How to remove the speed limiter on Mercedes Benz?
This blog will answer the following questions: how to remove the speed limiter on Mercedes Benz cars? What are the different types of speed limiters on Mercedes Benz? Can you remove the speed limit warning in the instrument cluster?
How to remove the speed limiter on Mercedes Benz?
To remove the speed limiter on Mercedes Benz, follow the steps given below:
- Unlock the vehicle and insert the key into the ignition switch.
- Turn on the ignition by turning the key, if the car has a start/stop button then press it twice.
- Use the direction keys on the steering wheel and enter the vehicle settings.
- Select the limit speed option by pressing ok and find the OFF option by scrolling up or down.
The speed limiter will be turned off after pressing the OK button. The latest models integrate the speed limiter function into the cruise control stalk. The set speed limiter can be canceled by pressing the brake pedal or pressing the stalk towards the steering wheel.
In the Mercedes Benz cars with touch buttons on the steering wheel, the speed limiter can be removed by selecting the cancel button on the right side of the steering wheel if the car is driven from the right side. Otherwise, the controls for the speed limiter are on the left side.
The speed limiter is important when the car has winter tires. Winter tires have a soft compound rubber that does not harden even if the ambient temperature goes below 7 degrees. The winter tires are designed for maximum grip and not for high speeds. Hence, the top speed of the Mercedes must be limited according to the speed rating of the tire.
The speed rating of the tire is represented by capital letters. It is written on the sidewall of the tire. The speed rating of the winter tires is usually Q, which means the top speed of the car must be limited to 100 Mph.
Speed limiters are also useful in everyday driving in the city or on open roads. There are speed traps and cameras that calculate the average speed. Hence setting the speed limiter can help to keep the speed in check and avoid paying expensive overspeeding fines.
What are the different types of speed limiters on Mercedes Benz?
The different types of speed limiters on Mercedes Benz cars are explained below:
Speed limiter set by the driver
The Driver can set the speed limit by the cruise control or by setting the speed limiter from the menu. If the speed limit is set by using the cruise control stalk of a button on the steering wheel then the car will maintain the speed limit through any elevation changes.
If the driver can reduce the speed by pressing the brake pedal or by adjusting the speed limit in the cruise control. There is also an option to resume the previously set speed limit in the cruise control.
The cruise control can be canceled by the driver anytime by pressing the brake pedal or turning off the cruise control. Mercedes Benz models with touch controls on the steering wheel can press the cancel button to stop cruise control.
The cancel button on the steering wheel can be operated in up and down positions. The resume function is selected if the cancel button is pressed upwards once. Pressing the button upwards two times will activate the traffic assist if the car is equipped with the system.
Speed limiter set by Factory
Apart from the speed limiter that can be set by the driver, Mercedes Benz also used an electrical speed limiter. The top speed of the car is electronically limited to 150 km/hr or 155mph. The speed limiter set by Factory cannot be removed by the driver.
The engine control unit does not allow the top speed to go over 155 mph by controlling the fuel injection quantity. Even if the driver is using full throttle, the top speed of the car will not exceed the speed limit set by the factory.
The speed limiter is set by the factory according to the speed rating of the tires. If this speed limiter is removed then the tires can easily overheat and cause an accident. Therefore, the procedure to remove the speed limiter set by the factory is also complex.
Mercedes Benz sells a performance package only on the few AMG high-performance models. In the performance package, the speed limiter is removed and the top speed is increased to 300 km/hr or more than 165 mph.
Other models are also capable of higher top speeds but the performance package is not available. There is third-party software that can change the coding of the engine control unit and remove the speed limiter set by the factory.
Additionally, there are aftermarket plug-and-play OBD-II devices that can change the coding of the engine control unit. The engine control unit must be reset for the changes to come into effect. After the reset is done, the factory speed limiter is removed.
It is also possible to lower the speed limit of the vehicle by selecting a lower value in the coding of maximum speed. Coding of the engine control unit should only be performed by trained technicians otherwise the control unit can get stuck in bootloader mode.
Can you remove the speed limit warning in the instrument cluster?
Yes, it is possible to remove the speed limit warning in the instrument cluster. A speed limit warning is shown once when the speed goes over 70 mph and then it stays on when the speed is more than 100 mph.
If the manufacturing of the car is before 2019, then the speed limit warning can be removed by performing coding in the instrument cluster. This method does not work for the latest Mercedes Benz models.
There are aftermarket devices that can alter the speed signal to the instrument cluster and also block the mileage of the vehicle. Removing the speed limit warning can be against the traffic rules in some international markets.
Using the mileage and speed signal blockers are untraceable by the authorized dealerships but if the changes in the coding of the control unit are identified then the warranty and the insurance claim of the vehicle can be rejected.
This blog explained the procedure to remove the speed limiter on Mercedes Benz. There is also a Mercedes traffic sign assist system. It can detect the correct speed limit from the road signs and the driver can set the speed limiter according to the road. It is a great addition to the speed limiter and helps to drive the vehicle safely.