Invalid Data from Restraint Sensor N
The U047E code indicates that the airbag control module (SDM) has received invalid, corrupt, or out-of-range data from a specific restraint system sensor, designated as Sensor N. This sensor could be an impact sensor, occupant presence sensor, or airbag deployment sensor. The fault occurs when the data message on the communication bus (CAN, LIN, or proprietary protocol) fails checksum validation, contains logical out-of-limit values, or appears frozen. This is a high-severity issue that may disable the airbag system.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Faulty restraint sensor N (internal damage or degradation)
- Electromagnetic interference in the sensor wiring
- Abnormal resistance in communication bus connectors or terminals
- Corrosion or damage to the sensor wiring harness
- Faulty airbag control module (SDM) misinterpreting data
- Shared ground issue affecting data signal integrity
- Outdated or corrupted control module software
3. Symptoms You Will Notice
- Airbag warning light illuminated
- Supplemental Restraint System (SRS) fault message on dashboard
- Possible airbag system deactivation
4. Step-by-Step Diagnosis
Scan for all stored codes and freeze frame data
Inspect wiring and connectors for Sensor N for corrosion, damage, or loose connections
Check communication bus (CAN/LIN) for proper resistance and signal integrity
Test Sensor N per manufacturer specifications (resistance, voltage, or output)
Verify ground connections for the SRS system
Update or reprogram the airbag control module if software is outdated
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. The airbag system may be disabled, increasing injury risk in a collision. Have the vehicle towed to a repair facility.
How much does it cost to fix?▼
Repair costs typically range from $200 to $1,200, depending on whether the sensor, wiring, or control module needs replacement, plus diagnostic fees.