What Does U047C Mean?
The airbag control module is receiving corrupted or implausible data from restraint sensor L (typically a crash sensor, occupant sensor, or side impact sensor). This network communication error prevents proper airbag system operation and will illuminate the airbag warning light.
Safety Warning
Airbags may not deploy properly in a collision. Vehicle should not be driven until repaired as occupant safety is compromised.
Common Causes
35%
Corroded or damaged wiring/connector at sensor L location
30%
Failed or internally faulty restraint sensor L
20%
Water intrusion or moisture in sensor connector
10%
CAN bus network interference or short circuit affecting sensor signal
5%
Faulty airbag control module misinterpreting valid sensor data
Diagnostic Steps
1
Step 1: Use scan tool to monitor live data from restraint sensor L and verify data quality/signal presence
2
Step 2: Locate sensor L per manufacturer wiring diagram and visually inspect connector for corrosion, moisture, or damage
3
Step 3: Perform continuity and resistance tests on wiring harness between sensor L and airbag control module
4
Step 4: Check sensor power and ground circuits with multimeter; verify proper voltage supply
5
Step 5: If wiring and power are good, replace restraint sensor L and retest system operation
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The airbag control module is receiving corrupted or implausible data from restraint sensor L (typically a crash sensor, occupant sensor, or side impact sensor). This network communication error prevents proper airbag system operation and will illuminate the airbag warning light.
The most common cause of U047C (Invalid Data Received From "Restraints System Sensor L") is: Corroded or damaged wiring/connector at sensor L location
Typical repair costs for U047C range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Airbags may not deploy properly in a collision. Vehicle should not be driven until repaired as occupant safety is compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U047C to identify the root cause.
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Quick Info
Category
Network
System
Supplemental Restraint System (SRS/Airbag)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
