2015 Mercedes-Benz SLK55 AMG Cruise Control Isn't Working

Fixing Cruise Control Issues in 2015 Mercedes-Benz SLK55 AMG

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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 2015 Mercedes-Benz SLK55 AMG 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 2015 Mercedes-Benz SLK55 AMG 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 2015 Mercedes-Benz SLK55 AMG?

To effectively diagnose a cruise control issue in a 2015 Mercedes-Benz SLK55 AMG, it's essential to adopt a systematic approach that begins with the simplest potential problems before progressing to more complex diagnostics. Start by checking the cruise control fuse, as a blown fuse can easily disrupt functionality. Next, inspect the cruise control buttons on the steering wheel to ensure they are operational, since faulty buttons can lead to engagement issues. Utilizing a diagnostic scanner to check for error codes from the vehicle's onboard computer can provide valuable insights into any underlying problems. Additionally, verify the speed sensors, as they are critical for the cruise control system's performance; malfunctioning sensors can prevent the system from working correctly. It's also important to examine the wiring connections associated with the cruise control system for any signs of damage or corrosion, as poor connections can hinder functionality. Finally, testing the cruise control module itself is crucial, as a defective module can be the root cause of the problem. By following this structured diagnostic approach, you can efficiently identify and address the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2015 Mercedes-Benz SLK55 AMG?

When troubleshooting the cruise control system in a 2015 Mercedes-Benz SLK55 AMG, it's essential to consider several common issues that may be at play. A faulty speed sensor is often a primary culprit, as it plays a crucial role in relaying the vehicle's speed to the cruise control system. If this sensor malfunctions, the system may fail to engage or maintain the desired speed. Additionally, the brake light switch can also cause problems; if it is defective, it may incorrectly signal that the brakes are applied, thereby deactivating the cruise control. Another area to inspect is the throttle actuator, which is responsible for adjusting the throttle position. If this component is not functioning correctly, it can hinder the cruise control's ability to operate smoothly. Furthermore, a defective cruise control module itself can lead to complete system failure, necessitating repair or replacement. Lastly, don't overlook potential electrical issues, such as wiring problems or blown fuses, which can disrupt the entire cruise control system. By systematically checking these components, DIYers can effectively diagnose and potentially resolve the cruise control issues in their SLK55 AMG.

How urgent is it to address the malfunctioning cruise control in a 2015 Mercedes-Benz SLK55 AMG?

When it comes to a malfunctioning cruise control system in a 2015 Mercedes-Benz SLK55 AMG, the urgency of addressing the issue cannot be overstated. A faulty cruise control can lead to unpredictable vehicle behavior, such as sudden acceleration or deceleration, which poses significant safety risks to both the driver and other road users. Moreover, these issues may be symptomatic of deeper electronic or sensor-related problems that could compromise the vehicle's overall performance and drivability. Neglecting to resolve cruise control malfunctions can also result in decreased fuel efficiency and increased wear on critical components, leading to more extensive and costly repairs down the line. Therefore, it is crucial to diagnose and repair any cruise control issues promptly, not only to ensure a safe driving experience but also to maintain the vehicle's health and longevity. Seeking the expertise of a qualified mechanic at the first sign of trouble is the best course of action to mitigate potential risks and complications.

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