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Home / DTC / U0478 — Invalid Data Received From “Restraints System Sensor H”

U0478 — Invalid Data Received From “Restraints System Sensor H”

Detailed page for trouble code U0478.

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U0478

HYUNDAI U — Network/User

Invalid Data Received From “Restraints System Sensor H”

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

Causes

  • Faulty Restraints System Sensor H (internal failure)
  • Damaged wiring harness or connector (open, short to ground/power, corrosion)
  • Loose or corroded connector pins at sensor or control module
  • CAN bus or network communication fault (noise, missing messages, arbitration errors)
  • Intermittent power or ground supply to the sensor
  • Software/configuration mismatch or corrupted module firmware

Symptoms

  • SRS / airbag warning lamp illuminated
  • Possible diagnostic trouble codes for related restraints modules
  • Loss of functionality for associated restraint features (seatbelt pretensioners, airbags) or warnings indicating sensor fault
  • Intermittent faults that change with vibration or movement
  • Other network modules reporting communication errors

What to check

  • Retrieve freeze frame and full DTC list with a capable scan tool; note occurrence frequency and any related U or B/C codes
  • Visually inspect the sensor connector and harness for corrosion, bent pins, water intrusion, chafing, or damage
  • Verify battery voltage and test local ground at the sensor connector
  • Check for proper CAN bus operation: presence of normal traffic, no dominant errors, and expected voltage levels
  • Compare live data from Restraints System Sensor H with adjacent restraint sensors (consistency, valid values)
  • Perform wiggle test on harness with scan tool connected to see if code is influenced by movement

Signal parameters

  • Sensor communicates over vehicle data bus (CAN) — valid periodic frames for the sensor should be present
  • Expected bus idle voltages ~2.5V differential on CAN lines; wake/active voltages per vehicle spec
  • Message frequency: sensor data frames typically repeat at a steady interval (millisecond to 100s ms range depending on network)
  • Power supply to sensor: typically battery voltage (approx. 11–14 V) when key ON
  • Ground continuity: low ohms between sensor ground pin and chassis ground
  • No excessive CRC/format errors on sensor messages when viewed with a diagnostic tool

Diagnostic algorithm

  1. Read and record all DTCs and freeze frame data. Note occurrences and related module codes.
  2. Follow safety procedures for SRS work (disable battery and wait manufacturer-specified time before disconnecting restraints wiring).
  3. Visually inspect the Restraints System Sensor H connector and harness for damage, corrosion, water ingress, or poor pin seating; repair as needed.
  4. With a scan tool, monitor live data from the sensor and observe whether its frames appear and whether values are plausible; perform a wiggle test of the harness to check for intermittent faults.
  5. Verify sensor power and ground at the connector with voltmeter/ohmmeter per manufacturer spec; repair any power/ground issues.
  6. Check CAN bus health: use a scope or CAN diagnostic tool to verify bus voltages, symmetry, termination, and message frequency; isolate bus segments if necessary.
  7. If wiring and bus are good, swap with a known-good identical sensor (if available) or substitute a spare module to confirm sensor failure, or temporarily connect a known-good module’s connector to test communications.
  8. If replacement required, install new sensor/module and clear codes. Relearn or reprogram the module if manufacturer procedure requires it.
  9. After repairs, perform a full SRS system check and ensure no other related codes remain; confirm readiness with scan tool and road test if applicable.
  10. If fault persists after parts/wiring checks, consult manufacturer service information for module-specific diagnostic flow, wiring diagrams, and software updates.

Likely causes

  • Connector or harness damage at the sensor (common)
  • Faulty sensor/module (moderate likelihood)
  • CAN bus communication error (less common but significant)
  • Missing/low battery voltage or poor ground at sensor (possible)
  • Module configuration or software issue (less likely)

Fault status

⚠️ Status
Invalid Data Received From “Restraints System Sensor H”
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

U0477 U0479 U0401 U0164
371

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