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 » B0074

Code B0074

Symptoms

• Airbag warning light illuminated

• Airbags may not deploy in a crash

• Error message on the dashboard

Common Causes

• Faulty crash sensor

• Damaged wiring or connectors

• Malfunctioning airbag control module

Glossary

Crash Sensor: A device that detects sudden deceleration and triggers the airbag deployment.

Airbag Control Module: The electronic unit that manages the airbag system.

Related Codes

• B0075

• B0076

Laymans terms

This code means there's a problem with the car's airbag system. It's like when a toy doesn't work because its battery is loose.

Explanation

B0074 indicates an issue with the airbag system, specifically related to a sensor malfunction.

Technical description

The B0074 code is triggered when the airbag control module detects a fault in one of the crash sensors. This could be due to a faulty sensor, wiring issues, or a problem with the control module itself.

Diagnosis steps

• Scan the vehicle with an OBD-II scanner to confirm the code.

• Inspect the wiring and connectors for damage or corrosion.

• Test the crash sensors for proper operation.

Repair procedures

• Replace the faulty crash sensor.

• Repair or replace damaged wiring or connectors.

• Reset the airbag control module and clear the code.

Tools required

• OBD-II scanner

• Multimeter

• Socket set

Estimated repair cost

$100 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Malibu

• Ford Focus

• Toyota Camry

Preventive measures

• Regularly inspect airbag system components.

• Avoid moisture exposure to wiring and connectors.

• 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.

• Avoid driving the vehicle until the issue is resolved.

Warranty information

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

Historical data

The B0074 code has been reported in various vehicle models, often related to sensor or wiring issues.

Urgency level

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

Legal and safety notice

Driving with a malfunctioning airbag system can be dangerous and may violate safety regulations.

Testing conditions

• Vehicle stationary

• Ignition in the 'On' position

Component location

Crash sensors are typically located in the front of the vehicle, near the bumper or radiator support.

FAQs

Q: Can I drive with the B0074 code?
A: It's not recommended to drive with this code, as it indicates a potential airbag malfunction.

Q: How do I reset the airbag light?
A: After repairs, use an OBD-II scanner to clear the code and reset the airbag light.

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

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