P0120 Throttle/Pedal Position Sensor/Switch A Circuit Malfunction

P0120 points to a throttle or pedal position sensor/switch A circuit malfunction. The module sees an electrical fault or implausible signal in the throttle-position path.

Code status

Needs verification

Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.

System
Fuel / Air
Scope
iso-sae-controlled-p0
Standard
SAE J2012 / ISO 15031-6
Source
legacy-import

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not clean or replace the throttle body before checking redundant sensor correlation and wiring integrity.

Useful checks before replacing parts

Related OBD-II codes

These nearby fuel / air entries can help compare wording and fault area. They may share the same verification status as the source database.