2011 Mercedes-Benz SLK300 Cruise Control Isn't Working

Fixing Cruise Control Issues in 2011 Mercedes-Benz SLK300

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2011 Mercedes-Benz SLK300 cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty or malfunctioning sensor can lead to incorrect readings, causing issues with engine performance or other systems relying on accurate data.
  • Control Module: A faulty control module can lead to erratic vehicle behavior or failure of various electronic systems due to improper signal processing.
  • Throttle: A faulty throttle body or a defective accelerator pedal position sensor may be causing inconsistent throttle response.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2011 Mercedes-Benz SLK300 cruise control isn't working?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

What are the initial diagnostic steps to troubleshoot the non-functioning cruise control in a 2011 Mercedes-Benz SLK300?

When faced with a non-functioning cruise control in a 2011 Mercedes-Benz SLK300, start your troubleshooting by checking the cruise control fuse, as a blown fuse can often be the simplest explanation for the malfunction. Next, inspect the cruise control switch located on the steering wheel to ensure it is operational; a faulty switch can prevent the system from engaging. It's also essential to verify the functionality of the vehicle speed sensor, as it is integral to the cruise control's operation. Additionally, examine the brake pedal switch, ensuring it is not stuck or malfunctioning, since the cruise control system is designed to disengage when the brakes are applied. Finally, consider scanning the vehicle's onboard computer for any error codes that may provide insight into the underlying issues affecting the cruise control system. By systematically addressing these areas, you can effectively diagnose and potentially resolve the cruise control problem in your SLK300.

What are the common problems that could cause the cruise control to stop working in a 2011 Mercedes-Benz SLK300?

When troubleshooting the cruise control system in a 2011 Mercedes-Benz SLK300, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging if it fails to signal when the brake pedal is pressed. Additionally, issues with the speed sensor can disrupt the system's ability to maintain speed, as it relies on accurate readings to function correctly. Another potential issue is vacuum leaks within the cruise control system, which can significantly impair its operation. Furthermore, a defective cruise control module may require replacement to restore functionality, as it is a critical component of the system. Lastly, electrical problems, such as blown fuses or wiring issues, can also hinder the cruise control's performance. By identifying and addressing these common issues, you can effectively troubleshoot and potentially restore the cruise control system to its intended operation.

How urgent is it to address the malfunctioning cruise control in a 2011 Mercedes-Benz SLK300?

Addressing a malfunctioning cruise control in a 2011 Mercedes-Benz SLK300 is of utmost importance due to the immediate safety risks it poses. A faulty cruise control system can lead to unpredictable speed fluctuations, compromising the vehicle's stability and increasing the likelihood of accidents. Moreover, for those who frequently embark on long drives, the absence of a reliable cruise control can significantly diminish driving comfort, making journeys more taxing and less enjoyable. Additionally, neglecting this issue can lead to more severe complications within the vehicle's systems, potentially resulting in costly repairs down the line. Therefore, it is crucial to prioritize the diagnosis and repair of cruise control malfunctions to ensure not only your safety but also the longevity and performance of your vehicle.

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