Why Is My Check Engine Light And TRAC Off Light On?

If you reading this post, it simply means you want to learn about, why is my check engine light and TRAC off light on.

Also covered in this thoughtful post are the following questions: Does traction control make your car shake? Does traction control have anything to do with transmission? Does traction control reduce engineer power, Does traction control affect speed?

Your largest advantage so far has been using this material for study.

Let’s quickly get into it.

Why Is My Check Engine Light And TRAC Off Light On?

When the TRAC and check engine lights are on at the same time, it simply means one or more of its systems is malfunctioning.

The “brain” that manages the entire system is the traction control computer in your car. This computer’s fault, corroded contacts, or water damage might cause the system to go down, activating the TCS warning light. This may also impact your ABS and turn on that light because the TCS and ABS frequently share a computer.

While this light is on, it’s likely that “Traction Control” won’t function. The “skidding vehicle” or “TRAC OFF” light might also be on some cars.


In a word, traction control aids drivers in keeping their vehicles under control when the road is slick. At the most fundamental level, when it notices that one of the driven wheels is slipping.

It’s also possible that the controller, the car’s speed sensor, or the wheel speed sensors need to be fixed.

Why Is My Engine Light And TRAC light On

These lights may turn on for a variety of causes, but they often fall into one of three groups.

1. Bad Wheel Speed Sensors.

 The most frequent cause of these lights turning on is faulty wheel speed sensors. Your vehicle’s other systems may experience issues if one or more of your wheel speed sensors aren’t working properly.

2.  Bad Steering Speed Sensor.

The main computer may determine where your car should drive based on how much you turn the steering wheel by sending information from the bad steering angle sensor, which monitors the amount your wheels turn from left to right. The traction control system as well as other areas of driving performance may suffer if this sensor stops functioning properly.

3. Bad Road Condition.

Even though this isn’t a problem with your automobile specifically, poor road conditions can be one of the main causes of these lights on your dashboard. When potholes or bumps are covered in snow or ice, they may cause some wiring underneath the bodywork of your automobile to be damaged, which would cause these lights to turn on as you drive over them.

4. Bad Coil Ignition.

In order to ignite the fuel in your engine, an electric current is produced by the ignition coil in conjunction with the spark plugs. The engine won’t start if it fails. If the coil malfunctions, it ought to be changed.

5. Loose Or Broken Gas Cap.

A gas cap that is too loose or broken can result in misfires, subpar performance, and even total engine failure if left unattended. Fuel vapors could seep from the tank into the engine compartment due to a damaged gas cap, which would be problematic for combustion.

Does Traction Control Make Your Car Shake?

 Modern vehicles with traction control can avoid dangerous collisions by reducing slippage brought on by traction loss. Although this safety system has proven effective in its intended function, it can also be connected to several issues with your car, raising many concerns.

Can traction control, for instance, result in a shake?

Yes, to answer briefly. Traction control is most likely to blame if the car is shuddering and you have the traction control light on. When the wheel speed sensor is malfunctions, this safety feature frequently behaves in this way.

First off, the wheel speed sensor (WSS) is a sensor that determines how quickly a car’s wheels rotate. This knowledge is crucial for additional unique safety elements that cooperate with traction control.

Think about the electronic stabilization program (ESP) and vehicle dynamic control system (VDC) as well as anti-lock brakes (ABS) (VDC).

The traction control system may send incorrect signals, which in turn causes the car to shake when it attempts to fix a problem based on those indications. If there are erroneous or missing wheel speed indications from a malfunctioning wheel speed sensor, the anti-lock braking system may also experience this. Consider contacting a qualified mechanic, such as one from Your Mechanic, who can come out, examine your slip warning worry, read the fault codes, and provide a more individualized diagnosis.

Does Traction Have Anything To Do With Transmission?

No, it has nothing to do with the transmission. Electronic traction control, which relies on ABS system sensors, is a feature of contemporary vehicles. Sensors are often used to control this, such as wheel sensors, transmission speed sensors, ABS differential, and gear sensors for rear-wheel drive cars.

Transmission and traction control are unrelated concepts. Since the late 1990s, traction control has been a standard feature in vehicles, even those with manual transmissions. In addition to stopping the throttle, it can also transfer power to the opposing side wheel by activating the anti-lock brake of a rotating wheel. If the vehicle has all-wheel drive, it can do the same with the front or back wheels.

This type of traction control was reportedly developed by Bosch in the late 1990s, and it has been a feature of nearly all European vehicles since the early 2000s. Volkswagen, Audi, BMW, Porsche, Volvo, Mercedes, and other brands employ Bosch or Siemens ABS modules in conjunction with Bosch Siemens.

Does Traction Control Affect Speed?

Yes, it does, but most likely, when a tire spins too quickly, the traction control system kicks in and immediately reduces speed. This facilitates your car to regain traction.

And also, the car’s weight pushes the tires against the road’s surface, creating traction. To stop, slow down, accelerate, and change directions, traction is required, as was previously mentioned. Your wheels could skid on the pavement if you don’t have traction.

The system is set up so that if the light illuminates, you are losing traction, and it lowers your throttle to 25% since, due to the loss of grip at one of the wheels, it necessitates the application of the brake to prevent it from spinning. The maker does not want you to harm the rotor, brake pad, or calliper due to the high-speed rotation of these parts. The issue is that the vehicle may struggle in some circumstances due to power loss due to the loss of traction.

Does Traction Control Reduced Engine Power?

Yes, it does reduced engine power because the vehicle’s traction control system is related to the Stability Track light. The computer will frequently put the car into a reduced power phase when it notices a problem with this system to stop additional harm and protect the occupants.


The two signs on your car’s dashboard are the TRAC off and the check engine light. These two problems must be resolved as soon as possible to avoid more trouble. Fixing these indications is essential to maintain your car trouble-free because problems could arise if you neglect them for an extended time.

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