AutoCodes – Toyota – C142B Toyota

C142B Toyota Code - Motor Power Supply Voltage Circuit

Quick Answer

The Motor Relay and motor fail-safe relay are built into the Brake Actuator Assembly. Common causes include Faulty Skid Control ECU (Brake Actuator Assembly), Skid Control ECU harness is open or shorted, Skid Control ECU 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: C142B Toyota indicates Motor Power Supply Voltage Circuit.
Common causes: Common causes include Faulty Skid Control ECU (Brake Actuator Assembly), Skid Control ECU harness is open or shorted, Skid Control ECU 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 770

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 Sep 30, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C142B Toyota Description

The Motor Relay and motor fail-safe relay are built into the Brake Actuator Assembly. During ABS, TRAC, VSC, brake hold, or brake assist operation, the Skid Control ECU (Brake Actuator Assembly) turns on the motor relay to run the pump motor in the Brake Actuator Assembly. When a motor system Diagnostic Trouble Code (DTC) is stored, the motor fail-safe relay cuts the power source supply to the motor relay for fail-safe operation.
This DTC may be stored when the voltage to the motor relay power source is lower than the DTC detection condition due to low output from the battery or alternator.

OBDII Code C142B Toyota - Motor Power Supply Voltage Circuit - AutoCodes.com — C142B Toyota Code - Motor Power Supply Voltage Circuit

What does this mean?

What are the Possible Causes of the DTC C142B Toyota?

Faulty Skid Control ECU (Brake Actuator Assembly)
Skid Control ECU harness is open or shorted
Skid Control ECU circuit poor electrical connection

How to Fix the DTC C142B Toyota?

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 C142B Toyota 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.

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Information for Specific Toyota Models

C142B 2013 Toyota RAV4 — Motor Power Supply Voltage Circuit
C142B 2014 Toyota RAV4 — Motor Power Supply Voltage Circuit
C142B 2015 Toyota RAV4 — Motor Power Supply Voltage Circuit
C142B 2016 Toyota RAV4 — Motor Power Supply Voltage Circuit
C142B 2017 Toyota RAV4 — Motor Power Supply Voltage Circuit
C142B 2018 Toyota RAV4 — Motor Power Supply Voltage Circuit

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 C142B Toyota Code

1. What does the OBDII code C142B mean on a Toyota?

C142B indicates an issue with the Motor Power Supply Voltage Circuit, which is part of the vehicle's braking and stability control system.

2. What are common symptoms of the C142B code in a Toyota?

Symptoms may include the ABS warning light or traction control light turning on, reduced braking performance, or loss of stability control functions.

3. What causes the C142B code to trigger in a Toyota?

Common causes include a faulty motor relay, damaged wiring or connectors in the power supply circuit, a weak battery, or issues with the ABS pump assembly.

4. Can a low battery cause the C142B code in a Toyota?

Yes, a low or failing battery can lead to insufficient voltage in the motor power supply circuit, triggering the C142B code.

5. How do you diagnose the C142B code in a Toyota?

Diagnosis involves checking the battery voltage, inspecting the motor relay, testing the wiring and connectors in the circuit, and verifying the functionality of the ABS motor.

6. Can you drive with the C142B code in a Toyota?

Driving with this code is not recommended, as it can affect the ABS and stability control system, leading to reduced braking performance and safety risks.

7. How is the C142B code fixed in a Toyota?

Repairs may include replacing a faulty motor relay, repairing damaged wiring or connectors, recharging or replacing the battery, or servicing the ABS pump assembly.

8. What tools are needed to troubleshoot the C142B code in a Toyota?

A diagnostic scan tool, a multimeter to check voltage, and wiring diagrams for the ABS system are typically needed for troubleshooting.

9. How much does it cost to repair the C142B code in a Toyota?

Repair costs vary depending on the root cause but may range from $100 for minor wiring repairs to $1,000 or more if the ABS pump assembly needs replacement.

10. Can the C142B code in a Toyota be cleared without repairs?

The code may temporarily clear if reset with a scan tool, but it will likely return unless the underlying issue is fixed.