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 » B0103

Code B0103

Symptoms

• Airbag warning light illuminated

• Airbag may not deploy in an accident

• Error message on the dashboard

Common Causes

• Faulty passenger airbag sensor

• Damaged wiring or connectors

• Malfunctioning airbag control module

Glossary

Airbag: A safety device in vehicles that inflates upon impact to protect passengers.

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

Related Codes

• B0100

• B0101

Laymans terms

This code means there's a problem with the airbag system in your car. It's like when a toy doesn't work because a part inside is broken.

Explanation

The B0103 code indicates an issue with the passenger airbag circuit, possibly due to a faulty sensor or wiring problem.

Technical description

B0103 is a diagnostic trouble code for a malfunction in the passenger airbag circuit. This could be due to a short or open circuit, or a defective sensor.

Diagnosis steps

• Check the airbag warning light and dashboard for error messages.

• Inspect the wiring and connectors for damage.

• Test the passenger airbag sensor for proper operation.

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

$150 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Toyota Camry

• Honda Accord

• Ford Focus

Preventive measures

• Regularly inspect airbag system components.

• Avoid tampering with the airbag system.

• Have the airbag system checked during routine maintenance.

Error code type

Sensor Issue

User experience recommendations

• Do not ignore the airbag warning light.

• Have the issue diagnosed by a professional.

• Avoid driving the vehicle until the problem is fixed.

Warranty information

Airbag system components may be covered under a vehicle's safety warranty.

Historical data

This code has been associated with airbag system recalls in some models.

Urgency level

High – Airbag system issues can affect vehicle safety.

Legal and safety notice

It is illegal to drive a vehicle with a malfunctioning airbag system in some regions.

Testing conditions

• Vehicle ignition in the ON position.

• Airbag system self-diagnostic test completed.

Component location

The passenger airbag sensor is typically located in the dashboard or seat area.

FAQs

Q: Can I drive with the B0103 code?
A: It's not recommended to drive with this code, as the airbag may not deploy in an accident.

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

Last updated: Oct 7, 2025 • Source: internal database

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