B0043
Rear Impact Sensor Circuit
2019-2024 BMW 3 Series G20 2.0L I4 Turbo B48
Critical SeverityBodyGeneric (SAE)
Description
Malfunction in the rear impact sensor circuit. This sensor detects rear-end collision severity for fuel shutoff and restraint deployment.
Symptoms
- Airbag warning light on
- SRS fault stored
- Rear collision protection degraded
Common Causes
- Faulty rear impact sensor
- Wiring damage from rear collision
- Trunk area moisture intrusion
- Sensor mounting loose
Diagnostic Steps
- Scan SRS codes
- Inspect rear impact sensor in trunk or rear panel area
- Check wiring
- Measure circuit resistance
Repair Notes
Replace rear impact sensor or repair wiring. Check for moisture intrusion in trunk area.
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
B0043 on Other Vehicles
Common Questions
What does code B0043 mean on a 2019-2024 BMW 3 Series G20?
B0043 stands for "Rear Impact Sensor Circuit". Malfunction in the rear impact sensor circuit. This sensor detects rear-end collision severity for fuel shutoff and restraint deployment.
What are the symptoms of B0043 on a BMW 3 Series G20?
Common symptoms of B0043 include: Airbag warning light on, SRS fault stored, Rear collision protection degraded.
What causes B0043 on a 2019-2024 BMW 3 Series G20?
Common causes of B0043 include: Faulty rear impact sensor, Wiring damage from rear collision, Trunk area moisture intrusion, Sensor mounting loose.