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Home / DTC / U047F — Invalid Data Received From Seat Belt Pretensioner Module A

U047F — Invalid Data Received From Seat Belt Pretensioner Module A

Detailed page for trouble code U047F.

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Code

U047F

Generic U — Network/User

Invalid Data Received From Seat Belt Pretensioner Module A

Brand: Generic
Type: U — Network/User
Views: UK: 17 EN: 30 RU: 13
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Page language: EN

Causes

  • Faulty seat belt pretensioner module A (hardware or firmware)
  • Damaged, pinched, corroded, or loose wiring or connector at the pretensioner module
  • Poor or intermittent CAN/LIN bus communication (terminations, shorts, opens, or noise)
  • Low or unstable battery/system voltage during message transmission
  • Corrupted module software or mismatched calibration/ID after replacement
  • Electrical interference from aftermarket electronics

Symptoms

  • SRS/airbag warning lamp illuminated on instrument panel
  • Seat belt pretensioner indicator or SRS system reports fault or disabled state
  • Stored diagnostic trouble code U047F (and possibly other SRS or network U-codes)
  • Vehicle may refuse to arm airbag/pretensioner circuits until fault cleared
  • Inconsistent module data when viewed with a scan tool (missing or malformed fields)

What to check

  • Read all stored DTCs and freeze-frame data from SRS and network modules; record related U and B codes
  • Check vehicle battery voltage (battery and charging system) and ensure stable supply (>12V) while testing
  • Visually inspect pretensioner module connector and wiring for damage, corrosion, bent terminals, or aftermarket taps
  • Verify connectors are fully seated and locking tabs engaged; inspect ground connection quality
  • Use scan tool to view live data from pretensioner module A: module ID, status/alive message, error counters, and message frequency
  • Scan for other module communication faults (U-codes) that may indicate bus-wide problems

Signal parameters

  • Periodic 'alive'/status message from pretensioner module A — expected to be present at regular intervals (typically tens to several hundred ms; consult OEM docs)
  • Message should contain module ID, status bits (OK/FAULT/DEPLOYED), and a checksum/CRC field — verify checksum validity
  • CAN bus: proper message ID for pretensioner module A and expected message frequency; absence or malformed frames indicates issue
  • Bus physical layer: CAN_H/CAN_L idle voltages and 60Ω termination across the bus should be within manufacturer tolerance
  • LIN (if used): expected frame timing and checksum validation for LIN-connected pretensioner devices

Diagnostic algorithm

  1. Retrieve all SRS and network DTCs with a capable scan tool; note which modules report communication or invalid data.
  2. Verify battery voltage and charging system; charge or replace battery if voltage is low or unstable during testing.
  3. Perform visual inspection of pretensioner module A connector and harness. Repair any damaged wiring, pins, or corrosion.
  4. With scan tool connected, monitor the pretensioner module alive/status messages and watch for frequency, missing frames, or checksum errors.
  5. Wiggle harness and connectors while watching live data to detect intermittent faults. Repair or secure harness as required.
  6. Check CAN/LIN network health: measure bus voltages, verify termination, and look for shorts to power/ground or high resistance connections.
  7. Clear codes and attempt to reproduce. If code returns immediately, capture bus data (message frames) for analysis.
  8. If wiring and bus are good, verify module programming/part number and reflash or update software if available from manufacturer.
  9. If symptoms persist after wiring and software verification, replace pretensioner module A with a known-good unit and re-test. Follow SRS safing and replacement procedures.
  10. After repairs, clear codes and perform SRS system self-tests and any required post-repair relearn or initialization procedures per OEM instructions.

Likely causes

  • Connector/wiring problem at pretensioner module (insulation damage, bent pins, corrosion)
  • Intermittent CAN communication or missing/incorrect module ID on bus
  • Failed pretensioner module or internal memory corruption
  • Low vehicle battery voltage or poor ground affecting module transmissions

Fault status

⚠️ Status
Invalid data received from Seat Belt Pretensioner Module A: the restraint control module detected corrupted or unexpected messages from the pretensioner module. SRS readiness or deployment may be affected until the communication fault is resolved.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0140 U0155 U0415 U0424
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