P2621 - OBD Trouble Code

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The engine performance which is reduced is usually known as the throttle position output circuit low. You will find the throttle position sensor/ switch, situated on the throttle body of the intake manifold as well as the pedal position sensor/switch which comes as a component of the accelerator pedal assembly. The information as to how fast or quick the driver needs to go will be informed by the sensors to the ECM. If there is a problem in the sensor or the circuit, the P2621 error will be set by the PCM. The speed limit will be lessened to 20 miles per hour by the PCM so that the engine can be safeguarded and the driver due to the control module’s incapability to precisely find the engine performance as needed.

The signal of the throttle position circuit is carefully looked after by the engine control module. The error code will be set in the vehicle by the ECM if the factory specification is not met as desired.

What causes this problem with the Throttle Position Output Circuit Low?

• Defective throttle position sensor/switch.
• Throttle position sensor/switch harness might have an opening or short circuit.
• Throttle position sensor/switch circuit might have a weak electrical connection.

1. Powertrain Control Module - The engine will fail to start or the fuel economy will be poor if the powertrain control module is faulty. Get them replaced as soon as possible so that you can get rid of the P2621 error code
2. Throttle Position Sensor - Sudden jerking by your vehicle shows the failure of the throttle position sensor. Get rid of it immediately by replacing it with a new TPS from PartsAvatar.
3. Throttle Body - Blinking of the check engine light indicates that the throttle body is faulty. Repair it quickly to avoid further troubles.
4. Accelerator Pedal Assembly - Do you experience a sudden surge in speed while driving on the highway? Then it’s a high time you replace your accelerator pedal assembly as it can be defective.
5. Throttle Control Motor - Throttle control motor can be damaged if the engine refuses to start. Alter it as soon as possible.

After knowing all the cause behind the issues, let’s have a look at a few common symptoms of this problem. Read through this section to learn more about this error code P2621.

Common Symptoms

• Engine performance might be reduced.
• Fuel consumption might be more.
• Due to decreased performance, the engine might reach limp mode.

Fixing problems with your car is not as easy as it might seem. You need to be extremely careful and follow certain steps.

• You will have to replace the throttle position sensor in order to avoid this error code.

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If you want to easily diagnose this fault code P2621, then all you have to do is to follow the steps which are mentioned below:

• The PCM will receive a variable output voltage reading from the TPS which usually lies between 0.5 to 5.0 volts.
• This output signal will help the PCM to identify the degree to which the throttle body must open so that the desired RPM level can be reached.
• Modern throttle position sensors belong to the non-contact variety which comprises of the hall effect sensors, magnetoresistive style sensors, and inductive sensors.
• To diagnose this condition, you will need several tools.
• Diagnose the code with the help of a scanner and DVOM.
• A manufacturer’s service manual will be essential.
• Carefully check the wires and connectors.
• The damaged wires, connectors, and other components have to be separated and repaired.
• After each successful diagnosis, recheck the system. Attach a scanner to the vehicle if every component is in proper working conditions and then retrieve both the stored codes and freeze frame data.
• This is highly helpful to find if there are any irregular conditions which made this error code to get stored in the vehicle.
• Clear all codes and retest the vehicle to see if any error has occurred.
• This will help you to know if the condition was irregular. Clear all codes and retest the vehicle to see if an error appears again.
• The condition will be erratic if the code does not show up instantly.
• In one such situation, you have to worsen the condition of the vehicle before proceeding for further diagnosis as this is a challenging task.
• In order to check the output voltage of the throttle position sensor, you will have to check the readings of the signal voltage at the connector face as the throttle body is manually activated.
• Closely look for sudden jumps in voltage or glitches when the voltage drops.
• Adjusting the throttle position sensor is dangerous to proper operation if it is fixed with an adjustable sensor.
• Separate the connector from the throttle position sensor and its linked controllers if the TPS works well.
• Replace the open and shorted circuits as needed by performing a continuity and resistance test on all circuits.
• Each time a repair is done, double check the entire process to make sure it’s successful.
• The PCM can be faulty if all the system circuits and TPS prove to be within the accepted specifications.
• Failure of the PCM is very rare and if you replace them, you must reprogram them early.

Common Mistakes When Diagnosing the P2621 Code

• Faulty powertrain control module.
• Malfunctioning throttle control motor.
• Troublesome electrical wires.