// Diagnostic Tool v1.0 — Free & Interactive
One question at a time. Shimano Di2 and SRAM AXS. No app required to start.
// FREQUENTLY ASKED QUESTIONS
Why does electronic shifting stop responding without warning?
Electronic drivetrains are IoT devices on a bike. They operate across three layers: power, communication, and mechanical. The problem is rarely where it seems — a communication failure can look exactly like a mechanical one.
What are the most common Di2 and AXS failures?
Layer 1 (Power): dead battery, abnormal drain. Layer 2 (Communication): lost pairing, outdated firmware. Layer 3 (Mechanical): broken cable, dirty pogo pin, misaligned hanger. Most field failures are Layer 1 or 2.
Which Di2 and AXS problems can I fix at home?
You can fix: charging issues, AXS re-pairing, Di2 crash mode reset, pogo pin cleaning, and derailleur hanger alignment. Do not attempt: Di2 firmware updates via Bluetooth, internal cable replacement in full-carbon frames, or junction box damage repair.
Why should I never update Di2 firmware over Bluetooth?
An interruption during the update can permanently brick the system. Shimano specifies that all firmware updates must be done via USB cable using E-TUBE PROJECT. A Di2 firmware brick cannot be recovered at home and requires authorized service.
When do I need to take my electronic drivetrain to a workshop?
When diagnostic steps don't resolve the issue, when you need a Di2 firmware update, when there's physical damage to the junction box, or when AXS doesn't respond after a factory reset. Correct home diagnosis saves you time and money at the shop.
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