What does the B0043 fault code mean?
The B0043 fault code, applicable to all car manufacturers, means “Third Row Left Frontal Stage 3 Deployment Control (Subfault)“.
Background Information: Newer vehicles use multi-stage airbags to regulate the pressure inside the airbag. The higher the pressure, the greater the intensity of the airbag deployment. The system automatically determines the airbag deployment intensity based on parameters such as collision intensity, passenger weight, seat belt usage, child seat presence, and distance from the airbag. This design ensures that the airbag deploys at medium intensity in most collisions, reserving maximum intensity for the most severe collisions.
Symptoms of the B0043 fault code:
- The SRS (airbag) light on the dashboard illuminates.
- The driver’s airbag may be disconnected.
- Errors in safety diagnostics.
Main causes of the B0043 fault code:
- Damaged or worn wiring in the airbag circuit.
- SRS control module malfunction.
- Problems with connections or connectors in the circuit.
- Compromised integrity of the steering wheel spiral cable.
B0043 fault code in different vehicles:
B0043 in Chevrolet Silverado: In Chevrolet Silverado models, code B0043 is usually related to a problem with the steering wheel spiral cable, which can cause the driver’s airbag to malfunction.
B0043 in GMC Sierra: In GMC Sierra models, this fault code may indicate an SRS control module malfunction or damaged steering column wiring.
Chevrolet Trailblazer B0043: In the Chevrolet Trailblazer, code B0043 may be caused by airbag circuit connection problems or coil failure.
B0043 in Cadillac Escalade: In the Cadillac Escalade, this code is usually related to wear or damage to the coil cable, which affects the operation of the driver’s airbag.
B0043 in Saab 9-5: In the Saab 9-5, code B0043 may indicate an airbag circuit voltage problem, possibly due to wiring or connection faults.
How to diagnose the B0043 fault code?
- Connect an OBD2 diagnostic scanner to the vehicle and read the error codes. Check the wiring and connections in the driver’s airbag circuit for damage or corrosion.
- Test the integrity of the spiral cable in the steering wheel.
- Check the SRS system control module for malfunctions.
- Once the problem is resolved, use a scanner to reset the error code and check if it reappears.
Possible Causes and Diagnostic Methods
| Possible Cause | How to Check？ |
|---|---|
| Damaged wiring | Visual inspection for wear or breakage |
| Faulty SRS module | Diagnosis with a dedicated scanner |
| Connection or connector problems | Check for corrosion or loose contacts |
| Broken spiral cable | Perform a cable continuity test with a multimeter |
Tools needed: OBD2 scanner, multimeter, power tool kit, automotive electrical system diagram
How to fix error code B0043?
Simple Repair Methods
- Clean and reconnect the connectors in the airbag circuit.
- Reset the error code after checking the system.
In-depth Diagnostic and Repair Solutions
- Replace damaged wires or connectors.
- Repair or replace the spiral cable on the steering wheel.
- Replace the faulty SRS system control module.
Troubleshooting by Symptoms
| Symptom | Possible Solution |
|---|---|
| SRS indicator light illuminated on the dashboard | Check and repair wiring, reset error code |
| Safety diagnostic error | Replace the faulty SRS module or spiral cable |
B0043 Error FAQ
Is it possible to drive with error B0043?
It is not recommended, as the airbag system may not deploy in an accident, increasing the risk of injury.
Can error B0043 appear due to battery disconnection?
Yes, errors, including B0043, can occur in the SRS system when the battery is disconnected, but they usually disappear after resetting.
How can I reset error B0043 without a scanner?
You can try disconnecting the battery for 10-15 minutes, but if the fault is not resolved, the error will reappear.
Is error B0043 dangerous?
Yes, it indicates a malfunction in the airbag system, which could lead to airbag failure in an accident.
Can I fix error B0043 myself?
Yes, if you have experience with automotive electrical equipment, but caution and safety measures are required when working with the SRS system.
Error B0043 related OBD2 errors:
B0013 – Passenger Knee Bolster Deployment Control (Subfault)
B0026 – Driver airbag deployment circuit, stage 1: Circuit malfunction
B0044 – Driver airbag deployment circuit, stage 2: Circuit malfunction
Important! Ignoring this specification may lead to airbag failure and increase the risk of injury in an accident. A thorough diagnosis is recommended to eliminate any detected faults and ensure safety.