[Solved] Apple Pencil Pro Squeeze & Hover Gesture Failure on iPad Pro 13″ M4: How to resolve Digitizer sensor BLE calibration handshake desynchronization

[Jason Jimenez]

Diagnostic Hardware Specs: iPad Pro 13″ M4 | OS Version: iPadOS 18.1 | Archive Source: Apple Support Community #256895599

I am running into a persistent issue on my iPad Pro 13″ M4 running iPadOS 18.1.
Whenever the machine encounters Digitizer sensor BLE calibration handshake desynchronization, the following diagnostic log appears in Console:

PencilService: [Bluetooth] Haptic squeeze sensor payload CRC mismatch on peripheral 0x47a7

I verified that hardware connections are intact and tested across different power sources. What is the verified diagnostic procedure to permanently eliminate this symptom?

Apple TV 4K 3rd Gen | Dual HomePod mini | iPhone 15 Pro Max | Madrid, ES

Smart Home & Matter/Thread Integrator | "Verified Apple Discussions Archive"

[Kyle Edwards]

Apple Recommended / Verified Community Solution

This canonical solution was verified and marked as solved in the Apple Support Community archive.

Forgetting Bluetooth device, cleaning magnetic inductive strip, and recalibrating Squeeze threshold.

Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

1. In Settings > Bluetooth, tap (i) next to Apple Pencil and select Forget This Device.
2. Wipe magnetic charging edge of iPad and flat edge of Apple Pencil with microfiber cloth.
3. Force restart iPad (Vol Up, Vol Down, hold Top button). Re-attach Pencil to recalibrate.

Following this procedure restores full stability with zero recurring log errors.

Mac Studio M2 Ultra (128GB) | ASUS ProArt PA32UCG-K | OWC ThunderBay 8 | Ottawa, ON

Apple Certified Support Professional (ACSP) | Final Cut Pro / DaVinci Colorist & Editor

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