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 » B0029

Code B0029

Symptoms

• Airbag warning light on

• Airbag system disabled

• Potential lack of airbag deployment in a crash

Common Causes

• Faulty airbag module

• Damaged wiring or connectors

• Defective airbag sensor

Glossary

Airbag: A safety device in vehicles designed to inflate rapidly during a collision.

Deployment Loop: The circuit responsible for deploying the airbag during a crash.

Related Codes

• B0028

• B0030

Laymans terms

This code means there is a problem with one of the airbags in the car. It's like when a balloon doesn't work right when you try to blow it up.

Explanation

The B0029 code indicates an issue with the airbag system, specifically related to a deployment loop.

Technical description

B0029 is a diagnostic trouble code (DTC) for a fault in the airbag deployment loop, often related to a specific airbag circuit or sensor malfunction. This code is typically associated with the driver's side frontal airbag.

Diagnosis steps

• Check the airbag warning light on the dashboard.

• Inspect airbag connectors and wiring for damage.

• Use a diagnostic scanner to read airbag system codes.

Repair procedures

• Replace the faulty airbag module.

• Repair or replace damaged wiring or connectors.

• Replace the defective airbag sensor.

Tools required

• OBD-II scanner

• Multimeter

• Screwdrivers

Estimated repair cost

$200 - $600

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Silverado

• GMC Sierra

• Cadillac Escalade

Preventive measures

• Regularly inspect airbag system components.

• Ensure connectors are secure and undamaged.

• Avoid tampering with airbag system wiring.

Error code type

Safety System Issue

User experience recommendations

• Do not ignore the airbag warning light.

• Consult a professional mechanic for repairs.

Warranty information

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

Historical data

B0029 has been a common code in vehicles with known airbag system issues, often due to aging components or manufacturing defects.

Urgency level

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

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.

• Ignition should be in the 'on' position.

Component location

The airbag module is typically located in the steering wheel or dashboard area.

FAQs

Q: Can I drive with the B0029 code?
A: It's not recommended to drive with an airbag fault, as the airbag may not deploy in an accident.

Q: Will disconnecting the battery clear the B0029 code?
A: Disconnecting the battery may reset the code temporarily, but it won't fix the underlying issue.

Last updated: Oct 6, 2025 • Source: internal database

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