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Home / DTC / U047F — Invalid Data Received From Seatbelt Pretensioner Module “A”

U047F — Invalid Data Received From Seatbelt Pretensioner Module “A”

Detailed page for trouble code U047F.

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Code

U047F

HYUNDAI U — Network/User

Invalid Data Received From Seatbelt Pretensioner Module “A”

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

Causes

  • Faulty seatbelt pretensioner module (internal electronics)
  • Intermittent or failed CAN/LIN communication between pretensioner module and SRS/BCM
  • Damaged, corroded or loose connector(s) at the pretensioner module or harness
  • Short, open, or high-resistance wiring in power, ground or data lines
  • Low battery voltage or unstable supply to SRS modules
  • Incorrect or incompatible replacement module or software mismatch

Symptoms

  • SRS / airbag warning lamp (and/or seatbelt indicator) illuminated
  • One or more SRS-related DTCs stored in crash/airbag control module
  • Seatbelt pretensioner may be disabled (no activation during crash event)
  • Possible intermittent communication-related faults or other U-codes present
  • Vehicle may refuse reset of SRS lamp until fault is resolved

What to check

  • Read all stored DTCs and freeze-frame data from SRS and network modules with a capable scan tool
  • Check for other communication (U0xxx) or SRS (Bxxxx) trouble codes that point to a common bus fault
  • Visually inspect pretensioner module connector, harness and pins for corrosion, damage, or bent pins
  • Verify battery voltage and health; ensure good chassis/body ground connections
  • Check power and ground at the pretensioner module connector (while following SRS safety procedures)
  • Check CAN/LIN bus continuity and resistance; verify CAN high/low idle voltages (~2.5V differential behavior)

Signal parameters

  • CAN message ID assigned to seatbelt pretensioner module (manufacturer-specific)
  • Message frequency / alive counter (expected interval between frames)
  • Data length code (DLC) and expected payload structure for pretensioner messages
  • Checksum or CRC and sequence/rolling counter fields if used (validate integrity)
  • CAN high/low idle voltages (approx. 2.5 V nominal each; 3.5/1.5 V when dominant)
  • Module supply voltage (12 V nominal) and ground continuity

Diagnostic algorithm

  1. Use a factory-level or full-feature OBD scanner to read all U and SRS codes from all modules; note freeze-frame and occurrence history.
  2. Record any other communication or SRS codes. If multiple modules report network faults, suspect CAN bus level problem first.
  3. Visually inspect the seatbelt pretensioner harness and connector for damage, corrosion, water intrusion or poor seating.
  4. With manufacturer-recommended SRS safety precautions (disable battery as required), check connector pins for continuity and secure mating.
  5. Re-enable power and verify battery voltage and ground integrity at the module harness. Measure supply and ground with key on (following safety guidance).
  6. Check CAN bus voltages at the module connector with ignition on: confirm typical idle voltages and that no short to battery/chassis exists.
  7. If available, monitor CAN traffic or use an oscilloscope to confirm the pretensioner module transmits expected messages (ID, frequency) and that frames are valid. Look for error frames or corrupted data.
  8. If wiring and bus look correct, measure pretensioner squib resistance only per service manual procedures (some tests are restricted to avoid deploying devices). Do not connect a generic ohmmeter where prohibited; follow manufacturer instructions.
  9. If module fails communication or reports invalid data while wiring/bus are OK, consider reflashing/reprogramming module software per Hyundai service procedure or replace module with correct part number and software.
  10. After repair, clear codes and perform SRS self-test / system initialization as specified by the manufacturer. Confirm no reappearance of U047F and that SRS lamp is extinguished.
  11. If problem persists, escalate to manufacturer technical service with captured bus logs and complete diagnostic data.

Likely causes

  • Connector corrosion or bent terminals at seatbelt pretensioner module
  • Broken or chafed CAN high/low wires between pretensioner and SRS control module
  • Faulty pretensioner module internal circuitry or firmware
  • Fault coming from another module flooding the bus with invalid frames
  • Weak battery or poor ground causing data corruption

Fault status

⚠️ Status
Invalid data or corrupted communication received from Seatbelt Pretensioner Module 'A'. SRS system flagged data integrity/communication fault — inspect pretensioner module, wiring, power/ground, and CAN bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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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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