OBD2 Error Code P0120: How to Fix It

Q: Can I drive with P0120 error code?

You should avoid driving with P0120 as it can cause unpredictable acceleration, stalling, and poor fuel economy. The vehicle may enter limp mode, limiting performance for safety.

Q: How much does it cost to fix P0120?

DIY repair typically costs $50-150 for a replacement throttle position sensor. Professional repair ranges from $150-400 including labor, depending on vehicle accessibility and local rates.

Q: What causes throttle position sensor failure?

Common causes include normal wear over time, exposure to engine heat and vibration, contamination from oil or dirt, wiring damage, and corrosion at electrical connections.

Q: How do I know if my TPS needs replacement?

Symptoms include rough idle, hesitation during acceleration, sudden surging, stalling, and the check engine light. An OBD2 scanner will confirm with codes P0120, P0121, P0122, or P0123.

Q: Can a bad TPS cause transmission problems?

Yes, since the transmission uses TPS signals for shift timing, a faulty sensor can cause harsh shifts, delayed engagement, or transmission staying in one gear.

Abstract

OBD2 error code P0120 indicates a malfunction in your vehicle's throttle position sensor (TPS) circuit. This sensor tells the engine control module how far the throttle is open, and when it fails, you may experience poor acceleration, rough idling, or stalling.