2014 Mercedes-Benz SLK350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2014 Mercedes-Benz SLK350 and How to Fix Them

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Reviewed by
Andrew Hajjar
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 2014 Mercedes-Benz SLK350 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 2014 Mercedes-Benz SLK350 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-functional cruise control in a 2014 Mercedes-Benz SLK350?

When faced with a non-functional cruise control in your 2014 Mercedes-Benz SLK350, it's crucial to adopt a systematic diagnostic approach. Start by checking the cruise control fuse; a blown fuse can often be the simplest explanation for the malfunction. Next, verify the cruise control switch for any signs of damage or wear, as a faulty switch can prevent the system from engaging. It's also important to examine the speed sensors, ensuring they are clean and unobstructed, as debris can hinder their performance. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues affecting the cruise control system. Finally, inspect the wiring connections associated with the cruise control; loose or corroded connections can disrupt the system's functionality. By following these steps, you can effectively narrow down the potential causes of the cruise control issue and take appropriate action to resolve it.

What are the common problems that could cause the cruise control to stop working in a 2014 Mercedes-Benz SLK350?

When the cruise control in your 2014 Mercedes-Benz SLK350 stops functioning, 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 detect when the brake pedal is pressed. Additionally, issues with the speed sensor can disrupt the cruise control's ability to maintain a constant speed, leading to its failure. Another potential problem is a malfunctioning throttle actuator, which is crucial for regulating speed. Electrical problems, such as blown fuses or wiring issues, can also interfere with the cruise control system's operation. Lastly, vacuum leaks in the engine can impact the system's performance by affecting the engine's ability to maintain a steady speed. By identifying these common issues, you can take the necessary steps to troubleshoot and restore your cruise control functionality.

How urgent is it to repair the non-functioning cruise control on a 2014 Mercedes-Benz SLK350?

Repairing the non-functioning cruise control on a 2014 Mercedes-Benz SLK350 should be prioritized due to its implications for both convenience and safety. While it may not seem like an immediate emergency, the cruise control system plays a crucial role in maintaining a steady speed, which can significantly reduce driver fatigue during long journeys. Ignoring this issue could lead to more serious problems within the vehicle's electrical system, potentially affecting other critical functions. Moreover, a malfunctioning cruise control system can compromise safe driving practices, as it may lead to erratic speed changes that could endanger both the driver and other road users. Therefore, addressing the repair promptly not only enhances the driving experience but also safeguards against further complications, ensuring the vehicle operates at its best.

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