U0559 means a control module on the vehicle communication network has received data from the radio transceiver module that is missing, out of range, or otherwise invalid. The receiving module flags the message as unreliable rather than detecting a complete loss of communication. This usually points to the radio transceiver or its network connection rather than the engine computer.
Internal electronics in the radio transceiver or head unit can fail or corrupt the data stream it transmits, causing receiving modules to reject the message. This is the single most common root cause for this specific code.
Open circuits, shorts to power or ground, corroded pins, or poor terminal contact in the harness can distort or interrupt the serial data signal without fully killing communication.
Voltage below specification during cranking or charging-system faults can cause modules to send garbled or incomplete messages; the transceiver may log the invalid-data fault before other modules do.
Non-original radios, adapters, amplifiers, or remote-start interfaces can alter the data bus load or send incompatible messages, leading a factory module to flag U0559.
Outdated firmware in the transceiver or a receiving module can cause message-format mismatches; a manufacturer software update may resolve the fault without hardware replacement.
A central gateway module that routes messages between buses can, in rare cases, corrupt data passing to or from the transceiver. The engine computer (PCM/ECM) is almost never the cause.
Usually yes. This is primarily an infotainment/telematics communication fault and typically does not affect engine performance or braking. However, if other warning lights or drivability problems appear, have the vehicle checked promptly.
Not necessarily. Start with voltage checks, wiring inspections, and software updates. The transceiver module may need replacement, but wiring or power-supply issues are common and cheaper to rule out first.
Yes. Non-original head units, wiring adapters, and add-on amplifiers or remote-start modules can place incorrect signals or electrical loads on the data bus and trigger invalid-data faults.
Almost never. U0559 describes invalid data from the radio transceiver, not an internal engine-computer failure. PCM replacement for this code is usually misdiagnosis; verify the transceiver, wiring, and network integrity before considering any control-module replacement.