AutoCodes – Toyota – C120B 2013 Toyota RAV4

C120B 2013 Toyota RAV4 Code - Ignition Supply Voltage Low

Quick Answer

The Diagnostic Trouble Code (DTC) will be set when the Master Cylinder Pressure Sensor power supply voltage decrease occurs, or a history of voltage decrease exists, and defective Master Cylinder Pressure Sensor output continues for 1 second or more. Common causes include Faulty Master Cylinder Pressure Sensor, Master Cylinder Pressure Sensor harness is open or shorted, Master Cylinder Pressure Sensor 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
C120B 2013 Toyota RAV4 indicates Ignition Supply Voltage Low.
Common causes
Common causes include Faulty Master Cylinder Pressure Sensor, Master Cylinder Pressure Sensor harness is open or shorted, Master Cylinder Pressure Sensor 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 217
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jan 18, 2023
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Code C120B 2013 Toyota RAV4 Description

The Diagnostic Trouble Code (DTC) will be set when the Master Cylinder Pressure Sensor power supply voltage decrease occurs, or a history of voltage decrease exists, and defective Master Cylinder Pressure Sensor output continues for 1 second or more.
OBDII Code C120B 2013 Toyota RAV4 - Ignition Supply Voltage Low - AutoCodes.com
C120B 2013 Toyota RAV4 Code - Ignition Supply Voltage Low

What are the Possible Causes of the DTC C120B 2013 Toyota RAV4?

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

How to Fix the DTC C120B 2013 Toyota RAV4?

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 C120B 2013 Toyota RAV4 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 C120B 2013 Toyota RAV4 code?

Need more information on how to fix the C120B 2013 Toyota RAV4 code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 C120B 2013 Toyota RAV4 Code

1. What does the OBDII code C120B in a 2013 Toyota RAV4 indicate?

The code C120B indicates that the ignition supply voltage is low in the vehicle.

2. What are the common symptoms of the C120B code in a 2013 Toyota RAV4?

Common symptoms include difficulty starting the vehicle, engine stalling, rough idling, and possible loss of power.

3. What are the possible causes of the C120B code in a 2013 Toyota RAV4?

Potential causes include a faulty ignition switch, a weak battery, poor electrical connections, or a failing ignition system component.

4. How can I diagnose the C120B code in my 2013 Toyota RAV4?

Diagnosing the code typically involves checking the battery voltage, inspecting the ignition switch and related wiring, and testing the ignition system components for proper function.

5. Can I still drive my 2013 Toyota RAV4 with the C120B code present?

It is not recommended to drive the vehicle with the C120B code active, as it can lead to potential issues such as stalling or loss of power while driving.

6. How can I repair the C120B code in my 2013 Toyota RAV4?

Repairing the code may involve replacing the faulty ignition switch, addressing any battery issues, repairing damaged wiring, or replacing malfunctioning ignition system components.

7. Should I reset the OBDII code C120B in my 2013 Toyota RAV4 after making repairs?

After making necessary repairs, it is advisable to reset the code using an OBDII scanner to clear the fault code and ensure proper functionality.

8. Can a DIY enthusiast tackle the repair of the C120B code in a 2013 Toyota RAV4?

While some aspects of diagnosing and repairing the code can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for an accurate diagnosis and proper repair.

9. How much can I expect to pay to repair the C120B code in my 2013 Toyota RAV4?

The cost of repairing the C120B code can vary depending on the underlying issue, but it may range from $100 to $500 or more, including parts and labor.

10. Is the C120B code specific to the 2013 Toyota RAV4, or can it occur in other vehicles?

While the C120B code is associated with the 2013 Toyota RAV4, similar codes related to low ignition supply voltage may occur in other vehicle makes and models as well.

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