P0124 Throttle/Pedal Position Sensor/Switch A Circuit Intermittent

P0124 indicates an intermittent throttle or pedal position sensor/switch A circuit fault. The signal becomes unstable or implausible only under some conditions.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

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 adjust throttle stops or relearn repeatedly before checking the intermittent electrical signal.

Symptoms of P0124

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0124

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Graph throttle or pedal sensor A against redundant channels while slowly moving the pedal and throttle.
Inspect connector fit, terminal tension, reference voltage, sensor ground, and harness routing near the throttle body or pedal.
Watch for signal dropouts or spikes during vibration, heat, or harness movement.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.