AutoCodes – GMC – C120A GMC

C120A GMC Code - ABS Pump Pressure Performance

Quick Answer

The Electronic Brake Control Module (EBCM) uses input from the boost pressure sensor for more accurate control during brake and 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: C120A GMC indicates ABS Pump Pressure Performance.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,072

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code C120A GMC Description

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

OBDII Code C120A GMC - ABS Pump Pressure Performance - AutoCodes.com — C120A GMC Code - ABS Pump Pressure Performance

What does this mean?

What are the Possible Causes of the DTC C120A GMC?

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

How to Fix the DTC C120A GMC?

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 C120A GMC 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 C120A GMC code?

Need more information on how to fix the C120A GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C120A GMC 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 C120A GMC Code

1. What are the common symptoms of OBDII code C120A GMC (ABS Pump Pressure Performance)?

- Common symptoms may include the ABS warning light being illuminated on the dashboard, poor braking performance, and unusual noises coming from the ABS system.

2. What are the possible causes of OBDII code C120A GMC (ABS Pump Pressure Performance)?

- Possible causes may include a malfunctioning ABS pump, low brake fluid levels, a faulty ABS control module, or issues with the wheel speed sensors.

3. How can I diagnose the OBDII code C120A GMC (ABS Pump Pressure Performance)?

- Diagnosis typically involves using a professional OBDII scanner to read the trouble codes stored in the ABS system and performing a visual inspection of the ABS components for any visible damage or leaks.

4. What are some repair tips for fixing OBDII code C120A GMC (ABS Pump Pressure Performance)?

- Repair tips may include checking and topping up the brake fluid, inspecting and potentially replacing the ABS pump or control module, and ensuring proper installation of the wheel speed sensors.

5. Can I drive my vehicle with OBDII code C120A GMC (ABS Pump Pressure Performance) present?

- It is not recommended to drive the vehicle with this code present, as it can affect the proper functioning of the ABS system and compromise braking performance.

6. How much does it typically cost to repair OBDII code C120A GMC (ABS Pump Pressure Performance)?

- The cost of repairs can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Is it possible to reset OBDII code C120A GMC (ABS Pump Pressure Performance) without repairs?

- While clearing the code with an OBDII scanner may temporarily turn off the warning light, the underlying issue causing the code will likely persist and should be addressed to ensure safe driving.

8. Can a DIY enthusiast fix OBDII code C120A GMC (ABS Pump Pressure Performance) at home?

- Some basic troubleshooting and maintenance tasks related to this code can be performed at home, but more complex repairs may require professional help due to the intricate nature of ABS systems.

9. How long does it take to repair OBDII code C120A GMC (ABS Pump Pressure Performance)?

- The repair time can vary depending on the cause of the issue and the extent of the repairs needed, but it may take anywhere from a few hours to a full day at the repair shop.

10. Are there any recalls or technical service bulletins related to OBDII code C120A GMC (ABS Pump Pressure Performance)?

- It's recommended to check with GMC dealerships or online resources for any recalls or technical service bulletins related to this specific OBDII code to see if there are known issues or remedies available.