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C120C Mitsubishi Code - Abnormality In FR/RL Wheel Suction Valve System

Quick Answer

The C120C diagnostic trouble code (DTC) for Mitsubishi vehicles indicates an abnormality in the FR/RL (Front Right/Rear Left) wheel suction valve system. Common causes include Faulty FR/RL wheel suction valve, Damaged wiring or connectors in the ABS system, Malfunctioning wheel speed sensors. 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
C120C Mitsubishi indicates Abnormality In FR/RL Wheel Suction Valve System.
Common causes
Common causes include Faulty FR/RL wheel suction valve, Damaged wiring or connectors in the ABS system, Malfunctioning wheel speed sensors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 19, 2024
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Code C120C Mitsubishi Description

The C120C diagnostic trouble code (DTC) for Mitsubishi vehicles indicates an abnormality in the FR/RL (Front Right/Rear Left) wheel suction valve system. This system is a part of the vehicle's anti-lock braking system (ABS) and is responsible for controlling the pressure in the brake lines to prevent wheel lock-up during braking. When this code is triggered, it means that there is a malfunction in the suction valve system, which can affect the vehicle's braking performance and overall safety.

OBDII Code C120C Mitsubishi - Abnormality In FR/RL Wheel Suction Valve System
C120C Mitsubishi Code - Abnormality In FR/RL Wheel Suction Valve System

Common Causes of C120C Mitsubishi

  1. Faulty FR/RL wheel suction valve
  2. Damaged wiring or connectors in the ABS system
  3. Malfunctioning wheel speed sensors
  4. ABS control module failure
  5. Corrosion or debris affecting the suction valve system

Symptoms of C120C Mitsubishi

  1. Illumination of the ABS warning light on the dashboard
  2. Increased stopping distances during braking
  3. Pulsation or vibration in the brake pedal
  4. Loss of traction or stability during braking
  5. Unusual noises coming from the ABS system during operation

How to Fix C120C Mitsubishi

  1. Diagnose the specific cause of the C120C code using a professional OBD-II scanner and ABS system diagnostic tools.
  2. Inspect the FR/RL wheel suction valve, wiring, and connectors for any visible damage or corrosion.
  3. Test the wheel speed sensors to ensure they are functioning correctly and providing accurate data to the ABS control module.
  4. Replace any faulty components such as the suction valve, wiring harness, sensors, or ABS control module as needed.
  5. Clear the DTC from the vehicle's memory and perform a road test to verify that the issue has been resolved and the ABS system is operating properly.

Cost to Fix C120C Mitsubishi

The cost of repairing an abnormality in the FR/RL wheel suction valve system can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the parts for this repair can range from $200 to $600, while labor costs can add an additional $150 to $300. Overall, the total repair cost for this issue may fall between $350 and $900. It is important to note that these estimates are general guidelines, and actual costs may differ based on the vehicle's make and model, as well as the labor rates charged by auto repair shops in different locations. It is recommended to obtain quotes from multiple reputable shops to ensure a fair price for the repair.

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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 C120C Mitsubishi Code

1. What does the OBDII code C120C mean on a Mitsubishi?

C120C refers to an "Abnormality in FR/RL Wheel Suction Valve System," indicating a potential issue with the hydraulic brake control system related to the front right (FR) and rear left (RL) wheel valves.

2. What are the common symptoms of code C120C on a Mitsubishi?

Common symptoms include the ABS warning light illuminating, reduced braking performance, and potential loss of ABS functionality.

3. What causes the C120C code to appear?

This code is typically caused by a malfunctioning ABS hydraulic control unit, faulty wheel speed sensors, damaged wiring, or a failure in the suction valve system.

4. Can a faulty wheel speed sensor trigger code C120C?

Yes, a faulty wheel speed sensor can contribute to this code if it interferes with the hydraulic control system's ability to regulate wheel braking pressure.

5. How is the C120C code diagnosed?

Diagnosis usually involves scanning for stored codes, inspecting the ABS hydraulic unit, checking wheel speed sensors, and testing the wiring and connectors for continuity or damage.

6. Can I continue driving with the C120C code active?

While the vehicle may still be drivable, you should address the issue promptly as it can affect ABS functionality and overall braking performance, posing a safety risk.

7. What repairs are commonly needed to fix the C120C code?

Repairs may include replacing the ABS hydraulic control unit, repairing or replacing wiring, or addressing issues with the suction valve or wheel speed sensors.

8. How much does it cost to fix a C120C code on a Mitsubishi?

Repair costs vary depending on the root cause, but replacing an ABS hydraulic control unit can cost between $500 and $1,500, while simpler fixes like sensor replacement may cost less.

9. Can clearing the C120C code with a scanner fix the issue?

Clearing the code may temporarily turn off the warning light, but the underlying issue must be repaired to prevent the code from returning.

10. Is the C120C code specific to Mitsubishi vehicles?

While the code format is part of the OBDII system, the specific definition and application of C120C as "Abnormality in FR/RL Wheel Suction Valve System" is specific to Mitsubishi.

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