AutoCodes – Generic – C0120

C0120 Code - Front Inlet Valve Left

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Front Inlet Solenoid Valve Left. Common causes include Faulty Front Inlet Solenoid Valve Left, Front Inlet Solenoid Valve Left harness is open or shorted, Front Inlet Solenoid Valve Left 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: C0120 indicates Front Inlet Valve Left.
Common causes: Common causes include Faulty Front Inlet Solenoid Valve Left, Front Inlet Solenoid Valve Left harness is open or shorted, Front Inlet Solenoid Valve Left 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 5,479

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 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0120 Description

The Anti-Lock Brake System (ABS) Module monitors the Front Inlet Solenoid Valve Left. The ABS Module sets the OBDII code when the Front Inlet Solenoid Valve Left is not to factory specifications.

OBDII Code C0120 - Front Inlet Valve Left - AutoCodes.com — C0120 Code - Front Inlet Valve Left

What does this mean?

What are the Possible Causes of the DTC C0120?

Faulty Front Inlet Solenoid Valve Left
Front Inlet Solenoid Valve Left harness is open or shorted
Front Inlet Solenoid Valve Left circuit poor electrical connection

How to Fix the DTC C0120?

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 C0120 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 C0120 code?

Need more information on how to fix the C0120 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0120 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0120 Subaru — Front Inlet Valve Left

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 C0120 Code

1. What are the common symptoms of OBDII code C0120 (Front Inlet Valve Left)?

The common symptoms of OBDII code C0120 (Front Inlet Valve Left) include a spongy or soft brake pedal, reduced braking performance, and potential illumination of the ABS warning light on the dashboard.

2. What are the possible causes of OBDII code C0120?

Possible causes of OBDII code C0120 include a faulty front inlet valve left, damaged wiring or connectors in the ABS system, low brake fluid levels, or air in the brake system.

3. How can I diagnose OBDII code C0120?

Diagnosing OBDII code C0120 usually involves using a professional OBDII scanner to read the code, conducting a visual inspection of the ABS system components, and checking the wiring and connectors for any damage or corrosion.

4. Can I still drive my vehicle with OBDII code C0120 active?

It is not recommended to drive your vehicle with OBDII code C0120 active, as it can affect the proper functioning of the ABS system and compromise your vehicle's braking performance and safety.

5. How can I repair OBDII code C0120?

Repairing OBDII code C0120 typically involves replacing the front inlet valve left, repairing any damaged wiring or connectors, bleeding the brake system to remove air, and clearing the code with a diagnostic tool.

6. Are there any DIY tips for fixing OBDII code C0120?

While some basic troubleshooting steps can be done by DIY enthusiasts, it is recommended to seek professional help for repairing OBDII code C0120, as it involves working with the ABS system, which is critical for your vehicle's safety.

7. How much does it cost to repair OBDII code C0120?

The cost of repairing OBDII code C0120 can vary depending on the specific issue causing the code, the make and model of your vehicle, and the labor rates at your chosen repair shop. It's best to get a few quotes from different mechanics to compare prices.

8. Can OBDII code C0120 cause other problems in my vehicle?

Yes, if left unrepaired, OBDII code C0120 can potentially lead to further damage to the ABS system, decreased braking performance, and compromised safety while driving. It's important to address the issue promptly.

9. How often does OBDII code C0120 occur in vehicles?

OBDII code C0120 (Front Inlet Valve Left) can occur in vehicles equipped with ABS systems, especially in older vehicles or those that have experienced significant wear and tear on the braking components.

10. Is it safe to reset the OBDII code C0120 without repairing the issue?

Resetting the OBDII code C0120 without addressing the underlying problem is not recommended, as the issue will likely reoccur, leading to potential safety risks and further damage to the ABS system. It's best to repair the problem first before clearing the code.