• Check Engine Light is on
• Poor engine performance
• Hesitation or stalling during acceleration
• Faulty throttle position sensor
• Wiring issues or poor electrical connections
• Faulty ECM
Throttle Position Sensor (TPS): A sensor that monitors the position of the throttle in the engine.
Engine Control Module (ECM): The computer that manages engine functions in modern vehicles.
• P0121
• P0122
Throttle/Pedal Position Sensor/Switch A Circuit
This code means there is a problem with the sensor that tells the car's computer how much you are pressing the gas pedal.
The P0120 code indicates that the engine control module (ECM) has detected a problem with the voltage signal from the throttle position sensor (TPS) or pedal position sensor (PPS) circuit 'A'.
The throttle position sensor is responsible for monitoring the position of the throttle in the engine. It sends a signal to the ECM to indicate how much the throttle is open, which helps the ECM determine the appropriate air-fuel mixture for the engine. If the ECM detects an out-of-range or inconsistent signal from the TPS, it triggers the P0120 code.
• Use an OBD-II scanner to confirm the P0120 code.
• Inspect the throttle position sensor and its wiring for damage.
• Test the voltage and ground signals at the TPS connector.
• Replace the throttle position sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Screwdriver set
$100 - $300
Moderate
• Toyota Camry
• Ford F-150
• Honda Accord
• Regularly inspect and clean throttle body and sensors.
• Ensure proper maintenance of electrical connections.
• Use quality replacement parts.
Sensor Issue
• Avoid driving aggressively until the issue is resolved.
• Consult a professional mechanic for accurate diagnosis.
Check vehicle warranty coverage for sensors and electrical components.
This code has been common in vehicles with electronic throttle control systems since the late 1990s.
Moderate – The vehicle may still be drivable, but performance issues should be addressed soon to avoid further damage.
Driving with a faulty TPS can lead to unsafe driving conditions. It is recommended to address this issue promptly.
• Engine running
• Throttle position sensor connected
The throttle position sensor is typically located on the throttle body of the engine.
Q: Can I drive with a P0120 code?
A: While you may be able to drive, it's not recommended due to potential performance issues and safety concerns.
Q: How do I reset the P0120 code?
A: After fixing the issue, you can reset the code with an OBD-II scanner or by disconnecting the battery for a few minutes.
