9 Symptoms Of A Bad Throttle Position Sensor You Never Knew

Bad Throttle Position Sensor Symptoms

A throttle position sensor is an important part of a car’s fuel injection system. It is responsible for providing information about the position of the throttle to the engine control unit. If the sensor is not working properly, it can cause a number of problems with the vehicle.

A bad throttle position sensor will send wrong data to ECU resulting in many problems. Knowing the bad throttle position sensor symptoms can help you quickly troubleshoot the problem. Fortunately, Below is a comprehensive guide about bad throttle position sensor symptoms.

In this powerful guide, you are going to learn the nine ridiculous symptoms of bad throttle position sensors explained in easy-to-understand language.

Related Post: What Is Throttle Position Sensor & Its Types

What Are The Symptoms Of A Bad Throttle Position Sensor

A throttle position sensor measures the position of the throttle valve placed on the throttle body. It senses the throttle valve movement and converts it into electronic signals. With time the sensor gives several different types of issues.

Now, how do you know if your throttle position sensor is bad? Just read on, and you will know if your throttle position sensor is bad. Below are the nine ridiculous symptoms of the bad throttle position sensor.

9 Signs Of A Bad Throttle Position Sensor

1. Weak Acceleration Response

Car Accelerates Slowly
Car Accelerates Slowly

This is a common bad throttle position sensor symptom. The problem occurs when the throttle position sensor loses its job and does not send the full data to the ECU. As a result, the car accelerator response becomes weak, and your car may not run efficiently as it used to.

2. Hesitation Or Jerking While Driving

Accelerator Pedal
Accelerator Pedal

Hesitation or jerking can be a symptom of a bad throttle position sensor. You will face the car’s hesitation or jerking while you are driving. A bad throttle position sensor will feed incorrect data to the ECU.

Therefore, the engine control unit (ECU) does not know how far the throttle valve should be open, which leads to hesitation or jerking of the car while driving.

Related Post: What Are The Symptoms Of A Bad Accelerator Pedal Sensor

3. The Car Will Not Pass A Certain Speed Limit

The Accelerator Will Not Exceed From A Limit
The Accelerator Will Not Exceed From A Limit

This is another symptom of a bad throttle position sensor where the car will not pass a certain speed limit. It is a confusing sign that your car may not run faster even if you have depressed the accelerator pedal fully.

A faulty throttle position sensor would not be able to send full data to ECU. As a result, the ECU will not fully open the throttle valve and the car may not pass a certain speed limit.

Related Post: Can You Bypass Throttle Position Sensor & Why You Shouldn’t

4. Car Speeds Up On Its Own

Speed
Speed

This is a dangerous symptom of a bad throttle body position sensor, where the car may speed up on its own without having the intention to speed the car up. It happens especially when you are driving and your car suddenly speeds up without stepping on your accelerator pedal. It can cause an accident.

A bad throttle position sensor will not manage to send its data at the right time to speed the car up conversely, the car suddenly speeds up at that time when you are not intending to speed the car up.

5. Lacks Engine Power

Engine
Engine

This is another sign of a bad throttle position sensor where your car will lack engine power. It is because when the throttle position sensor fails, it will switch your car into a safe mood, which reduces heavy acceleration and speed, resulting in a lack of engine power.

Related Post: Can A Bad Knock Sensor Damage The Engine?

6. Unstable Idle

Tachometer Showing An Idling Engine
Tachometer Showing An Idling Engine

When your car idle surges or the engine does not maintain a steady idle is a symptom of a bad throttle pedal position sensor. A bad throttle pedal position sensor will give random information to the ECU causing variant idle speed, and sometimes the car stalls suddenly.

7. Gear Shift Problem

Gear Shift Lever
Gear Shift Lever

This is a less common problem that happens due to the bad throttle position sensors. The bad throttle position sensor will deliver wrong information to the ECU resulting in variant acceleration, which finally leads to gearshifting problems. Your car may upshift or downshift earlier or later.

8. Affects Fuel Economy

Low Fuel
Low Fuel

This is also a common symptom of a bad throttle position sensor. A bad throttle position sensor will lead to increased fuel consumption. The defective throttle position sensor will send the wrong information to ECU.

This miscalculates information and leads to injecting a high amount of fuel into the engine resulting in increased fuel consumption.

9. Check Engine Light Comes ON

Engine Check Light
Engine Check Light

A bad throttle position sensor leads to show up a check engine light. Once the ECU detects a problem in the throttle position sensor, it shows up a check engine warning light or Intermittent flashing of the check light without any obvious reason on the instrument panel. A diagnostic device can determine the exact problem.

Related Post: Accelerator Pedal Position Sensor

Pro Tip

The above are the symptoms of a bad throttle position sensor. But, before taking the final decision to replace the bad throttle position sensor, you should consider the below point.

It is not necessary that the car throttle position sensor must be defective to show up these signs. Sometimes, a loose or corroded connector or a cut in the wire also causes these issues, so be careful before replacing the throttle position sensor.


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