What is an OBD2 code?

An OBD2 (On-Board Diagnostics) code is a diagnostic trouble code (DTC) generated by your vehicle's computer system when it detects a problem. These codes help identify specific issues with your vehicle's engine, transmission, emissions, or other systems.

How do I read OBD2 codes?

To read OBD2 codes, you'll need an OBD2 scanner. Plug it into your vehicle's OBD2 port (usually located under the dashboard), turn your key to the 'ON' position, and follow your scanner's instructions to retrieve the codes. Each code starts with a letter (P, B, C, or U) followed by four numbers.

What do the different types of OBD2 codes mean?

OBD2 codes are categorized by their first letter: P (Powertrain) for engine and transmission issues, B (Body) for interior systems like airbags, C (Chassis) for mechanical systems like brakes, and U (Network) for computer and module communication problems.

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Home » OBD2 Codes » B0084

Code B0084

Symptoms

• Airbag warning light is on

• Airbag may not deploy in an accident

• Error message on dashboard

Common Causes

• Faulty airbag sensor

• Damaged wiring or connectors

• Defective airbag control module

Glossary

Airbag: A safety device in vehicles that inflates rapidly during a collision.

Sensor: A device that detects or measures a physical property and records, indicates, or otherwise responds to it.

Related Codes

• B0081

• B0083

Laymans terms

This code means there is a problem with the car's airbag system. It's like when a toy stops working because a part inside is broken.

Explanation

B0084 indicates an issue with the vehicle's airbag system, specifically relating to a sensor or circuit malfunction.

Technical description

The B0084 code is triggered when the airbag control module detects a fault in the passenger airbag sensor or circuit. This could be due to a short circuit, open circuit, or sensor failure.

Diagnosis steps

• Check for other related codes

• Inspect wiring and connectors for damage

• Test the airbag sensor with a multimeter

Repair procedures

• Replace faulty airbag sensor

• Repair or replace damaged wiring

• Replace airbag control module if necessary

Tools required

• OBD-II scanner

• Multimeter

• Screwdriver set

Estimated repair cost

$150 - $600

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Silverado

• GMC Sierra

• Cadillac Escalade

Preventive measures

• Regularly inspect airbag system components

• Avoid splicing into airbag wiring

• Ensure proper installation of aftermarket accessories

Error code type

Safety System Issue

User experience recommendations

• Do not ignore the airbag warning light

• Consult a professional mechanic for diagnosis

• Avoid DIY repairs unless you have experience

Warranty information

Airbag systems are often covered under extended warranties due to safety regulations.

Historical data

B0084 has been associated with various vehicle recalls in the past due to defective airbag sensors.

Urgency level

High – Airbag system issues should be addressed immediately to ensure passenger safety.

Legal and safety notice

Driving with a faulty airbag system can compromise safety and may violate vehicle safety regulations.

Testing conditions

• Vehicle ignition on

• Airbag system self-test initiated

Component location

The airbag sensor is typically located in the front passenger side of the vehicle, near the dashboard or seat.

FAQs

Q: Can I drive my car with the B0084 code?
A: It's not recommended to drive with a faulty airbag system as it may not deploy in an accident.

Q: How do I reset the airbag warning light?
A: The warning light can be reset with an OBD-II scanner after the issue is fixed.

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

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