding keys stored on the connecting device from a previous session
  • Pairing mode not correctly configured in BLE server code
  • BLE device name conflict with another nearby ESP32
  • Connection interval settings incompatible with the phone or OS
  • NVS (non-volatile storage) on ESP32 holding old bonding data

How to Fix It