What is P0120 Fault-Error Code?
The P0120 Fault-Error Code indicates a malfunction in the vehicle's TP (Throttle Position) sensor A circuit. This sensor detects the throttle position and reports it to the engine control unit (ECU).
When the throttle is opened or closed, the TP sensor monitors this movement and sends the necessary signals to the ECU to set the correct drive rate.
What are the symptoms of P0120 Fault/Error Code?
Symptoms of fault/error code P0120 may include:
Erratic Engine Operation: A malfunction in the TP sensor may cause the engine to operate erratically. Unwanted vibration or fluctuation of the engine may occur, especially when the accelerator pedal is used.
Loss of Power: A malfunction in the TP sensor can cause the engine to lose power. The vehicle's ability to accelerate may decrease and it may feel unresponsive.
Delay in Throttle Response: A delay or slowdown in the vehicle's throttle response may be observed. When the accelerator pedal is pressed, the vehicle may react later or slower than normal.
Check Engine Light: TP sensor malfunctions can be detected by the vehicle's engine control unit and cause the Check Engine light to come on. The fault light notifies the driver that there is an engine problem.
Problems in Gear Shifting: A malfunction in the TP sensor may cause problems in shifting gears in the vehicle. Especially in vehicles with automatic transmission, sudden or unsmooth gear changes may occur.
Problems with Cruise Control or Traction Control Systems: A malfunction in the TP sensor may prevent the cruise control or traction control systems from operating properly. The effectiveness of these systems may decrease or be completely disabled.
What could be the causes of P0120 Fault/Error Code?
There are several possible causes for a P0120 fault/error code:
Defective TP Sensor: The TP sensor detects the throttle position and transmits this information to the engine control unit, which adjusts fuel injection and engine performance. Wear, damage or malfunctions in the sensor itself can cause error P0120 to occur.
TP Sensor Connection Problems: Electrical connections to the TP sensor may be loose, corroded, or damaged. These connection problems can cause the sensor to fail to transmit the correct signals and cause an error code to occur.
Electrical Problems in the TP Sensor Circuit: Shorts, open circuits, or electrical problems in the TP sensor circuit can prevent the sensor from functioning properly and trigger the P0120 error.
Cable Problems to the TP Sensor: The cables to the TP sensor may be damaged, broken or broken. This may cause the sensor to not transmit its signal correctly and cause an error code to occur.
Engine Control Unit (ECU) Problems: The engine control unit processes signals from the TP sensor and regulates engine performance. If there is a malfunction in the ECU or it is not processing TP sensor signals correctly, error P0120 may occur.
What Steps Should Be Followed to Resolve the P0120 Fault/Error Code?
You can follow the steps below to solve the P0120 fault/error code:
Reading the Fault Code: As a first step, use an OBD-II scanner to read the vehicle's fault code and verify the fault in the TP (Throttle Position) sensor A circuit.
Checking TP Sensor: Check the TP sensor and replace if necessary. Inspect the physical condition and connections of the sensor. Check if the sensor may be dirty, worn or damaged.
Check Electrical Connections: Check the electrical connections to the TP sensor. Make sure the connections are secure, with no corrosion or loose connections. Clear or reconnect connections if necessary.
Testing the TP Sensor Circuit: Test the electrical values in the TP sensor circuit. If the circuit has shorts, open circuits, or other electrical problems, troubleshoot these problems.
Calibration of TP Sensor: If a new TP sensor is installed or any adjustments are to be made to the existing sensor, calibrate the sensor. This ensures that the sensor sends the correct signals.
Engine Control Unit (ECU) Check: If there is a fault in the ECU or the ECU is not processing TP sensor signals correctly, check or reprogram the ECU.
System Testing and Reset: Once all repairs are done, take the vehicle for a test drive and check if the error code is still present.
These steps are the basic steps usually followed to solve the P0120 fault/error code. However, since every vehicle and situation is different, it is important to contact the vehicle service or a specialized technician for a complete diagnosis and repair.
What are the Long-Term Effects of the P0120 Fault/Error Code?
Long-term effects of fault/error code P0120 may include:
Decrease in Engine Performance: TP (Throttle Position) sensor controls the engine's air-fuel mixture and throttle opening. Therefore, a malfunction in the sensor can affect the performance of the engine. Problems such as engine loss of power or irregular operation may occur.
Reduced Fuel Economy: A malfunction in the TP sensor can cause the engine to be unable to properly control fuel injection and throttle opening. This can lead to increased fuel consumption and lower fuel economy.
Emission Increase: The TP sensor also affects the engine's emissions. A fault in the sensor can cause the engine to fail to achieve the correct fuel air mixture, which can lead to increased emissions levels.
Problems in Other Systems: Failure of the TP sensor can also affect other systems in the vehicle. Especially in vehicles with automatic transmission, problems may occur with systems such as gear shifting or traction control system.
Long-Term Engine Damage: A long-term failure of the TP sensor can cause the engine to run erratically and cause the air-fuel mixture to become unbalanced. This may cause engine overheating, cylinder wear, or damage to other engine components.
It is important that the P0120 fault/error code is not ignored and resolved as soon as possible. If the fault persists for a long time, it may negatively affect the performance and reliability of the vehicle and lead to more serious problems such as engine damage. Therefore, it is important to identify the error code and repair or replace the TP sensor if necessary.
What is Throttle Position Sensor? You can reach our article.
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