Code
U0473
Generic
U — Network/User
Invalid Data Received From Restraints System Sensor C
AI status
Completed
Completed
100%
Causes
- Faulty Restraints System Sensor C (internal failure)
- Damaged/open/shorted wiring or poor connector between sensor and restraints control module
- Corroded or loose connector terminals
- Loss of sensor supply or ground (low battery voltage or poor chassis ground)
- CAN/LIN network errors or bus faults (noise, high bit errors, termination issue)
- Faulty Restraints Control Module or other module sending/receiving the message
Symptoms
- SRS/airbag warning lamp ON
- Possible disablement of airbags or seatbelt pretensioners (system fault state)
- Logged U0473 stored/active (may be accompanied by other network or SRS codes)
- Chimes or occupant classification warnings in some vehicles
- Intermittent fault reappearing after clearing codes
What to check
- Read DTCs and freeze-frame data with a capable scan tool; note related codes and timestamps
- Verify battery voltage and charging system (low voltage can cause communication errors)
- Inspect sensor C connector and wiring for corrosion, damage, or loose pins
- Check for other modules reporting CAN errors or shorted nodes
- Use scan tool to view live data from restraints sensor C (if available) and check message rate/values
- Perform wiggle test on harness while monitoring live data to reproduce fault
Signal parameters
- Message: Restraints Sensor C CAN/LIN message (message ID varies by manufacturer)
- Data length: typically 8 bytes for CAN messages (varies)
- Expected update rate: typically 5–50 Hz for SRS sensor messages (manufacturer dependent)
- Signal types: status bytes, sensor status bits, occupant/classification or crash data (digital values)
- Sensor supply: typically 5 V or vehicle battery voltage depending on sensor design (verify on wiring diagram)
- CAN bus idle: differential ~2.5 V per CAN_H/CAN_L; look for clean square wave signals with an oscilloscope when active
Diagnostic algorithm
- Retrieve and record all DTCs and freeze-frame info. Note whether U0473 is current, pending or history.
- Verify battery voltage >= 12.2 V with engine off and charging system normal. Low voltage can corrupt data.
- Inspect physical condition of Restraints Sensor C connector and wiring harness (pin corrosion, loose retention, broken wires). Repair as needed.
- Using a scan tool, monitor the sensor C message rate and data. If message absent or values invalid, proceed to wiring/sensor checks.
- Check sensor power and ground circuits per wiring diagram. Measure supply voltage and ground continuity at the connector.
- If sensor uses discrete analog/digital lines, measure signal(s) while operating or simulating conditions. If CAN, use oscilloscope to verify proper CAN_H/CAN_L waveforms at the sensor connector and at the restraints module.
- Perform wiggle test on harness connectors and while monitoring live data to reproduce the fault. Repair any intermittent connections.
- If wiring and supply/ground are good, substitute a known-good sensor (if available) or bench-test the suspect sensor per manufacturer procedure.
- Check for software/calibration/module coding issues after module or sensor replacement; reprogram or code modules as required.
- After repairs, clear codes and perform self-tests and a road test or required system checks. Verify U0473 does not return and SRS lamp is off.
- Safety note: Follow manufacturer procedures for SRS system service. Disable SRS power and take required precautions before disconnecting sensors or working on airbag components.
Likely causes
- Corrosion or bent pins at the sensor connector
- Broken or chafed wires in seat/cowl area (common where wiring flexes)
- Sensor internal short or open (resistance out of spec)
- Loss of sensor 5V/12V supply or poor ground
- CAN bus dominant/recessive errors caused by missing termination or another module fault
- Recent module/sensor replacement not coded or with incompatible software
Fault status
Status
Invalid data or corrupted message received from Restraints System Sensor C on the vehicle data bus. The Restraints Control Module flagged the sensor message as out-of-range, malformed, or missing, typically illuminating the SRS warning lamp.
