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Home / DTC / U0495 — Invalid Data Received From Digital Audio Control Module B

U0495 — Invalid Data Received From Digital Audio Control Module B

Detailed page for trouble code U0495.

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Code

U0495

Generic U — Network/User

Invalid Data Received From Digital Audio Control Module B

Brand: Generic
Type: U — Network/User
Views: UK: 12 EN: 24 RU: 14
AI status
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Page language: EN

Causes

  • Faulty Digital Audio Control Module B (hardware or firmware)
  • Corrupt or out-of-date module software
  • Intermittent or failed CAN/LIN network connection between modules
  • Open/shorted wiring, damaged connector or poor pin contact
  • Improper module addressing or configuration (e.g., after replacement)
  • Aftermarket audio equipment or improper installation causing bus conflicts

Symptoms

  • Audio system features intermittently fail or are not available
  • Radio, media source, volume, or source selection unresponsive
  • Warning or message on cluster indicating audio or communication fault
  • Multiple related U-codes or communication errors logged
  • Loss of steering wheel audio controls or phone/media functions
  • Intermittent system behavior correlated with vibration or connector movement

What to check

  • Read all stored and pending DTCs from all modules; note freeze frame and occurrence counts
  • Check for related U-codes (other modules reporting invalid data or lost comms)
  • Visually inspect audio module connector, pins, and harness for damage, corrosion or water intrusion
  • Verify module power and ground voltages with key on and during operation
  • Inspect fuses and accessory relays supplying the audio module
  • Check for aftermarket audio components and verify integration wiring

Signal parameters

  • Message ID(s) used by Digital Audio Control Module B
  • Payload/data byte layout (e.g., source ID, volume, status flags)
  • Message frequency/update rate (Hz) and expected timing intervals
  • Message length (DLC) and expected values/ranges for each field
  • Checksum or CRC presence and correctness (if used)
  • CAN bus voltage idle levels and differential voltages

Diagnostic algorithm

  1. Capture and record DTCs from all modules and note freeze frame data; do not clear yet.
  2. Confirm occurrence: attempt to reproduce the fault by exercising audio functions and repeating the conditions in freeze frame.
  3. Inspect connectors and wiring at Digital Audio Control Module B for damage, corrosion, or loose pins; repair as needed.
  4. Verify module battery power and ground reference voltages with DMM; repair any power or ground issues.
  5. Check fuses and relays feeding the audio module; replace if blown or intermittent.
  6. Use a scan tool to observe the audio module messages on the vehicle network. Confirm message IDs, DLC and data contents match expected values from factory data.
  7. If available, use an oscilloscope to view CAN high/low waveforms at the audio module and another known-good node to detect noise, reflections, or malformed frames.
  8. Check for shorts on CAN high/low to battery or ground and measure bus termination resistance (should be ~60 ohms across CAN high/low with ignition off unless otherwise specified).
  9. Inspect for and remove/disable any aftermarket audio devices; retest for fault presence.
  10. Verify module software/calibration level against manufacturer specification and apply any required updates or reflash the module per factory procedure.
  11. If wiring, power and software are confirmed good and the module still sends invalid data, replace the Digital Audio Control Module B (replace last).
  12. After repair, clear codes and perform a full system check to ensure no related U-codes return and all audio functions operate normally.

Likely causes

  • Loose or corroded connector at the audio module
  • CAN high/low short or short to battery/ground on audio module circuit
  • Audio module firmware mismatch after software update or part replacement
  • Defective audio module that sends malformed messages
  • Failed power/ground supply to the audio module

Fault status

⚠️ Status
Invalid data was received from the Digital Audio Control Module B over the vehicle network. Messages from that module were malformed, out of range, or failed integrity checks, causing communication errors with other modules.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

U0494 U0401 U0100 U0155 U0415
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