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Home / DTC / U0564 — Invalid Data Received From Speech Recognition Module

U0564 — Invalid Data Received From Speech Recognition Module

Detailed page for trouble code U0564.

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U0564

Generic U — Network/User

Invalid Data Received From Speech Recognition Module

Brand: Generic
Type: U — Network/User
Views: UK: 16 EN: 29 RU: 28
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Speech Recognition Module (SRM) software bug or corrupted internal data
  • CAN/LIN bus communication errors (noise, missing termination, high error counters)
  • Poor power or ground to the SRM (voltage spikes, brownouts, intermittent supply)
  • Damaged wiring, bent/cracked connector pins, or corrosion at the SRM connector
  • Incompatible or incomplete module programming / firmware mismatch after an update or module replacement
  • Other module on same network sending malformed messages

Symptoms

  • Speech recognition not working or returning nonsense/garbled responses
  • Infotainment or voice-control warnings or errors displayed
  • Other modules reporting SRM-related faults or degraded operation
  • Intermittent operation of voice commands
  • Possible diagnostic trouble codes stored in multiple modules (communication-related U-codes)

What to check

  • Read all stored U- and P-codes and note freeze-frame / timestamp information
  • Check vehicle electrical history: recent module replacements, software updates, or battery disconnects
  • Verify battery voltage and charging system state (check for low or noisy supply)
  • Visually inspect SRM connector, wiring harness and nearby grounds for damage or corrosion
  • Use scan tool to view live SRM data (status, message rate, values) from affected modules
  • Check other modules on same network for related communication errors

Signal parameters

  • CAN bus frames from Speech Recognition Module (SRM): periodic or on-request message IDs carrying SRM status, recognized-text identifiers, confidence and command IDs
  • Expected parameter ranges: status codes and confidence typically within defined enumerations (manufacturer-specific); out-of-range or non-enumerated values indicate invalid data
  • Typical bus bitrates: depends on vehicle (commonly 500 kbps or 250 kbps for CAN); check vehicle spec
  • Message frequency: SRM may send periodic heartbeat/status and event-driven payloads — missing heartbeats or corrupted payloads trigger U0564
  • Look for increased CAN error frames, retransmissions, or irregular timing in messages

Diagnostic algorithm

  1. Retrieve and record U0564 plus any other DTCs and freeze-frame data from all modules. Note recent events that coincide with the fault.
  2. Confirm vehicle battery voltage is within specification. Reconnect battery if low and recheck; do not proceed if charging system unstable.
  3. Inspect SRM connector & harness for corrosion, bent pins, water intrusion or physical damage. Repair or clean as required.
  4. With a capable scan tool, monitor SRM-related messages and parameters from master modules. Look for invalid values, rapid value changes or missing messages.
  5. Use an oscilloscope or CAN bus analyzer to check physical layer: idle bus voltage, differential signal amplitude, noise, and error frames. Repair wiring/termination faults if present.
  6. Check power and ground at the SRM connector (measure voltage under load, check reference ground continuity). Repair poor ground or supply wiring.
  7. If suspecting software, verify SRM and related modules have current and matching software calibrations. Reflash/update per manufacturer TSBs if available.
  8. If the SRM is accessible, perform a module reset or perform directed relearn/initialization procedures, then re-scan for the code.
  9. If invalid data persists after electrical checks and software verification, consider swapping SRM with a known-good unit (if permitted) or replace SRM. After replacement, ensure programming/configuration is correct.
  10. After repair, clear DTCs and perform functional tests of speech recognition and network stability. Road test and re-check for recurrence.

