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P0221 - OBD-II Trouble Code

Our automotive experts have put together the following information about the P0221 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0221 code.

What Does P0221 Code Mean?

Fault Code Definition

The Throttle Position Sensor/Switch is located on the Throttle Body of the Intake Manifold and the Pedal Position Sensor/Switch is located on the Accelerator Pedal. These sensors provide precise input from the driver's foot in terms of how much power is needed—and how urgently—from the engine.

As the Throttle Position Sensor is rotated from its base resting position to full acceleration, it sends a decreasing voltage signal to the Powertrain Control Module (PCM). This decreasing or increasing voltage signal is used by the PCM to manage the Air Fuel Ratio and Spark Timing of the engine as well as other emissions system components.

P0221 Symptoms

  • Check Engine Light will illuminate
  • In many cases, no abnormal symptoms may be noticed
  • In some cases, the engine may be hard starting
  • In some cases, the engine may hesitate during acceleration

Common Problems That Trigger the P0221 Code

  • Defective Throttle/Pedal Position Sensor or Switch
  • Dirty or carbon-filled Throttle Bore
  • Torn or jammed floor mats
  • Faulty or corroded Throttle/Pedal Position Sensor/Switch wiring or connections

Common Misdiagnoses

  • Throttle Position Sensor is replaced when the real problem is a dirty or carbon-filled Throttle Body
  • Throttle/Pedal Position Sensor is replaced when the real problem is a poor connection or chafed wiring
  • Pedal Position Sensor is replaced when the real problem is torn or damaged floor mats

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