CAN Opener SE

Turn your vehicle into a platform.

CAN Opener SE is a compact OBD-II adapter that gives you direct access to your vehicle's CAN network and connects it to modern software.

Plug it into your OBD-II port and connect over Bluetooth or Wi-Fi to read vehicle data, run diagnostics, experiment with CAN, and build your own automotive applications. No permanent wiring. No teardown. Just plug it in and start exploring.

Built around the ESP32-C5, CAN Opener SE provides two CAN FD channels and is designed for fast, reliable communication between your vehicle and your phone, computer, or custom software.

Features

• 2× CAN FD channels via OBD-II
• Dual band Wi-Fi 6 and Bluetooth Low Energy
• ESP32-C5 processor
• 12–24V vehicle power through OBD-II
• USB-C interface
• Addressable RGB status indicator
• Unlocked for custom software and development

What's in the Box

• CAN Opener SE adapter

Compatibility

CAN Opener SE works with any OBD-II equipped vehicle manufactured from 1996 onward. CAN FD channels require vehicles with CAN FD-capable networks (common in newer vehicles from ~2018+). Bench testing and custom CAN setups are also supported.

Whether you're diagnosing a problem, building your own dashboard, logging vehicle data, or experimenting with automotive systems, CAN Opener SE gives you the hardware layer to start building.

Documentation

See GitHub

Important Legal & Safety Information

CAN Opener SE is a development, diagnostics, research, and automotive communication tool intended for developers, engineers, technicians, security researchers, automotive enthusiasts, and other users who understand vehicle electrical systems and CAN/CAN FD networks.

CAN Opener SE is not a safety device and should not be relied upon for the safe operation of a vehicle.

Connecting hardware or software to a vehicle network can affect vehicle behavior. Monitoring, transmitting, injecting, replaying, modifying, or otherwise interacting with CAN, CAN FD, ECUs, diagnostic systems, or other vehicle networks may affect vehicle operation, including but not limited to steering, braking, acceleration, airbags and restraint systems, driver-assistance systems, immobilizers, alarms, powertrain systems, charging systems, emissions systems, and other safety-critical or regulated functions.

Improper installation, configuration, wiring, software, firmware, commands, testing procedures, or use of CAN Opener SE may result in vehicle damage, property damage, loss of vehicle control, bodily injury, or death.

Use at Your Own Risk

By purchasing, possessing, installing, connecting, configuring, programming, powering, or using CAN Opener SE, you acknowledge and accept the risks associated with working with vehicle electrical and communication systems.

You are solely responsible for determining whether CAN Opener SE is appropriate for your intended application, vehicle, test environment, wiring configuration, firmware, software, and use case.

Any connection to or use with a vehicle, ECU, vehicle subsystem, bench setup, diagnostic connector, or CAN network is performed entirely at your own risk.

Lawful Use Only

CAN Opener SE is intended only for lawful development, diagnostics, interoperability, research, education, repair, and testing.

You are responsible for complying with all laws, regulations, manufacturer requirements, safety requirements, emissions regulations, cybersecurity laws, privacy laws, and other rules that may apply to your use of the product.

CAN Opener does not authorize or encourage use of the product to gain unauthorized access to vehicles or systems or to unlawfully bypass, disable, defeat, circumvent, or interfere with:

• Vehicle safety systems
• Steering or braking systems
• Airbags or restraint systems
• Driver-assistance systems
• Immobilizers, alarms, or security systems
• Emissions or emissions-monitoring systems
• Manufacturer or dealership security controls
• Access controls or authentication systems
• Licensing, subscription, or feature-activation systems
• Any other regulated or safety-critical vehicle function

Only interact with vehicles and systems that you own or for which you have explicit authorization.

Testing & Vehicle Safety

Do not perform experimental CAN transmission, injection, replay, modification, or other potentially vehicle-affecting testing while driving on public roads.

Testing that could affect vehicle behavior should be performed in an appropriate controlled environment with suitable safety precautions.

Always verify wiring, voltage, polarity, grounding, CAN termination, and connector pinout before connecting CAN Opener SE.

No Guarantee of Vehicle Compatibility

Vehicle networks, protocols, implementations, message definitions, ECUs, firmware, and manufacturer systems vary significantly.

CAN Opener makes no guarantee that CAN Opener SE, Nexus, vehicle profiles, community mappings, decoded signals, diagnostic functions, software, or firmware will be accurate, complete, compatible, or safe for any particular vehicle or application.

Community-created or user-submitted CAN mappings and vehicle profiles may contain errors. Users are responsible for independently validating any signal definition, command, mapping, diagnostic request, or vehicle behavior before relying upon it.

Development Hardware

CAN Opener SE is development hardware intended for experimentation, development, diagnostics, and research. Features, firmware, software, APIs, vehicle mappings, and functionality may change as the platform develops.

Unless expressly stated otherwise, CAN Opener SE is not an OEM-approved vehicle component and is not affiliated with or endorsed by any vehicle manufacturer.

Limitation of Liability

To the maximum extent permitted by applicable law, CAN Opener and its owners, employees, contractors, contributors, affiliates, and representatives shall not be responsible or liable for vehicle damage, ECU damage, electrical damage, wiring damage, battery discharge, loss of data, loss of vehicle functionality, loss of vehicle value, property damage, personal injury, death, fines, penalties, lost profits, or any other direct or indirect loss arising from or related to the installation, connection, configuration, programming, possession, use, misuse, or inability to use CAN Opener SE, Nexus, associated software, firmware, documentation, vehicle profiles, or community-provided data.

No Warranty

Except for any warranty expressly provided by CAN Opener or required by applicable law, CAN Opener SE, its firmware, software, documentation, mappings, APIs, and related services are provided on an "as available" basis without guarantees regarding compatibility, accuracy, reliability, uninterrupted operation, fitness for a particular purpose, or achievement of any particular result.

User Responsibility

You are responsible for the actions performed using CAN Opener SE and for anyone you permit to use the product.

By purchasing or using CAN Opener SE, you acknowledge that you have read and understood this disclaimer and agree to use the product responsibly, safely, and lawfully.

If you do not understand the risks associated with connecting to or modifying vehicle communication networks, do not use CAN Opener SE on a live vehicle.