2008 Mercedes-Benz SLK280 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2008 Mercedes-Benz SLK280 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 2008 Mercedes-Benz SLK280 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 2008 Mercedes-Benz SLK280 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 steps to diagnose the cruise control issue in a 2008 Mercedes-Benz SLK280?

To effectively diagnose a cruise control issue in a 2008 Mercedes-Benz SLK280, it's essential to adopt a systematic diagnostic approach that prioritizes simpler checks before delving into more complex systems. Begin by inspecting the cruise control fuse, as a blown fuse can easily disrupt functionality. Next, examine the cruise control buttons on the steering wheel to ensure they are operational, since faulty buttons can lead to engagement problems. Utilizing a diagnostic scanner to check for error codes in the vehicle's onboard computer can provide valuable insights into potential issues. Following this, assess the speed sensors, which are critical for maintaining the desired speed; any malfunction here can directly affect cruise control performance. Additionally, inspect the brake light switch, as a defective switch can prevent the cruise control from activating. Finally, if all previous checks are clear, test the cruise control module to confirm it is sending the correct signals. By following this structured approach, you can efficiently identify and address the root cause of cruise control malfunctions in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2008 Mercedes-Benz SLK280?

When dealing with cruise control issues in a 2008 Mercedes-Benz SLK280, 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, speed sensor malfunctions can disrupt the system, as accurate speed readings are crucial for cruise control functionality. Another potential issue is vacuum leaks within the cruise control system, which can hinder its operation. A defective cruise control module may also be responsible for the malfunction, as it is the central component that controls the system. Lastly, electrical problems, including blown fuses or wiring issues, can significantly impact the cruise control's performance. By identifying and addressing these common issues, DIYers can effectively troubleshoot and potentially resolve the cruise control problems in their SLK280.

How urgent is it to address the non-functioning cruise control in a 2008 Mercedes-Benz SLK280?

When it comes to the non-functioning cruise control in a 2008 Mercedes-Benz SLK280, understanding the urgency of the situation is crucial for any DIY enthusiast. While the absence of this feature may not pose an immediate safety risk, it can significantly detract from the overall driving experience, especially during long journeys where maintaining a consistent speed is beneficial. Ignoring the problem could lead to increased frustration and discomfort on the road, particularly for those who frequently rely on cruise control for convenience. Moreover, what may seem like a minor inconvenience could potentially mask underlying issues that, if left unaddressed, could escalate into more serious and costly repairs. Therefore, it is advisable to investigate and resolve the cruise control malfunction promptly, ensuring not only a more enjoyable driving experience but also the prevention of further complications down the line.

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2008 Mercedes-Benz SLK280 Cruise Control Issues & Repairs