C142B Lexus 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 Lexus 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.
Code C142B Lexus Description
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.
What are the Possible Causes of the DTC C142B Lexus?
- 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 Lexus?
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 Lexus 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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Frequently Asked Questions about C142B Lexus Code
1. What does the OBDII code C142B mean on a Lexus?
C142B indicates an issue with the motor power supply voltage circuit, which affects the power supply to components like the ABS motor.
2. What are the common symptoms of code C142B in a Lexus?
Symptoms may include the ABS or traction control warning light turning on, reduced braking performance, or a failure of the ABS system to function properly.
3. What causes the C142B code to appear in a Lexus?
Common causes include a faulty ABS motor relay, damaged wiring or connectors in the motor power supply circuit, or a failing ABS motor assembly.
4. Can I still drive my Lexus with a C142B code?
While the vehicle may still be drivable, the ABS system may not function correctly, increasing the risk of wheel lockup during hard braking. It’s best to address the issue promptly.
5. How do I diagnose the C142B code in my Lexus?
Diagnosis involves using a scan tool to confirm the code, inspecting the ABS motor relay, checking the wiring and connectors for damage, and testing the motor power supply voltage.
6. How can I fix the C142B code on my Lexus?
Repairs may include replacing a faulty ABS motor relay, repairing or replacing damaged wiring or connectors, or replacing the ABS motor assembly if it’s defective.
7. How much does it cost to fix the C142B code in a Lexus?
Repair costs vary depending on the issue. Replacing an ABS motor relay typically costs $50–$150, while replacing the ABS motor assembly can range from $500 to $1,200.
8. Can a low battery cause the C142B code in a Lexus?
Yes, a weak or failing battery can lead to insufficient power supply to the ABS motor, potentially triggering the C142B code.
9. How do I prevent the C142B code from occurring in my Lexus?
Regularly inspect and maintain the ABS system, ensure the battery is in good condition, and address any electrical issues promptly to prevent voltage-related errors.
10. Do I need a professional mechanic to fix the C142B code on my Lexus?
While experienced DIYers can handle minor repairs like replacing a relay, diagnosing and fixing wiring issues or ABS motor problems often requires professional expertise.
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