Likely causes

  • SRM software/firmware incompatibility or corruption (recent update or module replacement)
  • Intermittent CAN bus errors (wiring, grounding, or termination issue)
  • Connector corrosion or loose pin at SRM connector
  • Low supply voltage or poor ground causing data corruption
  • Failed SRM

Fault status

⚠️ Status
Communication error: Invalid data received from Speech Recognition Module (U0564). Check SRM, wiring, power/ground and module programming.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0100 U0101 U0121 U0155 U0562
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Code

U0564

HYUNDAI U — Network/User

Invalid Data Received From Speech Recognition Module

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 12 EN: 28 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Speech Recognition Module (SRM) software bug or corrupted internal data
  • CAN/LIN bus communication errors (noise, missing termination, high error counters)
  • Poor power or ground to the SRM (voltage spikes, brownouts, intermittent supply)
  • Damaged wiring, bent/cracked connector pins, or corrosion at the SRM connector
  • Incompatible or incomplete module programming / firmware mismatch after an update or module replacement
  • Other module on same network sending malformed messages

Symptoms

  • Speech recognition not working or returning nonsense/garbled responses
  • Infotainment or voice-control warnings or errors displayed
  • Other modules reporting SRM-related faults or degraded operation
  • Intermittent operation of voice commands
  • Possible diagnostic trouble codes stored in multiple modules (communication-related U-codes)

What to check

  • Read all stored U- and P-codes and note freeze-frame / timestamp information
  • Check vehicle electrical history: recent module replacements, software updates, or battery disconnects
  • Verify battery voltage and charging system state (check for low or noisy supply)
  • Visually inspect SRM connector, wiring harness and nearby grounds for damage or corrosion
  • Use scan tool to view live SRM data (status, message rate, values) from affected modules
  • Check other modules on same network for related communication errors

Signal parameters

  • CAN bus frames from Speech Recognition Module (SRM): periodic or on-request message IDs carrying SRM status, recognized-text identifiers, confidence and command IDs
  • Expected parameter ranges: status codes and confidence typically within defined enumerations (manufacturer-specific); out-of-range or non-enumerated values indicate invalid data
  • Typical bus bitrates: depends on vehicle (commonly 500 kbps or 250 kbps for CAN); check vehicle spec
  • Message frequency: SRM may send periodic heartbeat/status and event-driven payloads — missing heartbeats or corrupted payloads trigger U0564
  • Look for increased CAN error frames, retransmissions, or irregular timing in messages

Diagnostic algorithm

  1. Retrieve and record U0564 plus any other DTCs and freeze-frame data from all modules. Note recent events that coincide with the fault.
  2. Confirm vehicle battery voltage is within specification. Reconnect battery if low and recheck; do not proceed if charging system unstable.
  3. Inspect SRM connector & harness for corrosion, bent pins, water intrusion or physical damage. Repair or clean as required.
  4. With a capable scan tool, monitor SRM-related messages and parameters from master modules. Look for invalid values, rapid value changes or missing messages.
  5. Use an oscilloscope or CAN bus analyzer to check physical layer: idle bus voltage, differential signal amplitude, noise, and error frames. Repair wiring/termination faults if present.
  6. Check power and ground at the SRM connector (measure voltage under load, check reference ground continuity). Repair poor ground or supply wiring.
  7. If suspecting software, verify SRM and related modules have current and matching software calibrations. Reflash/update per manufacturer TSBs if available.
  8. If the SRM is accessible, perform a module reset or perform directed relearn/initialization procedures, then re-scan for the code.
  9. If invalid data persists after electrical checks and software verification, consider swapping SRM with a known-good unit (if permitted) or replace SRM. After replacement, ensure programming/configuration is correct.
  10. After repair, clear DTCs and perform functional tests of speech recognition and network stability. Road test and re-check for recurrence.

Likely causes

  • SRM software/firmware incompatibility or corruption (recent update or module replacement)
  • Intermittent CAN bus errors (wiring, grounding, or termination issue)
  • Connector corrosion or loose pin at SRM connector
  • Low supply voltage or poor ground causing data corruption
  • Failed SRM

Fault status

⚠️ Status
Communication error: Invalid data received from Speech Recognition Module (U0564). Check SRM, wiring, power/ground and module programming.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0100 U0101 U0121 U0155 U0562
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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