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Home / DTC / U0480 — Invalid Data Received From Seatbelt Pretensioner Module “B”

U0480 — Invalid Data Received From Seatbelt Pretensioner Module “B”

Detailed page for trouble code U0480.

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Code

U0480

HYUNDAI U — Network/User

Invalid Data Received From Seatbelt Pretensioner Module “B”

Brand: HYUNDAI
Type: U — Network/User
AI status
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Page language: EN

Causes

  • Faulty Seatbelt Pretensioner Module 'B' (internal failure)
  • Corroded, loose, damaged, or disconnected connector at the pretensioner module
  • Open/short in wiring between module and SRS/CAN bus
  • CAN bus faults (short to ground/voltage, high bus error rate, missing termination)
  • Low or unstable battery/charging system voltage during communication
  • Software/version mismatch, corrupted module software or calibration

Symptoms

  • SRS / airbag warning lamp illuminated
  • Seatbelt warning lamp or chime may be active
  • Possible disablement of seatbelt pretensioner deployment (reduced SRS functionality)
  • Stored U0480 and possibly related U-codes in diagnostic tool
  • Intermittent or permanent loss of communication with pretensioner module

What to check

  • Read all stored and pending DTCs (SRS and network) with a capable scan tool; capture freeze-frame data
  • Check vehicle battery voltage and charging system (battery at rest and cranking voltage)
  • Visually inspect pretensioner module, harness, and connector for corrosion, pin damage, or water intrusion
  • Check for additional network codes (other U-codes, CAN bus errors)
  • Perform wiggle test on wiring harness with key on (monitor network for changes)
  • Confirm whether the module is listed on the same CAN bus as other SRS components and check bus termination

Signal parameters

  • CAN message ID(s) assigned to Seatbelt Pretensioner Module B (refer to manufacturer data)
  • Message frequency (typically periodic status at few Hz) and DLC (data length) expected
  • Status byte(s): module alive/diagnostic/state flags, pretensioner armed/disarmed bits
  • Checksum or CRC field if used by module protocol
  • Bus voltages: nominal 11–14 V supply to module; CAN_H/CAN_L differential waveform ~2.5 V idle, differential ~1–2 V during data
  • No excessive error frames or bus arbitration losses during normal operation

Diagnostic algorithm

  1. Use a manufacturer-capable scan tool to read all SRS and network codes; record module addresses and freeze-frame data.
  2. Note related codes (other U-codes, B/C/P codes) and attempt to clear codes. Re-scan to see if U0480 returns immediately or after driving.
  3. Check battery resting and operating voltage. Recharge or stabilize battery if low; retest.
  4. Visually inspect pretensioner module connector and harness for corrosion, bent pins, moisture, chafing, or repair evidence. Repair damaged wiring/connector as required.
  5. With manufacturer's safety procedure followed (disable SRS power if required), disconnect and reconnect the module connector to reseat terminals; then re-enable and retest.
  6. If intermittent, perform wiggle test while monitoring the CAN bus and module status with a scan tool or CAN bus analyzer. Look for changes in signal or additional errors.
  7. Measure CAN_H/CAN_L with oscilloscope or lab scope to confirm proper differential waveform, no excessive noise, and correct termination. Check for short to battery/ground on bus wires.
  8. If wiring and bus integrity are confirmed, check module software/calibration level and compare to manufacturer service information; update programming or calibrate if applicable.
  9. If module fails bench or communication tests, replace the seatbelt pretensioner module B with an OEM part and program/configure per manufacturer procedures.
  10. After repair or replacement, clear codes and perform SRS system self-test and any prescribed relearn or initialization procedures. Confirm no recurrence of U0480.

Likely causes

  • Damaged connector or wiring to the pretensioner module (common)
  • CAN bus wiring fault or missing termination resistor
  • Module internal failure or firmware corruption
  • Low vehicle battery voltage or charging irregularity during communication

Fault status

⚠️ Status
Invalid Data Received From Seatbelt Pretensioner Module "B"
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0401 U0402 U0415 U0416 U0121
371

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