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 » B0090

Code B0090

Symptoms

• Airbag warning light on

• Airbag system not functioning

• No deployment of airbags in a crash

Common Causes

• Faulty airbag sensor

• Damaged wiring or connectors

• Defective airbag control module

Glossary

Airbag: A safety device in vehicles designed to inflate rapidly in the event of a collision.

Sensor: A device that detects and responds to input from the physical environment.

Related Codes

• B0089

• B0091

Laymans terms

This code means there is a problem with one of the car's airbags. It might not work properly if you get into an accident.

Explanation

The B0090 code indicates an issue with the airbag system, specifically related to a sensor or circuit malfunction.

Technical description

B0090 is a diagnostic trouble code (DTC) for a fault in the airbag system, often related to a sensor or wiring issue that affects the deployment of the airbag.

Diagnosis steps

• Scan the vehicle for codes and freeze frame data.

• Inspect the airbag sensor and related wiring for damage.

• Test the airbag control module for faults.

Repair procedures

• Replace the faulty airbag sensor.

• Repair or replace damaged wiring or connectors.

• Replace the airbag control module if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Screwdriver set

Estimated repair cost

$200 - $600

Difficulty level

Moderate

Commonly affected vehicles

• Toyota Camry

• Honda Accord

• Ford Escape

Preventive measures

• Regularly inspect airbag system components.

• Avoid moisture exposure to the airbag sensors.

• Ensure proper vehicle maintenance.

Error code type

Safety System Issue

User experience recommendations

• Do not ignore the airbag warning light.

• Have the vehicle inspected by a professional as soon as possible.

Warranty information

Check with the vehicle manufacturer for any airbag system recalls or extended warranties.

Historical data

Airbag system issues have been a focus of automotive safety improvements over the years.

Urgency level

High – Airbags are critical for safety in the event of a collision.

Legal and safety notice

Driving with a malfunctioning airbag system can be dangerous and may not comply with safety regulations.

Testing conditions

• Vehicle ignition on

• Airbag system diagnostic mode

Component location

The airbag sensor is typically located in the front of the vehicle, near the bumper or within the steering wheel.

FAQs

Q: Can I drive with a B0090 code?
A: It's not recommended, as the airbag system may not work properly in an accident.

Q: How do I reset the airbag light?
A: The airbag light can be reset by fixing the underlying issue and then using a diagnostic scanner to clear the code.

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

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