B0043critical severityBody
Rear Impact Sensor Circuit
on 2021 BMW i3 42 kWh Single Motor RWD · RWD
What this code means
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.
Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0006
Passenger Knee Airbag Deployment Circuit
B0007
Rear Left Side Airbag Deployment Circuit
B0008
Rear Right Side Airbag Deployment Circuit
B0009
Rear Center Airbag Deployment Circuit
B0010
Driver Side Airbag Deployment