The lightning bolt symbol in a car indicates an electronic throttle control warning light. When the system detects an issue with ETC, this lightning bolt symbol on the dashboard comes on.
In older cars, there is a mechanical linkage between the accelerator pedal and the throttle body. However, over time, the mechanical linkage is replaced by sensors and actuators. All modern vehicles (model year 1990 or newer) now have electronic throttle control systems.
What Does The Lightning Bolt Symbol In Car Mean?
As we mentioned earlier, the lightning bolt symbol on a car dashboard is the electronic throttle control warning light.
When the system detects an issue with ETC, it starts blinking the lightning bolt warning symbol on the dashboard. because of a faulty accelerator pedal position sensor, a faulty throttle control sensor, a stuck or broken throttle body, or a wiring problem.
To gain a better understanding of the lightning bolt symbol in a car, first learn about electronic throttle control (ETC) and how it works.
What Is Electronic Throttle Control System?
The ETC is a system integrated with your vehicle’s master computer, the engine control unit (ECU), also known as the engine control module (ECM). The electronic throttle control consists of the accelerator pedal module and an electronic throttle body (air control valve, or ACV) on the engine and the electronic fuel injector (EFI) also controlled by ETC.
When you press the gas pedal at that point, the vehicle’s ECM signals the throttle body (ACV) for airflow, and the EFI increases or decreases the fuel flow with respect to the gas pedal position, and you will get acceleration.
What Does the Lighting Bolt Symbol In Car Look Like?
The lightning bolt symbol on a car looks like a short vertical lightning bolt suspended between two curving lines.
What Causes A Lightning Bolt Warning Symbol?
A dirty throttle body stuck, a faulty throttle accelerator pedal position sensor, a faulty throttle control sensor, or a wiring issue are the most common causes of the lightning bolt warning light.
1. Faulty Throttle Control Sensor
When you press the gas pedal, the vehicle’s ECM tells the throttle body to open, adjusting the air-to-fuel ratio according to the position of the accelerator pedal. The ECM relies on the throttle body position sensor, which gives information to the ECM about how far the throttle body opens or closes.
If there is a problem with the throttle control sensor, it could not get an exact reading of the throttle position. When the system detects a problem with the sensor, the car’s lightning bolt symbol illuminates.
2. Faulty Accelerator Pedal Position Sensor
The accelerator pedal position sensor tells the vehicle’s ECM the exact position of the pedal. When you press the pedal, the ECM sends a message to the throttle to adjust its position according to the accelerator pedal to get a proper air-to-fuel ratio so that the vehicle can accelerate.
When the accelerator pedal position sensor goes bad, the vehicle’s ECM has no idea about the pedal position. and everything doesn’t come back the way you expect. The vehicle system illuminates the lightning bolt warning light, also known as the ETC light.
3. Stuck Throttle Body
Even if the electrical system and all other parts of the ETC system work perfectly fine, the throttle body may be stuck because of carbon buildup or for any other reason, causing the light bolt symbol in the car dashboard to illuminate.
How To Reset Lightning Bolt Symbol In Car
To reset the lightning bolt symbol in car, you must use an OBD2 scanner. However, in most cases, you cannot reset the lightning bolt warnig ligth by just erasing the faulty code memory. You need to fix the problem that caused the light to come on.
Is It Safe To Drive With Lightning Bolt Symbol In Car?
It is not safe to drive with lightning bolt symbol in car. Because for any reason a faulty throttle control sensor, a faulty accelerator pedal position sensor, or a faulty throttle body. the vehicle ECM can’t keep accurate tabs on how much air enters the engine. which can lead to an out-of-control engine.
This affects fuel efficiency and causes a drop in acceleration. and if you do not address the underlying cause of your lightning bolt symbol in car. It can lead to premature engine wear over time because the air-to-fuel ratio is not what it should be.
Conclusion: Lightning Bolt Symbol In Car
When the system detects an issue with ETC, it starts blinking the lightning bolt warning symbol on the dashboard. The ETC system includes the accelerator pedal, throttle body, and all the parts in between. The ETC warning light is illuminated for several reasons:
- Faulty throttle control sensor
- Faulty accelerator pedal position sensor
- Stuck or Broken throttle body
- Wiring issues
When you see the lightning bolt symbol in car illuminate, the first thing you should do is read trouble codes with an OBD2 scanning tool. Most of the time, the scanner will tell you what the exact problem is.
Sources:
Federal Motor Vehicle Safety Standards; Accelerator Control System
Practical Solution for Automotive Electronic Throttle Control Based on FPGA
Resetting The Throttle Body Calibration (this step is conditional)