P0120 Fault Code

Throttle Pedal Position Sensor/Switch A Circuit Malfunction

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0120 fault code indicates a malfunction in the Throttle Pedal Position (TPP) Sensor or Switch A circuit. This code is generally triggered when the engine control unit (ECU) detects an issue with the signal from the TPP sensor, which is responsible for indicating the position of the throttle pedal to the engine management system.

What are the symptoms of the P0120 code?

• Check engine light illuminated on the dashboard
• Poor acceleration and performance issues
• Erratic engine behavior, such as stalling or surging
• Increased fuel consumption
• Difficulty in maintaining speed while driving

What causes the P0120 code?

• Worn or damaged throttle pedal position sensor
• Poor electrical connections or wiring issues in the sensor circuit
• Faulty engine control unit (ECU)
• Accumulated dirt or debris affecting sensor function
• Related mechanical issues with the throttle body that may impact the sensor's readings

How to fix P0120?

• Inspect the throttle pedal position sensor for any signs of damage or wear
• Check the electrical connections and wiring for corrosion or loose connections
• Test the sensor with a multimeter to ensure it is functioning correctly
• Replace the throttle pedal position sensor if it is found to be defective
• Reprogram or replace the ECU if it is determined to be faulty
• Clean the throttle body to ensure proper operation