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Home / DTC / U047B — Invalid Data Received From “Restraints System Sensor K”

U047B — Invalid Data Received From “Restraints System Sensor K”

Detailed page for trouble code U047B.

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Code

U047B

HYUNDAI U — Network/User

Invalid Data Received From “Restraints System Sensor K”

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

Causes

  • Faulty Restraints System Sensor K (internal failure)
  • Restraints control module (RCM/SRS ECU) software or hardware fault
  • Corroded, loose or damaged connector at the sensor or control module
  • Damaged wiring (open/short to power/ground/CAN lines) between sensor and module
  • CAN/LIN network interference, missing termination, or bus short
  • Low battery voltage or poor ground

Symptoms

  • SRS/airbag warning lamp ON (steady or flashing)
  • Possible related restraint system features disabled (seatbelt pretensioners, airbags)
  • Stored U047B and possibly other U-codes related to restraints or CAN
  • Occasional or persistent communications warnings for other modules
  • Vehicle may store freeze frame or network scan tool messages at time of fault

What to check

  • Read all stored DTCs and freeze frame data with a capable scan tool (SRS protocols)
  • Note any other network/communication codes (U0xxx, U01xx, U0121, etc.)
  • Check battery voltage and perform battery load test if low (
  • Visually inspect connectors and wiring at the sensor, seat/impact area, and RCM
  • Check for recent collision repairs, seat removal, or airbag work
  • Confirm correct module part numbers and software level (consult OEM info/TSBs)

Signal parameters

  • CAN bus idle: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both recessive)
  • CAN dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
  • Typical vehicle CAN bus speeds: commonly 250 kbps or 500 kbps (confirm OEM)
  • Valid restraints sensor messages: well-formed CAN frames with expected ID and checksum — malformed frames or missing fields indicate invalid data
  • Expected message frequency: sensor update rates vary (often 10–100 Hz); missing or sporadic messages can trigger U047B

Diagnostic algorithm

  1. Retrieve and record all DTCs and freeze-frame data. Note occurrence pattern and history.
  2. Clear codes and attempt to reproduce. If U047B returns, continue diagnostics.
  3. Verify vehicle battery voltage and ground integrity. Recharge or replace battery if voltage is low.
  4. Perform a visual inspection of the restraints sensor connectors, harnesses (seat/impact area), and RCM connectors for damage, corrosion, pinbacking or loose terminals.
  5. Wiggle test harnesses while monitoring live data/messages with a scan tool to detect intermittent connections.
  6. Using a digital multimeter and/ or oscilloscope, measure CAN_H and CAN_L at the sensor connector and at the restraints control module. Compare voltages/waveforms to known-good values and confirm proper bus termination.
  7. Check continuity and resistance of the signal and ground wires between sensor and module. Look for shorts to battery or chassis ground.
  8. If physical wiring and bus signals are good at the module but invalid at the sensor, swap or bench-test the sensor (if supported) or replace sensor harness/connector.
  9. If the sensor and wiring appear good, verify RCM software/calibration level. Reflash or update RCM software per OEM procedures if required.
  10. Replace the faulty component only after verifying cause (sensor or RCM). After repairs, clear codes and confirm no return; perform full SRS system check per OEM service manual.
  11. If multiple modules show communication errors, inspect overall CAN bus (terminators, multiple shorts) and consult wiring diagrams/technical service bulletins.

Likely causes

  • Intermittent wiring fault on the sensor data/CAN pair
  • Connector pincorrosion or loose terminal at the sensor or RCM
  • Failed sensor electronics producing malformed/invalid frames
  • Loss of proper reference voltage or ground to the sensor
  • Software mismatch after module replacement or incomplete reflash

Fault status

⚠️ Status
Invalid data received from Restraints System Sensor K — data integrity/communication fault detected on restraints sensor K circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0470 U0415 U0100 U0073 U0121 U0155
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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