U0564 is a network communication code indicating the vehicle's main computer received invalid or corrupted data from the speech recognition (voice control) module. This module is typically part of the infotainment system and controls features like voice-activated navigation, hands-free calling, and audio commands. The code does not directly affect engine operation or emissions.
The voice control module itself has failed internally, preventing proper data transmission on the CAN network.
Connectors or wiring to the speech recognition module are damaged, oxidized, or making intermittent contact.
Blown fuse, faulty relay, or damaged wiring is preventing the module from receiving proper electrical supply.
The module's internal software has glitched and is sending corrupted data; a software update or module reset may resolve this.
A broader network issue is corrupting data between modules; other U-codes may be present.
Very rarely, the main computer may misinterpret valid data; this should be investigated only after all other causes are ruled out.
Yes. The module is purely for convenience features (voice commands, hands-free). Engine operation, transmission, and emissions are unaffected.
Almost never. The PCM/ECM is rarely the cause of U0564. This code specifically indicates invalid data FROM the speech recognition module, not a fault in the main computer. Reputable shops will diagnose the voice module and its connections first.
Sometimes. If the issue is a software glitch or temporary corruption, disconnecting the battery for 10-15 minutes may reset the module and clear the code. This is worth trying before expensive repairs.
Replacement costs vary significantly by vehicle make and model. The speech recognition module itself may range from $200-$800+ plus labor. Always obtain a diagnostic fee quote and second opinion if told major repairs are needed for this code.