Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance

What it means

The engine computer compares the signal from throttle or pedal position sensor A with the value expected from other sensors, such as the MAF, MAP or the second position sensor. When the reading does not match or jumps illogically, it sets this code, and the car may enter limp mode.

Related codes: P0120P0122P0123P2135P0101P0106

Symptoms5

• Check engine light on.
• Hesitation or jerking when pressing the accelerator.
• Unstable idle.
• Occasional limp mode with reduced power.
• Erratic shifting in an automatic transmission.

Possible causes6

• Worn spot on the sensing track inside the sensor, making the signal jump.
• Carbon buildup in the throttle body changing its idle position from what is expected.
• Extra resistance in the connector or wiring from corrosion.
• Failed electronic throttle body or its motor.
• Fault in the sensor it is compared with, such as the MAF or MAP sensor.
• Large air leak making airflow disagree with throttle position (less common).

How to diagnose5

1. Watch the sensor signal on a scan tool while slowly opening the throttle from closed to fully open, looking for any jump or dropout.
2. Inspect the throttle body for carbon buildup.
3. Inspect the connector for corrosion or loose pins.
4. Compare the sensor reading with the second position sensor and the MAF or MAP readings.
5. Read other codes; MAF or MAP codes mean the fault may lie there.

How to fix5

1. Clean carbon from the throttle body with a dedicated cleaner.
2. Clean or replace the connector.
3. Fix any MAF or MAP sensor fault found.
4. Replace the sensor, or the throttle body if the sensor is built in.
5. Run the throttle relearn procedure if the vehicle requires it, then clear the codes and road test.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

The fix is often a low-cost throttle body or connector cleaning; the cost reaches the upper end when the electronic throttle body is replaced.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions