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Home / DTC / U0472 — Invalid Data Received From “Restraints System Sensor B”

U0472 — Invalid Data Received From “Restraints System Sensor B”

Detailed page for trouble code U0472.

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U0472

HYUNDAI U — Network/User

Invalid Data Received From “Restraints System Sensor B”

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Restraints System Sensor B (internal electronics)
  • Damaged wiring or poor connector/terminal at the sensor or SRS unit
  • Corroded or loose connector pins (intermittent connection)
  • Short, open, or high-resistance on CAN high/low or power/ground circuits
  • Faulty SRS control module or Gateway module interpreting the message
  • CAN bus interference or termination problem (missing/shorted bus, wrong resistance)

Symptoms

  • Airbag/SRS warning lamp illuminated
  • One or more restraint-related functions disabled or showing faults on the scan tool
  • Stored U0472 and possibly related U-codes (communication/invalid data)
  • Possible intermittent faults that clear and return with vehicle motion or vibration
  • Other modules may flag communication or invalid-data codes

What to check

  • Connect a capable scan tool and read all stored/active codes and freeze frame data
  • Record related DTCs from SRS and gateway modules (look for U0xxx and lost-communication codes)
  • Visually inspect sensor B connector, wiring, and any in-line connectors for damage, corrosion, or poor seating
  • Check SRS control module connectors and wiring harness for damage
  • Verify battery voltage and charging system health (low voltage can corrupt CAN messages)
  • Perform wiggle test of harness while monitoring live sensor data or CAN messages

Signal parameters

  • Restraints Sensor B CAN message ID — model-dependent (check factory data); message should be present at specified frequency
  • Expected message frequency: typically periodic (example 5–50 Hz) — absence or irregular timing indicates a problem
  • Data length typically 8 bytes — unexpected length or format suggests framing error
  • Payload fields contain status/position values within specified ranges; out-of-range values indicate sensor fault
  • CAN bus electrical levels: recessive state ~2.5 V on CAN-H and CAN-L; dominant state shows expected differential (~2 V); abnormal voltages indicate wiring/termination issues
  • Message contains checksum/CRC or counter — invalid CRC/counter mismatch flags corrupted data

Diagnostic algorithm

  1. Read all codes and freeze frame with a factory-level scan tool; note time stamps and driving conditions.
  2. Do not disable SRS without following manufacturer safety procedures. If required, follow factory battery disconnect and grounding steps before handling SRS connectors.
  3. Visually inspect Sensor B connector and wiring to SRS control and any intermediate junctions for damage, corrosion, pin back-out, or water intrusion.
  4. With access to live data, confirm whether Sensor B message appears on the bus and whether data values look plausible. If the message is missing or data is invalid, proceed to step 5.
  5. Perform a wiggle/physical-stress test of the harness/connectors while monitoring message presence to identify intermittent faults.
  6. Measure supply voltage and ground at the sensor connector; verify within specification. Low supply or high ground resistance can corrupt messages.
  7. Check CAN bus continuity and termination resistance (typical end-to-end ~60 Ω total). Measure CAN-H/CAN-L voltages at sensor and module connectors; look for stuck dominant/recessive states or abnormal voltages.
  8. Capture CAN waveform with an oscilloscope or CAN analyzer to verify message ID, frequency, CRC/counter, and electrical integrity. Compare to known-good waveform or factory data.
  9. If wiring and bus are good, swap in a known-good Restraints Sensor B if available, or disconnect sensor and verify that the code changes to a sensor absent/fault code — helps isolate sensor vs. bus/module.
  10. If sensor swap confirms replacement needed, replace sensor and clear codes, then perform any required SRS system initialization or calibration per manufacturer procedures.
  11. If sensor replacement did not fix the issue, investigate SRS control module or gateway module software levels and update per service bulletin; replace module only after thorough verification.
  12. After repair, erase codes, perform test drive and re-scan to confirm code does not return and SRS lamp behavior is normal.

Likely causes

  • Damaged sensor connector or wiring at the seat/side where Sensor B is located
  • Intermittent/loose connector at the Restraints control module
  • Corrosion or bent pins causing high resistance on signal or ground
  • Failed Restraints System Sensor B unit
  • CAN bus fault between sensor and control module (open/short/incorrect termination)

Fault status

⚠️ Status
Invalid data received from Restraints System Sensor B — CAN message missing, corrupted, or out-of-range. SRS fault stored; investigate sensor, wiring, CAN bus, and module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

U0471 U0401 U0415 U0155 U0100
371

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