C120B 2014 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 2014 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.
Code C120B 2014 Toyota RAV4 Description
What are the Possible Causes of the DTC C120B 2014 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 2014 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 2014 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 2014 Toyota RAV4 code?
Need more information on how to fix the C120B 2014 Toyota RAV4 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C120B 2014 Toyota RAV4 code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about C120B 2014 Toyota RAV4 Code
What does the OBDII code C120B mean on a 2014 Toyota RAV4?
The C120B code indicates "Ignition Supply Voltage Low," meaning the vehicle’s electronic control systems are receiving insufficient voltage from the ignition circuit.
What are common symptoms of code C120B on a 2014 Toyota RAV4?
Symptoms may include warning lights on the dashboard (such as ABS or traction control), intermittent electrical issues, or reduced performance of electronic systems.
What causes the C120B Ignition Supply Voltage Low code?
Common causes include a weak or failing battery, corroded or loose battery terminals, damaged wiring, or a malfunctioning ignition switch.
Can I still drive my 2014 Toyota RAV4 with code C120B?
You may be able to drive the vehicle, but it’s not recommended as low ignition voltage can lead to unpredictable behavior of critical systems like ABS and traction control.
How do I diagnose the C120B code on my Toyota RAV4?
Start by checking the battery voltage, inspecting battery terminals for corrosion, and visually inspecting wiring connections. Use a multimeter to test for voltage drops in the ignition circuit.
Does the C120B code affect the ABS system?
Yes, low ignition supply voltage can disrupt the ABS system’s operation, potentially reducing braking performance and stability.
How can I fix the C120B code on a 2014 Toyota RAV4?
Common fixes include replacing a weak battery, cleaning or tightening battery terminals, repairing damaged wiring, or replacing a faulty ignition switch.
Will clearing the C120B code solve the problem?
Clearing the code may temporarily remove the warning, but the underlying issue must be addressed to prevent the code from returning.
How much does it cost to fix code C120B on a 2014 Toyota RAV4?
Repair costs vary depending on the cause, ranging from $20 for cleaning battery terminals to $200 or more for replacing an ignition switch.
Can a low alternator output cause code C120B?
Yes, if the alternator is not providing sufficient voltage to the electrical system, it can trigger the C120B code.
Discuss the causes and fixes for C120B 2014 Toyota RAV4 OBDII Code
Code C120B 2014 Toyota RAV4 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
