Question 1

What does P0120 mean?

Accepted Answer

P0120 - Throttle Position Sensor (TPS) Circuit Malfunction. The TPS signal is out of expected range.

Question 2

What are the symptoms of P0120?

Accepted Answer

Check engine light, Erratic idle, Hesitation, Stalling, Reduced power mode

Question 3

What causes P0120?

Accepted Answer

Failed TPS sensor, Worn throttle body, Wiring issue, Corroded connector, Carbon buildup on throttle plate

Question 4

How much does it cost to fix P0120?

Accepted Answer

Typical repair cost: $50-$400. On electronic throttle body vehicles, TPS is built-in. Try cleaning the throttle body first.

P0120 — Throttle Position Sensor (TPS) Circuit Malfunction

Don't guess — diagnose P0120 the right way