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Home / DTC / U047C — Invalid Data Received From “Restraints System Sensor L”

U047C — Invalid Data Received From “Restraints System Sensor L”

Detailed page for trouble code U047C.

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Code

U047C

HYUNDAI U — Network/User

Invalid Data Received From “Restraints System Sensor L”

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

Causes

  • Faulty left restraints system sensor (impact/occupant sensor)
  • Damaged or corroded connector at the sensor or control module
  • Open, shorted or intermittent wiring between the sensor and restraints control module
  • CAN/LIN communication fault or bus contention on the vehicle network
  • Low or unstable vehicle battery voltage or poor ground
  • Control module software fault or internal module failure

Symptoms

  • SRS/Airbag warning lamp illuminated or flashing
  • Restraints control module stored U047C (left sensor invalid data) and possibly related codes
  • Left-side airbag or pretensioner may be disabled until fault is cleared and verified
  • Self-test failure on SRS system during ignition

What to check

  • Read and record all SRS and network codes with a capable scan tool; capture freeze-frame data
  • Visually inspect left-side restraint sensor, connector, and harness for damage, corrosion, water, or loose pins
  • Check battery voltage and main chassis ground condition before diagnostics (12–14 V expected)
  • Use scan tool to monitor live data from the restraints sensor and note abnormal or out-of-range values
  • Inspect CAN bus wiring and connectors; check for other modules reporting communication errors
  • Perform wiggle/torque checks on harness while monitoring live data to find intermittent faults

Signal parameters

  • Sensor power: vehicle battery nominal 11–14 V (verify at sensor connector)
  • Sensor reference/logic (if present): typically a 5 V reference — verify presence if applicable
  • CAN bus idle state: CAN_H and CAN_L should be near nominal (~2.5 V common mode) with differential signaling when active — look for noise or loss of differential signal
  • Signal output: sensor analog outputs normally within 0–5 V (manufacturer-specific). Values out of expected range indicate fault
  • Continuity/Resistance: expect low resistance to ground on ground circuit and specified resistance ranges for any dedicated sensor lines (check service manual)

Diagnostic algorithm

  1. Safety first — disable SRS system per manufacturer procedure before any connector or sensor handling; follow airbag safety precautions.
  2. Retrieve and note all SRS and network DTCs, freeze-frame and live data with a capable scan tool. Clear codes and see if U047C returns.
  3. Visually inspect the left restraints sensor and harness routing (under seat or in door pillar depending on vehicle) for damage, corrosion, or water ingress.
  4. With SRS disabled as required, disconnect the sensor connector and inspect pins for corrosion, bent pins, or damage. Reconnect and re-check for improvements.
  5. Verify supply and ground at the sensor connector with a multimeter: battery voltage on supply, good ground continuity to chassis. Repair any power/ground problems.
  6. Check signal/CAN lines at the sensor and at the restraint control module for continuity, shorts to battery/ground and proper differential signaling using a scope if possible.
  7. Wiggle test harness while monitoring live data to identify intermittent wiring faults.
  8. If wiring/power/ground are good and communication lines are healthy, replace the left restraints sensor with a known good unit or an OEM replacement per service manual.
  9. If code persists after sensor replacement, inspect or replace the restraints control module and consider reprogramming or software updates; consult manufacturer technical service bulletins.
  10. After repair, clear codes, perform any required SRS system initializations/relearns, and verify absence of codes and SRS warning lamp off.
  11. Document repairs and perform final verification test drive or system self-check.

Likely causes

  • Connector corrosion or bent pins at the left restraints sensor
  • Open/short in sensor signal or power circuit (most common)
  • Failed left restraints sensor (after physical damage or water ingress)
  • CAN communication error between sensor/module (bus fault or module conflict)

Fault status

⚠️ Status
Invalid data received from Restraints System Sensor L — corrupted, out-of-range, or no valid data reported by left restraint sensor. SRS warning lamp illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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371

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