Code
U0472
Generic
U — Network/User
Invalid Data Received From Restraints System Sensor B
AI status
Completed
Completed
100%
Causes
- Faulty restraints system sensor (Sensor B)
- Damaged, corroded or disconnected connector at the sensor or restraints control module
- Broken, shorted or intermittent wiring/harness between sensor and control module
- Low or unstable vehicle battery/charging voltage during communication
- CAN/LIN data bus communication fault (terminals, resistance, grounding)
- Software mismatch or corrupted calibration in restraints or network module
Symptoms
- SRS/airbag warning lamp illuminated or flashing
- One or more restraints-related DTCs stored (U0472 and possibly related codes)
- Restraints system disabled or limited (may show service required)
- Other modules reporting communication errors or reduced functionality
- Possible inability to complete vehicle safety inspections
What to check
- Retrieve freeze frame data and all stored/related DTCs with a capable scan tool
- Verify battery voltage and charging system health (12.0–14.8 V typical during tests)
- Visually inspect connectors and wiring at restraints sensor B and restraints control module
- Check for bent pins, corrosion, pushed-back terminals or water intrusion
- Monitor live data / network messages for sensor B using a scan tool (message frequency and values)
- Check CAN/LIN bus integrity: termination resistance, shorts to ground/power, and continuity
Signal parameters
- Message type: digital network message (usually CAN) from sensor or pre‑processor to restraints control module
- Expected message frequency: commonly between 5–50 Hz (varies by make/model); missing or irregular timing indicates fault
- Data integrity: valid checksum/CRC and expected byte format — corrupted or malformed frames trigger U0472
- Typical live-data: sensor values within expected physical ranges (e.g., accelerometer, impact, occupant presence) — outliers indicate bad sensor
- Electrical: bus idle and dominant states convey standard CAN levels (use oscilloscope or bus monitor to verify)
- Power rails: sensor supply and ground should be stable during operation (no excessive noise or dropouts)
Diagnostic algorithm
- Read and record U0472 plus any additional DTCs and freeze frame data with a manufacturer-capable scan tool.
- Do not service SRS components without following safety procedures. Disconnect battery and wait manufacturer-specified time before accessing connectors, if required.
- Verify battery voltage and charging system; ensure stable supply during testing.
- Visually inspect sensor B connector and wiring including pins for corrosion, damage, or pushed-out terminals. Repair as needed.
- Reconnect and clear codes. Recheck to see if code returns. If intermittent, proceed with further testing.
- Use a scan tool to monitor live data and the network. Confirm sensor B messages are present at expected frequency and values; note any malformed frames or stale data.
- If messages are missing or corrupted, trace wiring from sensor B to the restraints control module. Check continuity, shorts to power/ground, and resistance.
- Inspect/measure CAN bus (or relevant network) for proper termination resistance and valid signal waveform with oscilloscope or CAN analyzer.
- If wiring and bus are good but messages are still invalid, swap with a known-good sensor B (if available) or connect a good module to confirm replacement necessity.
- If replacement sensor corrects the fault, install new sensor and clear codes. If fault persists, investigate restraints control module software and update or consider module replacement only after confirmation.
- After repairs, perform full system scan, clear codes, and perform self-tests or acceptance tests per manufacturer procedure. Verify no new faults and that SRS lamp is extinguished.
Likely causes
- Corroded/loose connector at sensor or control module
- Broken or shorted harness to sensor B
- Failed restraints sensor B
- CAN bus wiring fault or missing termination
- Intermittent low battery/ground condition causing communication errors
Fault status
Status
Invalid data received from restraints system sensor B — message missing, corrupted, out-of-range, or fails integrity checks.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
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Code
U0472
HYUNDAI
U — Network/User
Invalid Data Received From “Restraints System Sensor B”
AI status
Completed
Completed
100%
Causes
- Faulty restraints system sensor (Sensor B)
- Damaged, corroded or disconnected connector at the sensor or restraints control module
- Broken, shorted or intermittent wiring/harness between sensor and control module
- Low or unstable vehicle battery/charging voltage during communication
- CAN/LIN data bus communication fault (terminals, resistance, grounding)
- Software mismatch or corrupted calibration in restraints or network module
Symptoms
- SRS/airbag warning lamp illuminated or flashing
- One or more restraints-related DTCs stored (U0472 and possibly related codes)
- Restraints system disabled or limited (may show service required)
- Other modules reporting communication errors or reduced functionality
- Possible inability to complete vehicle safety inspections
What to check
- Retrieve freeze frame data and all stored/related DTCs with a capable scan tool
- Verify battery voltage and charging system health (12.0–14.8 V typical during tests)
- Visually inspect connectors and wiring at restraints sensor B and restraints control module
- Check for bent pins, corrosion, pushed-back terminals or water intrusion
- Monitor live data / network messages for sensor B using a scan tool (message frequency and values)
- Check CAN/LIN bus integrity: termination resistance, shorts to ground/power, and continuity
Signal parameters
- Message type: digital network message (usually CAN) from sensor or pre‑processor to restraints control module
- Expected message frequency: commonly between 5–50 Hz (varies by make/model); missing or irregular timing indicates fault
- Data integrity: valid checksum/CRC and expected byte format — corrupted or malformed frames trigger U0472
- Typical live-data: sensor values within expected physical ranges (e.g., accelerometer, impact, occupant presence) — outliers indicate bad sensor
- Electrical: bus idle and dominant states convey standard CAN levels (use oscilloscope or bus monitor to verify)
- Power rails: sensor supply and ground should be stable during operation (no excessive noise or dropouts)
Diagnostic algorithm
- Read and record U0472 plus any additional DTCs and freeze frame data with a manufacturer-capable scan tool.
- Do not service SRS components without following safety procedures. Disconnect battery and wait manufacturer-specified time before accessing connectors, if required.
- Verify battery voltage and charging system; ensure stable supply during testing.
- Visually inspect sensor B connector and wiring including pins for corrosion, damage, or pushed-out terminals. Repair as needed.
- Reconnect and clear codes. Recheck to see if code returns. If intermittent, proceed with further testing.
- Use a scan tool to monitor live data and the network. Confirm sensor B messages are present at expected frequency and values; note any malformed frames or stale data.
- If messages are missing or corrupted, trace wiring from sensor B to the restraints control module. Check continuity, shorts to power/ground, and resistance.
- Inspect/measure CAN bus (or relevant network) for proper termination resistance and valid signal waveform with oscilloscope or CAN analyzer.
- If wiring and bus are good but messages are still invalid, swap with a known-good sensor B (if available) or connect a good module to confirm replacement necessity.
- If replacement sensor corrects the fault, install new sensor and clear codes. If fault persists, investigate restraints control module software and update or consider module replacement only after confirmation.
- After repairs, perform full system scan, clear codes, and perform self-tests or acceptance tests per manufacturer procedure. Verify no new faults and that SRS lamp is extinguished.
Likely causes
- Corroded/loose connector at sensor or control module
- Broken or shorted harness to sensor B
- Failed restraints sensor B
- CAN bus wiring fault or missing termination
- Intermittent low battery/ground condition causing communication errors
Fault status
Status
Invalid data received from restraints system sensor B — message missing, corrupted, out-of-range, or fails integrity checks.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
371
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