Fault codeP0124

Throttle/Pedal Position Sensor/Switch A Circuit Intermittent

What this code means

Throttle/Pedal Position Sensor/Switch A Circuit Intermittent.

P0124 is a generic code: it means the same thing on every make. P0124 belongs to family P01xx — Fuel and air metering. Its page explains how to read a code and groups all its codes by part.

Type of fault

The signal drops out or jumps from time to time. This is typical of a poor contact: a loose or corroded connector, or a chafed wire that touches intermittently, often triggered by vibration or heat. The fault may disappear and come back; checking the wiring with the engine running is often revealing.

Throttle and accelerator pedal position sensors

On modern cars there is no cable between the pedal and the engine: sensors in the accelerator pedal tell the control unit how far you press, and an electric motor opens the throttle, whose position is measured by two more sensors. Each position is measured twice for safety, and both signals must agree.

What you notice

The engine often goes into limp mode: idle speed or very limited power, the accelerator barely responding. Sometimes jerks or idle speed surges.

How to check it

Check the connectors on the pedal and on the throttle body. A dirty throttle body can disturb the readings: cleaning it, then a relearn procedure, fixes some cases. Klaro shows the throttle and pedal positions; pressing the pedal slowly, they should rise smoothly without jumps.

Watch it live in Klaro

With an OBD2 adapter plugged in, these live readings show the part at work, when your car reports them:

• Throttle position
• Relative throttle position
• Absolute throttle position B
• Accelerator pedal position D
• Accelerator pedal position E
• Commanded throttle actuator

What to do

Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.

How to read this code

• PPowertrain
• 0standardised code
• 1Fuel and air metering
• 24P0124

Other codes for the same part

• P0120Throttle Pedal Position Sensor/Switch A Circuit Malfunction
• P0121Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem
• P0122Throttle/Pedal Position Sensor/Switch A Circuit Low Input
• P0123Throttle/Pedal Position Sensor/Switch A Circuit High Input
• P0220Throttle/Pedal Position Sensor/Switch B Circuit Malfunction
• P0221Throttle/pedal Position Sensor/Switch B Circuit Range/Performance Problem
• P0222Throttle/pedal Position Sensor/Switch B Circuit Low Input
• P0223Throttle/Pedal Position Sensor/Switch B Circuit High Input
• P0224Throttle/Pedal Position Sensor/Switch B Circuit Intermittent
• P0225Throttle/Pedal Position Sensor/Switch C Circuit Malfunction
• P0226Throttle/Pedal Position Sensor/Switch C Circuit Range/Performance Problem
• P0227Throttle/Pedal Position Sensor/Switch C Circuit Low Input