CAN bus error frames occur when a node detects corrupted messages, triggering error signaling that interrupts normal communication. CHEPQ analyzers not only detect these frames but categorize them into types,bit, stuff, CRC, form, or acknowledgment errors and correlate timing and frequency with network load and topology. This granular data allows technicians to differentiate between sporadic interference, wiring faults, or failing transceiver ICs. Identifying precise error types aids targeted repairs, minimizing downtime and avoiding unnecessary component replacement in complex, multi-node vehicular CAN systems.