AutoCodes – Generic – C012E

C012E Code - Hydraulic Brake Boost Pressure Loss

Quick Answer

The boost pressure valve is internal to the brake pressure modulator. 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: C012E indicates Hydraulic Brake Boost Pressure Loss.
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 3,323

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 08, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C012E Description

The boost pressure valve is internal to the brake pressure modulator. The Electronic Brake Control Module (EBCM) monitors the boost pressure. The boost valve controls the amount of hydraulic boost required during braking or a vehicle stability event.
When a boost fault condition is detected, the boost control will continue applying as much pressure as possible until boost pressure is no longer available.

OBDII Code C012E - Hydraulic Brake Boost Pressure Loss - AutoCodes.com — C012E Code - Hydraulic Brake Boost Pressure Loss

What does this mean?

What are the Possible Causes of the DTC C012E?

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

How to Fix the DTC C012E?

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 does this mean?

Code Tech Notes

DTC C012E 00 Hydraulic Brake Boost Pressure Loss Malfunction
DTC C012E 12 Hydraulic Brake Boost Pressure Loss Low Input

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C012E 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 C012E code?

Need more information on how to fix the C012E code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C012E code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C012E Buick — Hydraulic Brake Boost Pressure Loss
C012E Cadillac — Hydraulic Brake Boost Pressure Loss
C012E Chevrolet — Hydraulic Brake Boost Pressure Loss
C012E GMC — Hydraulic Brake Boost Pressure Loss

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 C012E Code

1. What are the common symptoms of OBDII code C012E (Hydraulic Brake Boost Pressure Loss)?

The common symptoms include a soft or spongy brake pedal, increased stopping distance, and potential loss of brake assist.

2. What are the possible causes of OBDII code C012E?

Possible causes of this code include a faulty brake booster, a leak in the brake booster system, or issues with the brake master cylinder.

3. How can I diagnose the cause of OBDII code C012E?

Diagnosing the cause typically involves checking for any visible leaks in the brake booster system, testing the brake booster for proper operation, and inspecting the brake master cylinder for any issues.

4. Can I continue driving with OBDII code C012E present?

It is not recommended to continue driving with this code present, as it can compromise the effectiveness of your vehicle's braking system and pose a safety risk.

5. How is OBDII code C012E (Hydraulic Brake Boost Pressure Loss) typically repaired?

Repairs for this code may involve replacing the faulty brake booster, repairing any leaks in the system, or addressing any issues with the brake master cylinder.

6. Can a DIY enthusiast repair OBDII code C012E at home?

While some experienced DIY enthusiasts may be able to address this issue, it is recommended to have a professional mechanic diagnose and repair the problem to ensure proper function and safety.

7. Are there any preventive maintenance tips to avoid OBDII code C012E?

Regularly checking the brake system for leaks, maintaining proper brake fluid levels, and addressing any brake-related symptoms promptly can help prevent issues that lead to this code.

8. How urgent is it to address OBDII code C012E?

It is crucial to address this code promptly to ensure the safe operation of your vehicle and maintain the effectiveness of the braking system.

9. Can OBDII code C012E be triggered by other underlying issues?

While this code is typically related to hydraulic brake boost pressure loss, it is essential to address any other potential brake system issues that could contribute to the problem.

10. Is it necessary to reset the OBDII system after repairing code C012E?

After repairing the issue causing code C012E, it is recommended to reset the OBDII system to clear the code and ensure that the repair was successful.