2010 Mercedes-Benz SLK300 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2010 Mercedes-Benz SLK300 and How to Fix Them

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Reviewed by
Bo Fader
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 2010 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 2010 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 2010 Mercedes-Benz SLK300?

When troubleshooting the non-functioning cruise control in a 2010 Mercedes-Benz SLK300, it's essential to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse in the fuse box, as a blown fuse can often be the simplest explanation for the issue. Next, verify the functionality of the cruise control switch located on the steering wheel, since a malfunctioning switch can prevent the system from engaging. Following this, examine the speed sensors, as they play a crucial role in the cruise control operation; faulty sensors can disrupt the system's ability to maintain speed. Utilizing a diagnostic scanner to check for error codes can provide further insights into any underlying issues. Lastly, inspect the wiring and connections associated with the cruise control system for any signs of damage or corrosion, as these can lead to malfunctions. By following these steps in order, you can effectively diagnose and potentially resolve the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2010 Mercedes-Benz SLK300?

When dealing with cruise control issues in a 2010 Mercedes-Benz SLK300, it's essential to understand the common problems that may be at play. One frequent culprit is a faulty brake light switch, which can prevent the cruise control from engaging by failing to signal when the brake pedal is pressed. Additionally, a malfunctioning speed sensor can disrupt the system's ability to maintain a steady speed, leading to operational failures. Another potential issue is a blown fuse within the cruise control system, which can halt functionality entirely and may simply require a replacement to fix. Furthermore, problems with the throttle actuator, whether due to wear or electrical faults, can hinder the cruise control's speed regulation capabilities. Lastly, a defective cruise control module can also be responsible for these issues, necessitating either repair or replacement. By identifying and addressing these common problems, you can effectively troubleshoot and restore the cruise control functionality in your vehicle.

How urgent is it to address the malfunctioning cruise control in a 2010 Mercedes-Benz SLK300?

When it comes to the malfunctioning cruise control in a 2010 Mercedes-Benz SLK300, the urgency of addressing the issue cannot be overstated. A malfunctioning system can lead to unexpected acceleration or deceleration, creating a significant safety hazard for both the driver and other road users. Additionally, the convenience and enjoyment of driving are compromised when this feature fails to operate correctly. Ignoring these symptoms may not only diminish the overall driving experience but can also result in decreased fuel efficiency and potential damage to other vehicle components, leading to more costly repairs down the line. By promptly addressing the cruise control malfunction, you not only enhance your safety on the road but also protect your vehicle's performance and longevity, making it a critical issue that should not be overlooked.

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