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Code C0099

Symptoms

• ABS warning light on

• Reduced braking performance

• Unusual noises during braking

Common Causes

• Faulty wheel speed sensor

• Damaged wiring or connectors

• Malfunctioning brake control module

Glossary

OBD-II: On-Board Diagnostics, a system that monitors vehicle performance.

ABS: Anti-lock Braking System, a safety system that prevents wheels from locking up during braking.

Related Codes

• C0035

• C0040

Laymans terms

This code means there's a problem with one of the car's sensors that helps it stop safely. It's like when your toy car's brakes don't work well because something is blocking the wheels.

Explanation

C0099 is a chassis code related to a malfunction in a vehicle's braking system sensor.

Technical description

The C0099 code is triggered when the vehicle's control module detects an issue with one of the sensors responsible for monitoring the braking system. This could involve the wheel speed sensors or other components related to the braking system's electronic control.

Diagnosis steps

• Scan the vehicle for codes using an OBD-II scanner.

• Inspect the wheel speed sensors and wiring for damage.

• Test the brake control module for proper operation.

Repair procedures

• Replace the faulty wheel speed sensor.

• Repair or replace damaged wiring or connectors.

• Reprogram or replace the brake control module if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Basic hand tools

Estimated repair cost

$100 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Toyota Camry

• Ford F-150

• Honda Accord

Preventive measures

• Regularly inspect brake system components.

• Keep sensors and connectors clean and free of debris.

• Perform routine maintenance checks.

Error code type

Sensor Issue

User experience recommendations

• Do not ignore the ABS warning light.

• Have the braking system checked by a professional.

• Avoid driving in conditions that require heavy braking until repaired.

Warranty information

Check with the vehicle manufacturer for warranty coverage on brake system components.

Historical data

C0099 has been a common code in vehicles with advanced braking systems, often related to sensor failures due to wear and tear.

Urgency level

Moderate – It is important to address this issue soon to ensure safe braking performance.

Legal and safety notice

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

Testing conditions

• Vehicle must be on a flat surface.

• Ensure the vehicle is in park with the engine off before inspection.

Component location

The wheel speed sensors are typically located near the wheel hubs or brake rotors.

FAQs

Q: Can I drive with a C0099 code?
A: It's not recommended to drive with this code as it can affect your vehicle's braking performance.

Q: How can I reset the C0099 code?
A: The code can be reset using an OBD-II scanner, but it's important to fix the underlying issue first.

Last updated: Feb 1, 2026 • Source: internal database
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