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 » B0028

Code B0028

Symptoms

• Airbag warning light illuminated

• Airbag may not deploy in a crash

• Error message on dashboard

Common Causes

• Faulty airbag module

• Damaged wiring or connectors

• Malfunctioning airbag sensor

Glossary

Airbag Module: A device that controls the deployment of airbags.

OBD-II Scanner: A tool used to read and clear diagnostic trouble codes from a vehicle's computer.

Related Codes

• B0029

• B0030

Laymans terms

This code means there's a problem with the airbag system in your car. It's like when a safety feature isn't working right, and it needs to be fixed to keep you safe.

Explanation

The B0028 code indicates an issue with the airbag system, specifically related to the passenger side airbag deployment circuit.

Technical description

B0028 is a diagnostic trouble code (DTC) for a malfunction in the passenger side airbag deployment circuit. This could involve a fault in the wiring, connectors, or the airbag module itself.

Diagnosis steps

• Check for any other related codes.

• Inspect wiring and connectors for damage.

• Test the airbag module and sensor functionality.

Repair procedures

• Replace damaged wiring or connectors.

• Replace faulty airbag module.

• Reset the airbag system and clear the code.

Tools required

• OBD-II scanner

• Multimeter

• Basic hand tools

Estimated repair cost

$200 - $600

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Silverado

• GMC Sierra

• Cadillac Escalade

Preventive measures

• Regularly inspect airbag system components.

• Avoid tampering with airbag wiring.

• Have the airbag system checked during routine 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

Airbag systems may be covered under a longer warranty period due to safety regulations. Check with the manufacturer.

Historical data

Airbag system faults have been a common issue in vehicles, leading to recalls and increased safety checks.

Urgency level

High – Airbag issues are critical for occupant safety and should be addressed immediately.

Legal and safety notice

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

Testing conditions

• Vehicle must be stationary.

• Ensure the battery is fully charged.

Component location

The passenger airbag module is located in the dashboard on the passenger side.

FAQs

Q: Can I drive with the B0028 code?
A: It's not recommended to drive with this code active, as it indicates a problem with the airbag system.

Q: How do I reset the airbag light?
A: The airbag light can be reset using an OBD-II scanner after the issue has been fixed.

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

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