Rear Left Seat Belt Pretensioner Circuit
2018-2018 Cadillac XT5 3.6L V6
The 2018 Cadillac XT5 is equipped with a 3.6L V6 engine. Below you'll find detailed b0056 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Malfunction in the rear left seat belt pretensioner deployment circuit.
Symptoms
- Airbag/seatbelt warning light on
- SRS code stored
- Rear left pretensioner inoperative
Common Causes
- Faulty pretensioner
- Wiring damage under rear seat
- Connector issue
- Water damage from rear window leak
Diagnostic Steps
- Scan SRS codes
- Inspect rear left pretensioner connector
- Check wiring under rear seat
- Look for moisture damage
Repair Notes
Replace pretensioner or repair wiring. Check for water intrusion.
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
B0056 on Other Vehicles
Common Questions
What does code B0056 mean on a 2018-2018 Cadillac XT5?
B0056 stands for "Rear Left Seat Belt Pretensioner Circuit". Malfunction in the rear left seat belt pretensioner deployment circuit.
What are the symptoms of B0056 on a Cadillac XT5?
Common symptoms of B0056 include: Airbag/seatbelt warning light on, SRS code stored, Rear left pretensioner inoperative.
What causes B0056 on a 2018-2018 Cadillac XT5?
Common causes of B0056 include: Faulty pretensioner, Wiring damage under rear seat, Connector issue, Water damage from rear window leak.
Last updated: March 2026