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P0221 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


The throttle/pedal position sensor/switch “B” circuit may have a problem, according to the P0221 Diagnostic Trouble Code (DTC), an OBD-II (On-Board Diagnostics II) code. The throttle position sensor (TPS), which is frequently present in both gasoline and diesel engines, is especially mentioned.


When your vehicle’s onboard computer detects an anomaly in the throttle/pedal position sensor/switch “B” circuit, it triggers the P0221 code. This usually happens when the TPS broadcasts an incompatible or abnormal signal to the engine control module (ECM), which causes a loss of vehicle performance.


The P0221 DTC code may result from a number of sources, including:

  • Faulty Throttle Position Sensor (TPS): The most common cause of P0221 is a malfunctioning TPS, which can send incorrect signals or fail to send any signals to the ECM.
  • Electrical Problems: The code may also be caused by corroded terminals, loose connections, or damaged wiring in the TPS circuit.
  • ECM Issues: In a small percentage of situations, the engine control module may malfunction and interpret the TPS signals incorrectly, resulting in the P0221 code.
  • Throttle Body Malfunction: A blocked or broken throttle body might prevent the TPS from working properly and set off the code.


When the P0221 code is present, drivers may suffer a number of distinct symptoms, including

  • Check Engine Light On: Typically, the Check Engine Light on a car’s dashboard will illuminate first to indicate a problem.
  • Decreased Engine Performance: The engine may accelerate slowly or react slowly to throttle commands.
  • Rough Idling: The engine might tremble or display erroneous idling.
  • Stalling: In extreme circumstances, the engine may stall when slowing down or performing maneuvers.


To accurately diagnose the P0221 code, a qualified mechanic will follow these steps:

  • OBD-II Scanner: To get the particular fault code from the vehicle’s ECM, the mechanic will utilize a diagnostic OBD-II scanner.
  • Visual Inspection: The throttle position sensor and related components will be thoroughly visually inspected to look for any broken wiring, loose connections, or obvious problems.
  • TPS Testing: The technician will test the TPS using a multimeter to make sure it is producing the right voltage and signal output and to see whether it is working properly.
  • Inspection of the Throttle Body: The throttle body will be examined for any blockages or damage that could be impairing TPS performance.
  • ECM Testing: In extremely rare circumstances, the ECM may need testing to obviate any intrinsic flaws.

Common mistakes

Some frequent errors made while diagnosing and fixing the P0221 code are as follows:

  • Ignoring Wiring Inspection: Technicians may undervalue the significance of carefully evaluating the wiring and connectors, which might result in problems that aren’t fixed.
  • Replacement of Components Without Thorough Testing: Replacing components without first doing thorough testing might lead to needless costs and may not address the underlying problem.
  • Ignoring Related Codes: P0221 occasionally comes with other related codes. To guarantee a thorough repair, it is essential to handle every code.

How serious is this?

Due to the fact that P0221 may have an effect on engine performance and could present a potential safety risk, this code should not be disregarded. Although it is not possible to cause rapid breakdowns, the underlying problems should be resolved as quickly as possible in order to avoid further losses and costly repairs.

What repairs can fix the code?

repair manuals

The following fixes can remove the P0221 error code in accordance with the diagnosis:

  • Replacement of the Throttle Position Sensor: If the TPS is broken, a fresh, dependable device must be installed in its stead.
  • Maintenance or Cleaning Wiring/Connectors: To guarantee effective sensor performance, any broken wiring or sloppy connections must be fixed or cleaned.
  • Throttle Body Repair or Replacement: The throttle body may need to be fixed or replaced if it is broken or jammed.
  • ECM Replacement: The ECM will need to be replaced or reprogrammed in the few instances where it is found to be at fault.

Related codes

Other related codes that may be associated with P0221 include P0220, P0222, P0223, and P2135. These codes often relate to the throttle position sensor and circuit issues.


Owners of vehicles may find the P0221 DTC code to be a troublesome problem since it impacts driving and engine performance. However, it can be successfully handled with a correct diagnosis and prompt fixes. It is advised to seek the advice of a trained mechanic to diagnose and fix the issue right away, ensuring that your vehicle operates smoothly and effectively if you experience the P0221 code or any similar symptoms.

Ignoring the code might eventually result in more serious problems that would affect both the performance of your automobile and your safety while driving.

P0221 Code – What Does It Mean & How To Fix It