What does fault code P0120 mean?

Throttle Position (TP) Sensor/Pedal Position Sensor A Circuit. The throttle position sensor signal voltage is outside the range expected by the ECM.

P0120

Throttle Position (TP) Sensor/Pedal Position Sensor A Circuit

Q: What are the possible causes of P0120?

TP sensor failure; Sensor power or ground poor; Sensor signal wire abnormal; Throttle body dirty causing sticking; ECM fault.

Severity: Medium Fuel & Air Metering Generic Code

Detailed Description

The throttle position sensor signal voltage is outside the range expected by the ECM.

Possible Causes

TP sensor failure

Sensor power or ground poor

Sensor signal wire abnormal

Throttle body dirty causing sticking

ECM fault.

Solutions & Repair Guide

Measure TP sensor output voltage (approximately 0.5-1.0V at idle, 4.0-4.5V at WOT); Check sensor connector; Clean the throttle body; Check throttle cable or electronic throttle motor for proper operation.

Disclaimer: The information above is for reference only and does not constitute professional repair advice. Actual causes may vary depending on vehicle make, model, year, and configuration. Always consult a qualified technician for accurate diagnosis.