2012 Mercedes-Benz SLK250 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2012 Mercedes-Benz SLK250 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 2012 Mercedes-Benz SLK250 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 2012 Mercedes-Benz SLK250 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.

What are the steps to diagnose the non-functioning cruise control in a 2012 Mercedes-Benz SLK250?

To effectively diagnose the non-functioning cruise control in your 2012 Mercedes-Benz SLK250, start with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Begin by inspecting the cruise control fuse located in the vehicle's fuse box, as a blown fuse can often be the simplest explanation for the issue. Next, examine the cruise control buttons on the steering wheel to ensure they are not stuck or damaged, as this can prevent activation. Following this, check the speed sensors, which are essential for the cruise control system to function properly; any dirt or damage here could disrupt operation. Utilizing a diagnostic scanner to check for error codes can provide insights into any underlying electronic issues. Additionally, verify that the brake and clutch switches are functioning correctly, as these components are designed to disengage the cruise control when either pedal is pressed. A thorough inspection of the wiring and connections related to the cruise control system is also crucial, as loose connections or frayed wires can lead to malfunctions. Finally, test the cruise control module to ensure it is sending and receiving signals properly, as a faulty module can be the root cause of the problem. By following this structured diagnostic approach, you can efficiently identify and address the issue with your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2012 Mercedes-Benz SLK250?

When the cruise control in your 2012 Mercedes-Benz SLK250 ceases to function, it can be frustrating, but understanding the common problems can help you diagnose the issue effectively. One of the primary culprits is a faulty brake light switch, which can prevent the system from engaging if it fails to signal that the brake pedal is pressed. Additionally, issues with the speed sensor can disrupt the cruise control's ability to maintain speed, as it relies on accurate readings to operate correctly. Another potential problem is vacuum leaks within the cruise control system, which can interfere with its functionality. A defective cruise control module may also be at fault, as it is essential for the system's operation. Lastly, electrical problems, such as blown fuses or wiring issues, can significantly impact the cruise control's performance. By systematically checking these components, you can identify and resolve the underlying issues, restoring your vehicle's cruise control functionality.

How urgent is it to address the non-functioning cruise control in a 2012 Mercedes-Benz SLK250?

When it comes to the non-functioning cruise control in a 2012 Mercedes-Benz SLK250, understanding the urgency of the situation is crucial for any DIY enthusiast. While the malfunction may not pose an immediate safety risk like failing brakes or steering, it is still essential to address the issue promptly. A functioning cruise control system enhances driving comfort, particularly on long journeys, by allowing the driver to maintain a steady speed and reduce fatigue. Ignoring this problem could lead to inconvenience during extended drives, where the absence of cruise control can be felt most acutely. Moreover, a malfunctioning cruise control may signal deeper issues within the vehicle's electronic systems or sensors, which could potentially affect other critical components. Therefore, while it may not be the top priority compared to more severe mechanical failures, timely repairs to the cruise control system are advisable to ensure the overall performance and reliability of your SLK250. Taking action sooner rather than later can help prevent further complications and maintain the vehicle's functionality.

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