AutoCodes – Generic – C120A

C120A 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 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.

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Code Popularity 6,964

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

What does this mean?

What are the Possible Causes of the DTC C120A?

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?

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 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 code?

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

Need Help with the Code?

Get the C120A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C120A Buick — ABS Pump Pressure Performance
C120A Cadillac — ABS Pump Pressure Performance
C120A Chevrolet — ABS Pump Pressure Performance
C120A GMC — ABS Pump Pressure Performance
C120A Lexus — ECU Initial Setting Incomplete
C120A Scion — ECU Initial Setting Incomplete
C120A Toyota — ECU Initial Setting Incomplete

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 Code

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

- Common symptoms include illuminated ABS warning light, traction control light, and potential loss of ABS functionality.

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

- Possible causes include a faulty ABS pump, damaged ABS sensors, low brake fluid level, or malfunctioning hydraulic control unit.

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

- Diagnose the code by using a professional OBDII scanner to read and interpret the ABS system data for specific error codes and sensor readings.

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

- It is not recommended to drive the vehicle with this code, as it can compromise the effectiveness of the ABS system and impact overall braking performance.

5. How can I repair OBDII code C120A (ABS Pump Pressure Performance)?

- Repair options include checking and replacing the ABS pump, inspecting and replacing ABS sensors, verifying brake fluid levels, and ensuring proper hydraulic control unit function.

6. Is it safe to continue driving if the ABS warning light is on due to code C120A?

- It is not safe to drive with the ABS warning light on, as it indicates a potential issue with the ABS system that could affect braking performance.

7. Can a DIY enthusiast perform repairs for OBDII code C120A?

- While some basic diagnostics can be performed by DIY enthusiasts, it is recommended to consult a professional mechanic for accurate diagnosis and repair of ABS system issues.

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

- Repair costs can vary depending on the specific issue causing the code, but expect to pay for parts and labor, with potential costs ranging from a couple of hundred to over a thousand dollars.

9. Are there any temporary solutions to address OBDII code C120A until it can be repaired?

- There are no recommended temporary solutions for this ABS-related code, as it is crucial to address the underlying issue promptly to ensure vehicle safety.

10. How often should the ABS system be inspected to prevent OBDII code C120A from occurring?

- It is recommended to have the ABS system inspected as part of regular vehicle maintenance to detect and address potential issues before they trigger OBDII code C120A.