Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the airbag system in the back of the car. It's like when a toy doesn't work right because a wire is loose.
The code indicates an issue with the airbag deployment control for the third row left frontal airbag, specifically the second stage of deployment.
The B0042 code is triggered when the airbag control module detects a fault in the circuit responsible for deploying the second stage of the third row left frontal airbag. This could be due to a wiring issue, a faulty airbag module, or a problem with the control unit.
• Airbag warning light on
• Airbag system not functioning properly
• Potential error message on dashboard
• Faulty airbag module
• Damaged wiring or connectors
• Malfunctioning airbag control unit
Airbag Module: A device that controls the deployment of airbags in a vehicle.
OBD-II Scanner: A tool used to read and clear diagnostic trouble codes from a vehicle's computer.
• Check for any visible damage to wiring and connectors.
• Use a diagnostic scanner to read airbag system codes.
• Inspect the airbag module and control unit for faults.
• Repair or replace damaged wiring or connectors.
• Replace faulty airbag module.
• Reset the airbag control unit and clear codes.
• OBD-II scanner
• Multimeter
• Wiring repair kit
$200 - $600
Moderate
• Chevrolet Suburban
• GMC Yukon XL
• Cadillac Escalade ESV
• Regularly inspect airbag system components.
• Ensure all recalls and service bulletins are addressed.
• Avoid tampering with airbag system wiring.
Safety System Issue
• Do not ignore the airbag warning light.
• Have the vehicle inspected by a professional as soon as possible.
Airbag systems are often covered under extended warranties due to safety regulations. Check with your manufacturer.
This code has been associated with wiring issues in vehicles with third-row seating, particularly in larger SUVs.
High – Airbag system issues can compromise passenger safety.
Driving with a faulty airbag system can increase the risk of injury in a collision. It is important to address airbag issues promptly.
• Vehicle ignition on
• Diagnostic scanner connected
The third row left frontal airbag is located in the left side of the vehicle's third-row seating area.
Q: Can I drive my car with this code?
A: It's not recommended to drive with an airbag system fault as it may not deploy in an accident.
Q: Will resetting the code fix the problem?
A: Resetting the code without fixing the underlying issue will not solve the problem. The code will likely return.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Body and airbag faults often need a scanner that can access more than generic powertrain codes.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking power, ground, and continuity in body-system circuits.
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Universal · Fuse kit
Useful for electrical diagnosis when blown fuses or circuit faults are part of the troubleshooting process.
Useful when body electrical faults trace back to blown fuses or shared circuits.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.