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 » C0055

Code C0055

Symptoms

• ABS warning light on

• Traction control light on

• Inoperative ABS or traction control system

Common Causes

• Faulty rear wheel speed sensor

• Damaged wiring or connectors

• Malfunctioning ABS module

Glossary

ABS: Anti-lock Braking System

OBD-II: On-Board Diagnostics, Second Generation

Related Codes

• C0035

• C0040

Laymans terms

This code means there's a problem with the car's wheel speed sensor, which helps the car know how fast each wheel is turning.

Explanation

C0055 indicates a malfunction in the rear wheel speed sensor circuit.

Technical description

The C0055 code is triggered when the Anti-lock Brake System (ABS) module detects a problem with the rear wheel speed sensor or its circuit. This sensor is crucial for monitoring the speed of the wheel to help with braking and stability control.

Diagnosis steps

• Check for any visible damage to the wheel speed sensor or wiring.

• Use a multimeter to test the sensor's resistance.

• Inspect the ABS module for any fault codes or issues.

Repair procedures

• Replace the faulty wheel speed sensor.

• Repair or replace damaged wiring/connectors.

• Reset the ABS system and test drive the vehicle.

Tools required

• OBD-II scanner

• Multimeter

• Basic hand tools

Estimated repair cost

$100 - $300

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Silverado

• GMC Sierra

• Cadillac Escalade

Preventive measures

• Regularly inspect wheel speed sensors.

• Keep the wheel area clean and free of debris.

• Check ABS system during routine maintenance.

Error code type

Sensor Issue

User experience recommendations

• Do not ignore the ABS warning light.

• Drive cautiously until repairs are made.

• Consult a professional mechanic if unsure.

Warranty information

Check with your vehicle manufacturer for specific warranty coverage on ABS components.

Historical data

C0055 has been a common code for vehicles equipped with ABS systems, often related to sensor wear or damage.

Urgency level

Moderate – This issue should be addressed soon to ensure proper braking performance.

Legal and safety notice

Driving with a malfunctioning ABS system can increase stopping distances and affect vehicle stability.

Testing conditions

• Vehicle stationary

• Ignition in the 'On' position

Component location

The rear wheel speed sensor is typically located near the wheel hub or axle of the rear wheels.

FAQs

Q: Can I drive my car with a C0055 code?
A: While you can drive, it's not recommended as the ABS system may not function properly, affecting braking performance.

Q: How can I reset the ABS light?
A: After fixing the issue, you can use an OBD-II scanner to clear the code and reset the ABS light.

Last updated: May 17, 2026 • Source: internal database

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