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Code B0085

Symptoms

• Airbag warning light on

• Seatbelt pretensioner not functioning

• Possible seatbelt slack during an accident

Common Causes

• Faulty seatbelt pretensioner

• Damaged wiring or connectors

• Defective control module

Glossary

Pretensioner: A device that tightens the seatbelt in a crash.

Control Module: A computer that manages vehicle systems, including safety features.

Related Codes

• B0084

• B0086

Laymans terms

This code means there's a problem with the seatbelt system in your car. It's like when your seatbelt isn't working right, and it might not keep you safe in an accident.

Explanation

The B0085 code indicates an issue with the seatbelt pretensioner circuit, which is part of the vehicle's safety system.

Technical description

The B0085 OBD-II code relates to a malfunction in the seatbelt pretensioner circuit. The pretensioner is a component that tightens the seatbelt in the event of a collision to help secure the occupant. This code is triggered when the control module detects an abnormality in the electrical circuit of the pretensioner.

Diagnosis steps

• Perform a visual inspection of the seatbelt and pretensioner.

• Check for damaged wiring or connectors.

• Use a scan tool to read the airbag module data.

Repair procedures

• Replace the faulty seatbelt pretensioner.

• Repair or replace damaged wiring or connectors.

• Reprogram or replace the control module if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Basic hand tools

Estimated repair cost

$150 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Malibu

• Ford F-150

• Toyota Camry

Preventive measures

• Regularly inspect seatbelt components.

• Avoid spilling liquids near seatbelt mechanisms.

• Have the airbag system checked periodically.

Error code type

Safety System Issue

User experience recommendations

• Do not ignore the airbag warning light.

• Have the vehicle inspected by a professional.

• Avoid driving until the issue is resolved if possible.

Warranty information

Check with your vehicle manufacturer as seatbelt systems may be covered under a safety warranty.

Historical data

The B0085 code has been associated with seatbelt pretensioner issues since the implementation of advanced airbag systems in vehicles.

Urgency level

High – This issue affects vehicle safety systems and should be addressed immediately.

Legal and safety notice

Driving with a malfunctioning seatbelt system may be illegal and unsafe. Ensure repairs are made promptly.

Testing conditions

• Vehicle stationary

• Ignition in the 'On' position

Component location

The seatbelt pretensioner is typically located at the base of the seatbelt assembly, near the seat anchor point.

FAQs

Q: What happens if I ignore the B0085 code?
A: Ignoring this code can compromise your safety in a crash, as the seatbelt may not function properly.

Q: Can I fix the B0085 code myself?
A: Unless you have experience with vehicle safety systems, it's best to have a professional handle this repair.

Last updated: Oct 28, 2025 • Source: internal database
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