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Engine-Codes – Lexus – C120C Lexus

C120C Lexus Code - Linear Solenoid Power Supply System Malfunction

Quick Answer

The C120C code for Lexus indicates a Linear Solenoid Power Supply System Malfunction. Common causes include Faulty linear solenoid, Electrical issues in the power supply system, Low transmission fluid levels. 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 Lexus indicates Linear Solenoid Power Supply System Malfunction.
Common causes
Common causes include Faulty linear solenoid, Electrical issues in the power supply system, Low transmission fluid levels.
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 05, 2024
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Code C120C Lexus Description

The C120C code for Lexus indicates a Linear Solenoid Power Supply System Malfunction. In simpler terms, this means that there is an issue with the power supply system that controls the linear solenoid within the vehicle. The linear solenoid is responsible for regulating the flow of hydraulic fluid within the transmission, which is crucial for smooth shifting and overall performance.

OBDII Code C120C Lexus - Linear Solenoid Power Supply System Malfunction
C120C Lexus Code - Linear Solenoid Power Supply System Malfunction

Common Causes of C120C Lexus

  1. Faulty linear solenoid
  2. Electrical issues in the power supply system
  3. Low transmission fluid levels
  4. Wiring or connector issues
  5. Internal transmission damage

Symptoms of C120C Lexus

  1. Rough or jerky shifting
  2. Delayed shifting between gears
  3. Transmission slipping
  4. Check Engine Light illuminated
  5. Reduced fuel efficiency

How to Fix C120C Lexus

  1. Diagnose the specific cause of the power supply system malfunction using a diagnostic scanner.
  2. Inspect the linear solenoid and associated wiring for any signs of damage or wear.
  3. Check transmission fluid levels and top up if necessary.
  4. Repair or replace any faulty components, such as the linear solenoid or damaged wiring.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix C120C Lexus

The typical repair costs for addressing a Linear Solenoid Power Supply System Malfunction in a Lexus can range from $200 to $600, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that the diagnosis time and labor rates at auto repair shops can vary, so it's recommended to check local rates for a more accurate estimate.

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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 Lexus Code

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

C120C indicates a "Linear Solenoid Power Supply System Malfunction," which typically relates to an issue with the power supply circuit for the solenoids in the vehicle's braking or stability control systems.

2. What are the common symptoms of a C120C code in a Lexus?

Symptoms may include an illuminated ABS or traction control warning light, reduced braking performance, and potential loss of stability control functions.

3. What causes the C120C code to appear on a Lexus?

The code can be triggered by a faulty solenoid, damaged wiring or connectors in the power supply circuit, a malfunctioning ABS control module, or a blown fuse related to the braking system.

4. Can I drive my Lexus with a C120C code active?

While the car may still be drivable, the ABS and stability control systems may not function properly, increasing the risk of skidding or losing control in slippery conditions. It’s best to address the issue promptly.

5. How is the C120C code diagnosed on a Lexus?

A technician will use a scan tool to retrieve the code, inspect the wiring and connectors for damage, test the solenoid power supply, and check the ABS control module for faults.

6. What repairs are needed to fix a C120C code?

Repairs may involve replacing a faulty solenoid, repairing or replacing damaged wiring, cleaning or securing electrical connectors, or replacing the ABS control module if it’s defective.

7. How much does it cost to fix a C120C code on a Lexus?

Costs can range from $100 to $1,000 or more, depending on whether the issue is a simple wiring repair or requires replacement of expensive components like the ABS control module.

8. Can a low battery cause the C120C code on a Lexus?

Yes, a weak or failing battery can sometimes cause voltage-related issues, potentially triggering this code. Ensure the battery and charging system are in good condition.

9. Is the C120C code specific to Lexus vehicles?

While C120C is common in Lexus models, similar codes may appear in other vehicles with advanced braking systems. Always reference the specific manufacturer's documentation.

10. How can I prevent the C120C code from reoccurring in my Lexus?

Regular maintenance, such as inspecting wiring and connectors for wear, ensuring proper battery health, and addressing warning lights promptly, can help prevent this issue.

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