CAN Bus Engineering Tools
Simulate traffic, calculate bus load, decode J1939, and isolate faults — the tools engineers actually need when working with CAN.
CAN Simulator
Simulate virtual CAN bus traffic in your browser. Define ECU nodes, set message timing, and watch live bus activity.
Bus Load Calculator
Calculate bus utilization, worst-case message latency, and network health scoring for standard and extended CAN frames.
J1939 PGN Decoder
Decode and convert J1939 PGNs from 29-bit CAN IDs. Look up parameter group definitions, SPN scaling factors, and rates.
CAN Troubleshooting Guide
Step-by-step multimeter tests for termination resistance, CAN_H/CAN_L voltage levels, and node transceiver checks.
Plus 15 More CAN Bus Tools
Diagnostic, design, and reference tools at tools.canbusacademy.com
Bus Doctor AI
AI-guided fault isolation
Describe your symptoms and get a step-by-step diagnosis. The AI walks you through systematic fault isolation based on your specific situation — termination, voltage, transceiver, or wiring problems.
Stress Test
Fault simulation & waveforms
Simulate fault conditions — termination failures, EMI, ground offset — and see their effect on CAN_H/CAN_L waveforms in real-time.
Signal Maps
DBC editor & signal database
Create and edit CAN signal databases. Map raw bytes to named signals with scaling, offset, and unit definitions. Export as DBC files for use with other tools.
Cable Calculator
Max cable length calculator
Enter baud rate and node count to calculate safe cable distances. Design networks that work reliably the first time.
Live Capture
Real-time CAN bus monitoring
Capture and analyze CAN bus traffic in real-time from USB-CAN adapters via WebSerial. Filter, decode, and export live data.
Data Analyzer
Log file analysis & charts
Import CAN log files, filter by ID, search for patterns, and isolate fault events. Turn hours of scrolling into minutes of targeted analysis.
Message Decoder
OBD-II & J1939 decode
Paste raw CAN frames and instantly decode OBD-II PIDs and J1939 PGNs. See human-readable signal values without digging through spec sheets.
Arbitration Simulator
Understand message priority
Watch how multiple CAN nodes compete for bus access through the arbitration process. This animation breaks down the bit-by-bit comparison that determines message priority.
Bit Timing
Sample point optimization
Understand how a CAN bit is divided into time segments and why sample point matters. Adjust timing parameters interactively to see their effect on reliable communication.
Error State Machine
Bus-off explained
Explore Error-Active, Error-Passive, and Bus-Off states. Understand how TEC/REC error counters drive state transitions and what each state means for your network.
Fault Pattern Library
Visual fault reference
A visual reference library of common CAN bus faults with annotated oscilloscope waveforms. Match what you see on your scope to known fault signatures.
Topology Designer
Network layout builder
Create a visual diagram of your CAN bus network showing nodes, stub lengths, and termination points. Export for documentation or use during troubleshooting.
Network Designer
System architecture tool
Design complete CAN bus networks with node placement, message definitions, and wiring specifications. Plan before you build.
J1939 Reference
Interactive protocol guide
Searchable J1939 protocol guide — PGN/SPN lookup, message structure, transport protocol, and diagnostic trouble codes. Find what you need in seconds instead of the 1000+ page spec.
Oscilloscope Guide
Waveform interpretation
Learn to interpret CAN bus waveforms on an oscilloscope. See what healthy and faulty signals look like, and correlate scope readings to specific fault conditions.
Built by CAN Bus Engineers
Every tool on this page comes from real problems — validating bus load on a new ECU design, decoding PGNs from a J1939 trace, or isolating a dead bus with a multimeter. We built what we needed and couldn’t find.
The tools cover automotive, heavy-duty (J1939), and industrial CAN networks. They’re designed to give you answers in minutes, not hours of reading spec sheets or wrestling with expensive desktop software.
Free to Start, Pro When You Need It
Every tool works immediately — no signup wall. Pro unlocks the full feature set: unlimited messages, complete J1939 PGN database, batch decoding, advanced fault scenarios, and export across all tools.
Go Deeper with CAN Bus Training
Tools get you answers. Training makes you the person who doesn’t need the tools. Our CAN bus courses cover protocol fundamentals, physical-layer diagnostics, and J1939 application-layer analysis.