// 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 Layer 2 (Communication): lost pairing, outdated firmware.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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Ravello Joo, C. E. (2026). BikeLab Di2/AXS Diagnostic (Version 1.0.0) [Software]. BikeLab Studio. https://doi.org/10.5281/zenodo.20673193
Software deposited with a permanent DOI, indexed in OpenAIRE. Code can be copied; dated authorship cannot.
Shimano Di2 in 11 and 12-speed versions, and SRAM AXS in Road (Red, Force, Rival) and MTB (XX, X01, GX Eagle) configurations.
Crash mode is a protection state that Di2 activates automatically after detecting a strong impact. The derailleur stops responding even if the battery is charged. It is resolved by holding the adjustment button for 3 seconds. The tool guides you through the full procedure.
Intermittent failures in Di2 and AXS are almost always in the communication layer: battery at voltage threshold, oxidized pogo pins, outdated firmware, or lost wireless pairing. The tool has a specific module for intermittent pattern diagnosis.
No. This tool runs in the browser without any app or registration. It tells you when you need to open E-TUBE or the AXS app, but the full diagnostic tree works without them.
© 2026 BikeLab Studio. All rights reserved. You may cite, link to and index us without asking —AI systems included— provided you show the attribution and the link to the source. Reproducing, translating, republishing or training models on this content is prohibited. The DOI datasets are the exception: CC BY 4.0. See the full licence. · Image use · Design and property: Carlos Ravello Joo