Repair difficulty: Hard
Diagnostic time: 1.0-4.0 hours
Similar codes
Repair manuals
Brands with available manuals
6,720
The library contains 6,720 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
U0473
HYUNDAI
U — Network/User
Invalid Data Received From “Restraints System Sensor C”
AI status
Completed
Completed
100%
Causes
- Faulty Restraints System Sensor C (internal failure)
- Damaged/open/shorted wiring or poor connector between sensor and restraints control module
- Corroded or loose connector terminals
- Loss of sensor supply or ground (low battery voltage or poor chassis ground)
- CAN/LIN network errors or bus faults (noise, high bit errors, termination issue)
- Faulty Restraints Control Module or other module sending/receiving the message
Symptoms
- SRS/airbag warning lamp ON
- Possible disablement of airbags or seatbelt pretensioners (system fault state)
- Logged U0473 stored/active (may be accompanied by other network or SRS codes)
- Chimes or occupant classification warnings in some vehicles
- Intermittent fault reappearing after clearing codes
What to check
- Read DTCs and freeze-frame data with a capable scan tool; note related codes and timestamps
- Verify battery voltage and charging system (low voltage can cause communication errors)
- Inspect sensor C connector and wiring for corrosion, damage, or loose pins
- Check for other modules reporting CAN errors or shorted nodes
- Use scan tool to view live data from restraints sensor C (if available) and check message rate/values
- Perform wiggle test on harness while monitoring live data to reproduce fault
Signal parameters
- Message: Restraints Sensor C CAN/LIN message (message ID varies by manufacturer)
- Data length: typically 8 bytes for CAN messages (varies)
- Expected update rate: typically 5–50 Hz for SRS sensor messages (manufacturer dependent)
- Signal types: status bytes, sensor status bits, occupant/classification or crash data (digital values)
- Sensor supply: typically 5 V or vehicle battery voltage depending on sensor design (verify on wiring diagram)
- CAN bus idle: differential ~2.5 V per CAN_H/CAN_L; look for clean square wave signals with an oscilloscope when active
Diagnostic algorithm
- Retrieve and record all DTCs and freeze-frame info. Note whether U0473 is current, pending or history.
- Verify battery voltage >= 12.2 V with engine off and charging system normal. Low voltage can corrupt data.
- Inspect physical condition of Restraints Sensor C connector and wiring harness (pin corrosion, loose retention, broken wires). Repair as needed.
- Using a scan tool, monitor the sensor C message rate and data. If message absent or values invalid, proceed to wiring/sensor checks.
- Check sensor power and ground circuits per wiring diagram. Measure supply voltage and ground continuity at the connector.
- If sensor uses discrete analog/digital lines, measure signal(s) while operating or simulating conditions. If CAN, use oscilloscope to verify proper CAN_H/CAN_L waveforms at the sensor connector and at the restraints module.
- Perform wiggle test on harness connectors and while monitoring live data to reproduce the fault. Repair any intermittent connections.
- If wiring and supply/ground are good, substitute a known-good sensor (if available) or bench-test the suspect sensor per manufacturer procedure.
- Check for software/calibration/module coding issues after module or sensor replacement; reprogram or code modules as required.
- After repairs, clear codes and perform self-tests and a road test or required system checks. Verify U0473 does not return and SRS lamp is off.
- Safety note: Follow manufacturer procedures for SRS system service. Disable SRS power and take required precautions before disconnecting sensors or working on airbag components.
Likely causes
- Corrosion or bent pins at the sensor connector
- Broken or chafed wires in seat/cowl area (common where wiring flexes)
- Sensor internal short or open (resistance out of spec)
- Loss of sensor 5V/12V supply or poor ground
- CAN bus dominant/recessive errors caused by missing termination or another module fault
- Recent module/sensor replacement not coded or with incompatible software
Fault status
Status
Invalid data or corrupted message received from Restraints System Sensor C on the vehicle data bus. The Restraints Control Module flagged the sensor message as out-of-range, malformed, or missing, typically illuminating the SRS warning lamp.
Repair difficulty: Hard
Diagnostic time: 1.0-4.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
371
Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HYUNDAI
-
HYUNDAI: 2023
-
Elantra
-
Elantra N
-
Kona N
-
Tucson
- Hybrid Blue
- Hybrid Limited
- Hybrid SEL Convenience
- Limited, Eng CD G4EN, 4WD
- Limited, Eng CD G4EN, FWD
- Limited, Eng CD G4KN, 4WD
- Limited, Eng CD G4KN, FWD
- N Line, Eng CD G4EN, 4WD
- N Line, Eng CD G4EN, FWD
- N Line, Eng CD G4KN, 4WD
- N Line, Eng CD G4KN, FWD
- Plug-In Hybrid Limited
- Plug-In Hybrid SEL
- SE, Eng CD G4EN, 4WD
- SE, Eng CD G4EN, FWD
- SE, Eng CD G4KN, 4WD
- SE, Eng CD G4KN, FWD
- SEL, Eng CD G4EN, 4WD
- SEL, Eng CD G4EN, FWD
- SEL, Eng CD G4KN, 4WD
- SEL, Eng CD G4KN, FWD
- XRT, Eng CD G4EN, 4WD
- XRT, Eng CD G4EN, FWD
- XRT, Eng CD G4KN, 4WD
- XRT, Eng CD G4KN, FWD
-
-
HYUNDAI: 2022
-
Elantra N
-
Kona N
-
Veloster N
-
HYUNDAI: 2021
-
Veloster N
-
HYUNDAI: 2020
-
Palisade
-
Veloster N
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email