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 » C0618

Code C0618

Symptoms

• ABS warning light is on

• Reduced braking performance

• Unusual brake pedal feel

Common Causes

• Faulty brake pressure sensor

• Damaged wiring or connectors

• Malfunctioning ABS control module

Glossary

ABS: Anti-lock Braking System

OBD-II: On-Board Diagnostics II

Related Codes

• C0619

• C0620

Laymans terms

This code means there's a problem with the car's brake system, which helps the car stop safely.

Explanation

C0618 is a diagnostic trouble code related to the vehicle's brake system.

Technical description

The C0618 code indicates an issue with the brake pressure sensor, which is responsible for monitoring the pressure within the brake system to ensure optimal braking performance.

Diagnosis steps

• Inspect the brake pressure sensor for damage.

• Check the wiring and connectors for any signs of wear or damage.

• Test the ABS control module for proper operation.

Repair procedures

• Replace the brake pressure sensor if faulty.

• Repair or replace damaged wiring or connectors.

• Reprogram or replace the ABS control module if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Brake pressure sensor tool

Estimated repair cost

$100 - $300

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Silverado

• GMC Sierra

• Cadillac Escalade

Preventive measures

• Regular brake system maintenance

• Inspect brake components periodically

• Ensure proper brake fluid levels

Error code type

Sensor Issue

User experience recommendations

• Do not ignore the ABS warning light.

• Have the brake system inspected by a professional.

Warranty information

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

Historical data

This code has been reported in vehicles with high mileage and those that have not undergone regular brake maintenance.

Urgency level

High – Brake system issues can affect vehicle safety.

Legal and safety notice

Driving with a faulty brake system can be dangerous and may not comply with safety regulations.

Testing conditions

• Vehicle stationary

• Engine running

Component location

The brake pressure sensor is typically located near the brake master cylinder or within the ABS module.

FAQs

Q: Can I drive with a C0618 code?
A: It's not recommended to drive with this code as it can affect braking performance.

Q: How do I reset the ABS light?
A: Repair the underlying issue first, then use an OBD-II scanner to clear the code.

Last updated: Apr 20, 2026 • Source: internal database

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