U0474: Invalid Restraint Sensor D Data
Diagnostic trouble code U0474 indicates that a vehicle control module has received invalid or erroneous data from the Restraints System Sensor D. This is a network communication code (U-codes per SAE J2012) triggered when a receiving module detects data integrity inconsistencies from the restraint sensor, pointing to a communication failure or sensor data calculation error. The fault centers on the validity of passive safety information.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Internal failure of Restraints System Sensor D (airbag sensor)
- Communication bus wiring short circuit, open circuit, or high resistance
- Corroded or loose electrical connections in the sensor harness
- Faulty SRS/RCM (restraints control module)
- Electromagnetic interference (EMI) corrupting the data signal
3. Symptoms You Will Notice
- Airbag warning light illuminated
- Possible airbag system deactivation
- No symptoms may be noticeable
4. Step-by-Step Diagnosis
Scan for all stored codes and freeze frame data
Inspect wiring and connectors for damage, corrosion, or looseness
Test communication bus continuity and resistance
Check for technical service bulletins (TSBs) related to U0474
If wiring is OK, suspect sensor or module failure; perform component tests
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. This code indicates a fault in the airbag system, which may not deploy in a crash, increasing injury risk.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the sensor, wiring, or module needs replacement.