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 seat belt in the back row on the right side of the car. The special part that makes the seat belt tighten quickly in a crash isn't working right.
The code B0078 indicates a malfunction in the deployment control of the seat belt pretensioner located in the third row on the right side. This system is crucial for tightening the seat belt during a collision.
The B0078 code is triggered when the airbag control module detects an issue with the electrical circuit or the mechanical operation of the third row right seat belt pretensioner. This component is responsible for retracting the seat belt to remove slack in the event of a crash, enhancing passenger safety.
• Airbag warning light on
• Seat belt not retracting properly
• Error message on the dashboard
• Faulty seat belt pretensioner
• Damaged wiring or connectors
• Malfunctioning airbag control module
Pretensioner: A device that tightens the seat belt in the event of a crash.
Airbag Control Module: The computer that controls the airbag system in a vehicle.
• Perform a visual inspection of the seat belt and connectors.
• Use a diagnostic scanner to read the airbag module codes.
• Check the wiring and connectors for damage or corrosion.
• Replace the faulty seat belt pretensioner.
• Repair or replace damaged wiring or connectors.
• Reset the airbag control module.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $500
Moderate
• Chevrolet Suburban
• GMC Yukon XL
• Cadillac Escalade ESV
• Regularly inspect seat belts for wear and tear.
• Ensure the airbag system is serviced as per the manufacturer's schedule.
• Avoid spills and moisture in the vehicle interior that could affect electrical components.
Safety System Issue
• Do not ignore the airbag warning light.
• Have a professional inspect the seat belt system as soon as possible.
Check with your vehicle manufacturer; safety systems may have extended warranties.
The B0078 code has been associated with seat belt pretensioner issues in larger SUVs and vehicles with third-row seating.
High – This issue affects the vehicle's safety systems and should be addressed promptly.
Driving with a malfunctioning seat belt system can be dangerous and may violate vehicle safety regulations.
• Vehicle stationary
• Ignition in the 'On' position
The third row right seat belt pretensioner is located in the rear passenger compartment, typically near the seat belt retractor.
Q: Can I drive with the B0078 code?
A: It's not recommended to drive with this code active, as it indicates a problem with your vehicle's safety system.
Q: How can I reset the airbag warning light?
A: The airbag warning light can be reset using an OBD-II scanner after the underlying issue is resolved.
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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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.
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