TECH
How an Electric Bus High-Voltage System Works
A practical overview of battery packs, contactors, precharge, DC link, inverters, traction motors, DC/DC converters, auxiliary loads and vehicle permissions.
Read technical article →Knowledge Center
Transit Bus Technical Resources
Practical explanations of battery-electric bus systems, high-voltage controls, CAN/J1939 networks and diagnostic strategy for transit maintenance professionals.
Technical knowledge
Learn the systems behind the fault codes.
These resources explain core concepts JBC uses in technician training: understand the system, verify the operating state, follow the schematic, measure safely and prove the root cause.
TECH
Understanding HVIL Faults on Electric Buses
Learn what a high-voltage interlock loop does, why an HVIL fault can prevent Ready state, and how technicians can approach diagnosis systematically and safely.
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CAN & J1939 Diagnostics for Transit Buses
A technician-focused guide to CAN physical-layer checks, termination, missing heartbeats, module power and ground, and message-based troubleshooting.
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Electric Bus Battery Management Systems Explained
Understand the role of the BMS in cell monitoring, pack limits, contactor permissions, state of charge, temperature, isolation information and diagnostics.
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Electric Bus Traction Inverter Diagnostics
Learn how traction inverters convert high-voltage DC battery power into controlled three-phase AC, manage motor torque and regenerative braking, and how technicians can systematically diagnose inverter and motor-control faults.
Read technical article →JBC technician training
Technical articles are a starting point. JBC training develops the hands-on skills needed to apply system knowledge to actual transit buses, diagnostic software, schematics, electrical measurements and network data.