OBD-II diagnostic trouble code
P0120Caution

Throttle/Pedal Position Sensor A Circuit Malfunction

The main throttle or accelerator pedal position sensor circuit has failed, which can cause the engine to lose power or enter a protective limp mode until it's repaired.

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Code names are compiled from open/standardized SAE and ISO references. Explanations, symptoms, causes and fixes are original. Covers generic (P0/C0/B0/U0) codes only — manufacturer-specific codes are planned for a future update.

Frequently asked questions

Can I drive with P0120?

You can usually keep driving with P0120, but don't put it off — the underlying cause can get worse or lead to further damage the longer it goes unaddressed. Get it diagnosed as soon as you reasonably can.

How much does it cost to fix P0120?

The cost varies too much by cause and vehicle to give a single figure here — a diagnosis will narrow it down.

What causes P0120?

AS
Reviewed by Artyom SemenovAutomotive Editor · Fact-checked by Yauheni Kapliarchuk, Editor-in-Chief
Code names compiled from open SAE/ISO references; explanations and repair guidance are original editorial content
Last verified: 09 Jul 2026 · Our methodology