AutoCodes – Chevrolet – C12B3 Chevrolet

C12B3 Chevrolet Code - ABS Master Cylinder Pressure Sensor Circuit Short To Battery

Quick Answer

The Electronic Brake Control Module (EBCM) uses input from the master cylinder pressure sensor for more accurate control during a vehicle stability enhancement system event. Common causes include Faulty Brake Pressure Modulator, Brake Pressure Modulator harness is open or shorted, Brake Pressure Modulator circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C12B3 Chevrolet indicates ABS Master Cylinder Pressure Sensor Circuit Short To Battery.
Common causes: Common causes include Faulty Brake Pressure Modulator, Brake Pressure Modulator harness is open or shorted, Brake Pressure Modulator circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 945

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C12B3 Chevrolet Description

The Electronic Brake Control Module (EBCM) uses input from the master cylinder pressure sensor for more accurate control during a vehicle stability enhancement system event. The master cylinder pressure sensor is internal to the brake pressure modulator.

OBDII Code C12B3 Chevrolet - ABS Master Cylinder Pressure Sensor Circuit Short To Battery - AutoCodes.com — C12B3 Chevrolet Code - ABS Master Cylinder Pressure Sensor Circuit Short To Battery

What does this mean?

What are the Possible Causes of the DTC C12B3 Chevrolet?

Faulty Brake Pressure Modulator
Brake Pressure Modulator harness is open or shorted
Brake Pressure Modulator circuit poor electrical connection

How to Fix the DTC C12B3 Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C12B3 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C12B3 Chevrolet code?

Need more information on how to fix the C12B3 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C12B3 Chevrolet code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C12B3 Chevrolet Code

1. What does the OBDII code C12B3 mean for a Chevrolet vehicle?

C12B3 indicates a problem with the ABS Master Cylinder Pressure Sensor Circuit, specifically a short to the battery.

2. What are the common symptoms of code C12B3 in a Chevrolet?

Symptoms may include the ABS warning light being illuminated, reduced braking performance, or the ABS system not functioning properly.

3. What causes the C12B3 code to appear in a Chevrolet?

The code is typically triggered by a short circuit in the master cylinder pressure sensor wiring, a faulty pressure sensor, or issues with the ABS module.

4. Can I drive my Chevrolet with the C12B3 code active?

While the vehicle may still be drivable, it is not recommended as the ABS system may be compromised, potentially affecting braking safety.

5. How do I diagnose the C12B3 code in my Chevrolet?

Diagnosis involves inspecting the wiring and connectors for damage, testing the master cylinder pressure sensor, and scanning the ABS module for additional codes.

6. What tools are needed to fix the C12B3 code?

A multimeter, OBDII scanner, and possibly a wiring diagram for your Chevrolet model are needed for diagnosis and repair.

7. Can a faulty ABS module cause the C12B3 code?

Yes, a malfunctioning ABS module can sometimes cause communication errors or shorts in the circuit, leading to the C12B3 code.

8. How much does it cost to fix the C12B3 code on a Chevrolet?

Repair costs can vary but typically range from $100 to $300 for wiring repairs, and $300 to $800 if the pressure sensor or ABS module needs replacement.

9. How do I reset the C12B3 code after repairs?

The code can be cleared using an OBDII scanner after the issue has been resolved, but it will reappear if the underlying problem persists.

10. Is the C12B3 code specific to Chevrolet vehicles?

While the code is common in Chevrolet vehicles, it may also appear in other brands with similar ABS systems. Always refer to your vehicle's service manual for specifics.