P2120 to P2134 and related codes: pedal and throttle position sensors and their end stops

What does P2120 mean?

The accelerator pedal carries two or more position sensors, and the throttle body two more, so the computer can compare them and catch a fault. Letters D, E and F are usually the pedal's sensors, and the minimum and maximum stop codes say a sensor did not return to its rest position or did not reach full travel as learned. P2299 is a safety check: if the brake is pressed while the accelerator is held down, the computer cuts the engine power so the brake can stop the car.

What causes P2120?

1. A worn accelerator pedal sensor, which is usually part of the pedal assembly
2. A floor mat or an object under the pedal stopping it from returning or reaching full travel
3. A damaged wire or connector at the pedal or the throttle body
4. Resting a foot on the brake while accelerating, for P2299
5. A pedal or throttle replaced without the end positions being relearned

What to check first for P2120

• Check that nothing, a floor mat above all, is under or behind the accelerator pedal
• Watch both pedal sensor signals on a scan tool while pressing the pedal slowly from rest to the floor
• Inspect the pedal connector for corrosion and loose pins
• Have the pedal and throttle end positions relearned after a replacement

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