| Previous | Next |
| kIOFireWireBadSelfIDs | kIOFireWireInsufficientPower |
kIOFireWireLowCableVoltage
A physical-layer power observation
kIOFireWireLowCableVoltage is a FireWire-family status about cable power, not a malformed asynchronous transaction or an isochronous-channel allocation. It points to an electrical or power-delivery condition observed by the controller path that can affect enumeration, bus stability, and device operation.
This is distinct from kIOFireWireInsufficientPower, which concerns whether enough power is available for an operation or device context. A low-voltage observation should be investigated at the cable, bus-power, adapter, and topology level before software retries are treated as a remedy.
Check the physical path
- Record the controller, cable route, hubs or repeaters, external power state, and whether the event coincided with device connection or load change.
- Compare behavior with a known-good cable and a stable externally powered path where the hardware supports it.
- Correlate the status with bus resets, disconnects, and configuration-ROM failures.
- Do not diagnose the code as a data-protocol checksum or response-length error; it belongs to the power/topology layer.
References
- Apple: IOFireWireFamilyCommon.h
- Apple: IOFireWireDeviceInterface
- Linux kernel: FireWire driver interface guide
Looking for a different code? Search another status or error code.