C120B 2017 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 2017 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 2017 Toyota RAV4 Description
What are the Possible Causes of the DTC C120B 2017 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 2017 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 2017 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 2017 Toyota RAV4 code?
Need more information on how to fix the C120B 2017 Toyota RAV4 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C120B 2017 Toyota RAV4 code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about C120B 2017 Toyota RAV4 Code
1. What does the OBDII code C120B mean on a 2017 Toyota RAV4?
The C120B code indicates "Ignition Supply Voltage Low," meaning the ignition system is receiving insufficient voltage, which can affect vehicle performance.
2. What are the common symptoms of code C120B in a 2017 Toyota RAV4?
Symptoms may include warning lights on the dashboard, difficulty starting the vehicle, or erratic electrical system behavior.
3. What causes the C120B code in a 2017 Toyota RAV4?
Common causes include a weak or failing battery, loose or corroded battery terminals, a faulty ignition switch, or wiring issues in the ignition circuit.
4. Can a low battery trigger the C120B code on a 2017 Toyota RAV4?
Yes, a dying or undercharged battery is a frequent cause of the C120B code because it can lead to insufficient ignition supply voltage.
5. How can I fix the C120B code on a 2017 Toyota RAV4?
Start by checking the battery voltage and condition, inspecting battery terminals for corrosion or looseness, and verifying the integrity of wiring and connectors in the ignition circuit.
6. Is the C120B code dangerous to drive with?
While it may not immediately disable your vehicle, driving with this code can lead to further electrical issues and unreliable performance, so it should be addressed promptly.
7. How do I diagnose the C120B code on a 2017 Toyota RAV4?
Use an OBDII scanner to confirm the code, then check the battery voltage, inspect the ignition circuit wiring, and test the ignition switch for proper operation.
8. Can a faulty alternator cause the C120B code?
Yes, a malfunctioning alternator can lead to insufficient voltage being supplied to the ignition system, potentially triggering this code.
9. Will clearing the C120B code fix the issue on a 2017 Toyota RAV4?
Clearing the code may temporarily remove the warning, but if the underlying issue isn’t resolved, the code will likely return.
10. When should I seek professional help for the C120B code on a 2017 Toyota RAV4?
If you’ve checked the battery, terminals, and wiring but the code persists, it’s best to consult a qualified mechanic for further diagnostics and repairs.
Discuss the causes and fixes for C120B 2017 Toyota RAV4 OBDII Code
Code C120B 2017 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.
