B0047 – Left Front Side Impact Sensor Circuit Low
DTC B0047 indicates that the Airbag Control Module (ACM) has detected a low voltage condition in the left front side impact sensor circuit. The sensor provides collision data to the Supplemental Restraint System (SRS) module to help determine airbag deployment decisions.
A low circuit condition means the signal voltage from the sensor is below the expected operating range.
Code Information
- DTC: B0047
- System: Supplemental Restraint System (SRS)
- Description: Left Front Side Impact Sensor Circuit Low
- Severity: High (Safety Related)
Symptoms
- Airbag warning light ON.
- SRS warning message displayed.
- Side airbag operation may be affected.
- B0047 stored in the SRS control module.
Possible Causes
- Short circuit to ground in sensor wiring.
- Damaged left front impact sensor.
- Corroded or wet connector.
- Low reference or signal voltage.
- Damaged wiring harness.
- Airbag Control Module fault (rare).
Typical Wiring Diagram
Diagnostic Procedure
- Confirm DTC B0047 using an SRS scan tool.
- Inspect the left front impact sensor connector.
- Check wiring for shorts, corrosion, or damage.
- Verify signal and reference voltage according to manufacturer specifications.
- Repair damaged wiring or connectors.
- Replace the sensor if it fails testing.
- Clear the code and verify repair.
Important Note
Wire colors, connector pin numbers, sensor location, and electrical specifications vary between vehicle makes and models. Always refer to factory service information before testing SRS circuits.
Can You Drive With B0047?
The vehicle may drive normally, but the airbag system may not operate correctly during a collision. Repair this safety-related fault as soon as possible.
Estimated Repair Cost
- Connector repair: $20–80
- Wiring repair: $40–150
- Impact sensor replacement: $80–300
- SRS module repair/replacement: $300–900
Related DTCs
Frequently Asked Questions
What does B0047 mean?
It means the SRS module detected a low voltage condition in the left front side impact sensor circuit.
Can wiring cause B0047?
Yes. A short to ground or damaged wiring can cause this code.
Will replacing the sensor fix B0047?
Only if the sensor is the cause. The wiring and connectors must be checked first.
OBDSpark Technician Tip: Never test airbag circuits with a test light or apply external voltage. Follow proper SRS safety procedures before repairs.