AutoCodes – Generic – C142A

C142A Code - Master Cylinder Pressure Sensor Internal Malfunction

Quick Answer

The Master Cylinder Pressure Sensor is connected to the Skid Control ECU (Brake Actuator Assembly). Common causes include Faulty Brake Actuator Assembly (Master Cylinder Pressure Sensor), Brake Actuator Assembly harness is open or shorted, Brake Actuator Assembly 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: C142A indicates Master Cylinder Pressure Sensor Internal Malfunction.
Common causes: Common causes include Faulty Brake Actuator Assembly (Master Cylinder Pressure Sensor), Brake Actuator Assembly harness is open or shorted, Brake Actuator Assembly 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 462

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 Jan 29, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C142A Description

The Master Cylinder Pressure Sensor is connected to the Skid Control ECU (Brake Actuator Assembly). The Skid Control ECU monitors the Master Cylinder Pressure Sensor. The Skid Control ECU sets the Diagnostic Trouble Code (DTC) when the Master Cylinder Pressure Sensor is not to factory specifications.

OBDII Code C142A - Master Cylinder Pressure Sensor Internal Malfunction - AutoCodes.com — C142A Code - Master Cylinder Pressure Sensor Internal Malfunction

What does this mean?

What are the Possible Causes of the DTC C142A?

Faulty Brake Actuator Assembly (Master Cylinder Pressure Sensor)
Brake Actuator Assembly harness is open or shorted
Brake Actuator Assembly circuit poor electrical connection

How to Fix the DTC C142A?

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 C142A 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 C142A code?

Need more information on how to fix the C142A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C142A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C142A Lexus — Master Cylinder Pressure Sensor Internal Malfunction
C142A Scion — Master Cylinder Pressure Sensor Internal Malfunction
C142A Toyota — Master Cylinder Pressure Sensor Internal Malfunction

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 C142A Code

1. What does the OBDII code C142A mean?

C142A indicates an internal malfunction in the master cylinder pressure sensor, which monitors brake system pressure.

2. What are the common symptoms of code C142A?

Symptoms may include the ABS or brake warning light turning on, reduced braking performance, or unresponsive ABS functionality.

3. What causes the C142A code to appear?

Common causes include a faulty master cylinder pressure sensor, damaged wiring or connectors, or issues with the ABS module.

4. Can I drive with a C142A code?

It’s not recommended to drive with this code, as it may impact braking performance and ABS functionality, potentially compromising safety.

5. How do I diagnose the C142A code?

Start by inspecting the master cylinder pressure sensor, wiring, and connectors for damage. A scan tool can confirm the fault and help test sensor operation.

6. How is the C142A code fixed?

Repairs may involve replacing the master cylinder pressure sensor, repairing damaged wiring, or recalibrating the ABS module if necessary.

7. Can a weak battery cause the C142A code?

A weak or failing battery can sometimes trigger ABS-related codes, but the primary issue is typically with the sensor or its circuit.

8. How much does it cost to fix a C142A code?

Repair costs vary but may range from $150 to $500, depending on whether the sensor, wiring, or ABS module needs attention.

9. Does clearing the code fix the C142A issue?

Clearing the code without addressing the underlying problem will not fix the issue, and the code will likely return.

10. Can the C142A code be caused by low brake fluid?

While low brake fluid can cause other brake system issues, it is unlikely to directly trigger the C142A code, as this code relates to the master cylinder pressure sensor.