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Home / DTC / U05B4 — Invalid Data Received From Driver Monitoring System Module

U05B4 — Invalid Data Received From Driver Monitoring System Module

Detailed page for trouble code U05B4.

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U05B4

Generic U — Network/User

Invalid Data Received From Driver Monitoring System Module

Brand: Generic
Type: U — Network/User
Views: UK: 9 EN: 21 RU: 17
AI status
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Page language: EN

Causes

  • Faulty DMS module (hardware or firmware)
  • Intermittent or failed CAN/LIN/FlexRay network communication
  • Damaged wiring or poor connector connection to the DMS
  • Corrupt or out-of-date module software/calibration
  • Low supply voltage or poor ground at the DMS
  • Electromagnetic interference on the vehicle network

Symptoms

  • Driver-monitoring warning or message on instrument cluster
  • Reduced or disabled features that depend on DMS (e.g., driver attention alerts, camera-based seatbelt or occupant monitoring)
  • Persistent U05B4 fault stored in network gateway or host module
  • Intermittent operation of driver-monitoring features
  • Possible related ADAS messages reduced or flagged as unavailable

What to check

  • Read all U-codes and DMS-specific codes using a capable scan tool; record freeze frame and DTC history
  • Check for additional network communication codes (CAN bus errors, lost comms)
  • Visually inspect DMS module, camera and connectors for corrosion, damage or water ingress
  • Verify DMS power and ground voltages with ignition on and during fault conditions
  • Check wiring continuity and resistance on DMS CAN/LIN/MOST lines and shield if present
  • Confirm vehicle and module software/firmware levels; check for Technical Service Bulletins (TSBs)

Signal parameters

  • Message ID and PGN (module transmit ID)
  • Data length code (DLC) and expected payload length
  • Message frequency / transmit interval (Hz or ms)
  • Checksum or CRC field validity
  • Expected value ranges for key fields (e.g., driver present flag, gaze/confidence value)
  • Sequence number or timestamp rollover behavior

Diagnostic algorithm

  1. Connect a full-function scan tool and capture all stored and pending DTCs and freeze-frame data from the DMS and gateway hosts.
  2. Note when the fault occurs (ignition state, after drive cycles, after module reflash). Check for related network or power faults.
  3. Visually inspect DMS connectors, wiring harness, and camera mounting. Repair any damaged insulation, corrosion or pin damage.
  4. Verify proper battery voltage and clean reliable ground at the DMS module. Measure supply at module harness connector with load applied.
  5. Use an oscilloscope or CAN/LIN analyzer at the DMS connector to confirm the module is transmitting messages and that frames match OEM expected ID, length, timing and CRC.
  6. If messages are present but payload fields are out of expected range or CRC fails, suspect module internal fault (camera/image processor) or corrupted firmware.
  7. If no messages are present, trace CAN bus continuity back to gateway and check termination resistors and splice connections. Repair open/shorts as needed.
  8. If wiring and power are good, attempt a factory-recommended module reset, reflash, or software update. Follow OEM calibration/initialization procedure for the DMS after replacement or software work.
  9. After repairs or updates, clear codes and perform a functional test and road test to confirm the DMS messages are valid and the U05B4 code does not return.
  10. If the problem persists and all vehicle-side wiring and power are confirmed good, consider replacing the DMS module and perform required programming and calibrations.

Likely causes

  • Corroded or loose connector at the DMS camera/module
  • Open/shorted CAN high or CAN low between DMS and main bus
  • DMS firmware mismatch after recent module replacement or update
  • Failed DMS camera/image processor producing invalid payload
  • Network termination or bus speed/configuration mismatch

Fault status

⚠️ Status
Invalid data received from Driver Monitoring System Module (DMS). Messages identified as corrupt, out-of-range, or failing validation checks; DMS output ignored by consuming modules.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0115 U0121 U0400 U0415 U0424
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