Rear Impact Sensor Circuit
2015-2015 Cadillac ATS 2.5L I4
The 2015 Cadillac ATS is equipped with a 2.5L inline-4 engine. Below you'll find detailed b0043 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
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 2015-2015 Cadillac ATS?
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 Cadillac ATS?
Common symptoms of B0043 include: Airbag warning light on, SRS fault stored, Rear collision protection degraded.
What causes B0043 on a 2015-2015 Cadillac ATS?
Common causes of B0043 include: Faulty rear impact sensor, Wiring damage from rear collision, Trunk area moisture intrusion, Sensor mounting loose.
Last updated: March 2026