A multi-channel device with a single diagnosis status pin may be configured to detect if one or more channels has a fault. The multi-channel device, which may operate within a system, can communicate which channel, of a plurality of channels, has the fault using only a single diagnosis status pin and no additional diagnosis control pins. The multi-channel device may output a fault signal on the diagnosis status pin and in response to an interrogation input signal on the same channel as a fault channel indicate to the system which channel is the fault channel.