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Home / DTC / U0477 — Invalid Data Received From “Restraints System Sensor G”

U0477 — Invalid Data Received From “Restraints System Sensor G”

Detailed page for trouble code U0477.

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U0477

HYUNDAI U — Network/User

Invalid Data Received From “Restraints System Sensor G”

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

Causes

  • Faulty Restraints System Sensor G module
  • Intermittent or open/shorted wiring between the sensor and the SRS/CAN gateway
  • Corroded or loose connectors at the sensor or gateway/controllers
  • Low or unstable vehicle battery/charging voltage during communication
  • CAN bus errors (noise, missing termination, short to voltage/ground)
  • Software mismatch, corrupted firmware, or module configuration error

Symptoms

  • SRS/Airbag warning lamp illuminated or flashing
  • Related restraint system functions disabled or in a reduced mode
  • Multiple restraint-related or network communication DTCs present
  • Possible historical intermittent faults that clear and return
  • No obvious mechanical symptom other than dash warning lamp

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scan tool
  • Check battery voltage and charging system (vehicle at rest and cranking)
  • Inspect connector and wiring for Restraints System Sensor G for corrosion, damage, pin push-out, or water intrusion
  • Check for recent repairs or aftermarket electronics that could affect the CAN bus
  • Scan other modules for communication faults or bus-off conditions
  • Perform visual inspection and wiggle test while monitoring data for changes

Signal parameters

  • CAN bus node 'alive' message frequency (expected periodic heartbeat from sensor)
  • Message CAN ID assigned to Restraints System Sensor G
  • Data length (DLC) expected and key bytes (status, checksum, sensor state)
  • Bus voltage idle levels ~2.5 V differential (CAN_H/CAN_L) and dominant/recessive behavior
  • Error counters and bus-off status in gateway/SRS controller
  • Checksum or CRC validity within sensor message (if applicable)

Diagnostic algorithm

  1. Retrieve all network and SRS-related codes from all modules; note time stamps and freeze frame.
  2. Verify battery voltage (12.4–12.7 V at rest) and charging system; recharge or replace battery if low or unstable.
  3. Inspect the physical connector and harness for Restraints System Sensor G. Repair any corrosion, bent pins, or insulation damage. Secure connectors and reseat.
  4. With ignition ON, monitor live data/messages from the sensor using a CAN-capable scan tool. Look for the sensor’s alive message, message frequency, and valid payload values. Note if message is intermittent or contains invalid bytes.
  5. Perform wiggle and backprobe tests: manipulate wiring and connector while monitoring data to reproduce fault and locate intermittent wiring failure.
  6. Measure CAN bus voltages at the sensor connector (CAN_H/CAN_L) and check for proper termination and no shorts to battery/ground.
  7. If wiring and bus are good but invalid data persists, try replacing or swapping the suspected sensor module (if available) or perform module reset/reflash per manufacturer service information.
  8. Check for and remove any aftermarket devices tied into the network; clear codes and perform a road/functional test to verify repair.
  9. If communication errors continue, inspect/replace the SRS gateway or related control modules per manufacturer diagnostics and service procedures.
  10. After repair, clear codes and verify the SRS light remains off and that no new U-codes reappear. Document repairs and test results.

Likely causes

  • Damaged connector or wiring harness to Restraints System Sensor G (most common)
  • Water intrusion/corrosion at sensor connector
  • Failed sensor module (internal fault)
  • CAN bus messaging interference from another module or aftermarket device
  • Vehicle battery/charging irregularity causing data corruption

Fault status

⚠️ Status
Invalid data received from Restraints System Sensor G — SRS module receiving corrupted or unexpected CAN message payload from that sensor node.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

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371

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