B0039
Front Impact Severity Sensor Circuit
2019-2024 BMW 3 Series G20 2.0L I4 Turbo B48
Critical SeverityBodyGeneric (SAE)
Description
Malfunction in the frontal impact severity sensor used to determine airbag deployment force level.
Symptoms
- Airbag warning light on
- SRS fault stored
- Dual-stage airbag staging may be incorrect
Common Causes
- Faulty severity sensor
- Wiring damage
- Control module fault
- Sensor mounting compromised
Diagnostic Steps
- Scan SRS codes
- Inspect severity sensor
- Check wiring to ACM
- Measure sensor circuit
- Verify sensor mounting
Repair Notes
Replace impact severity sensor. Ensure correct deployment staging by verifying ACM calibration.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0007Rear Left Side Airbag Deployment Circuit
- B0008Rear Right Side Airbag Deployment Circuit
- B0009Rear Center Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
B0039 on Other Vehicles
Common Questions
What does code B0039 mean on a 2019-2024 BMW 3 Series G20?
B0039 stands for "Front Impact Severity Sensor Circuit". Malfunction in the frontal impact severity sensor used to determine airbag deployment force level.
What are the symptoms of B0039 on a BMW 3 Series G20?
Common symptoms of B0039 include: Airbag warning light on, SRS fault stored, Dual-stage airbag staging may be incorrect.
What causes B0039 on a 2019-2024 BMW 3 Series G20?
Common causes of B0039 include: Faulty severity sensor, Wiring damage, Control module fault, Sensor mounting compromised.