2015 Mercedes-Benz GLK350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2015 Mercedes-Benz GLK350 and How to Fix Them

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Reviewed by
Aisha
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 GLK350 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 GLK350 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 steps should I take to diagnose the non-functioning cruise control in my 2015 Mercedes-Benz GLK350?

To effectively diagnose the non-functioning cruise control in your 2015 Mercedes-Benz GLK350, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the cruise control fuse located in the fuse box, as a blown fuse is a common and easily fixable issue. Next, examine the cruise control buttons on the steering wheel for any signs of damage or sticking, as these can hinder the system's operation. Following this, verify the functionality of the speed sensor, since a malfunction here can disrupt the cruise control's ability to engage. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Additionally, ensure that the brake and clutch switches are functioning correctly, as faulty switches can prevent activation. Finally, inspect the wiring and connections associated with the cruise control system for any damage or corrosion, as poor connections can lead to failure. By following this structured diagnostic approach, you can efficiently identify and address the root cause of your cruise control issues.

What are the common problems that could cause the cruise control to stop working in a 2015 Mercedes-Benz GLK350?

When the cruise control in your 2015 Mercedes-Benz GLK350 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 detect when 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. A blown fuse in the cruise control circuit can also lead to a complete system failure, necessitating a simple fuse replacement. Furthermore, if the throttle actuator is malfunctioning, it may hinder the cruise control's capacity to sustain a set speed, while a defective cruise control module could require more in-depth diagnosis and replacement. By systematically checking these components, you can identify and address the root cause of your cruise control issues, restoring functionality and enhancing your driving experience.

How urgent is it to address the malfunctioning cruise control in a 2015 Mercedes-Benz GLK350?

Addressing a malfunctioning cruise control system in a 2015 Mercedes-Benz GLK350 is of utmost importance due to the safety risks it poses. A malfunction can lead to unexpected acceleration or deceleration, which significantly increases the likelihood of accidents on the road. Promptly fixing this issue not only safeguards your safety but also that of other drivers and passengers. Additionally, neglecting the problem can result in further damage to the vehicle's components, leading to more extensive and costly repairs down the line. Beyond safety and financial implications, a malfunctioning cruise control detracts from the overall driving experience, making it inconvenient to use this feature when needed. Therefore, it is crucial to prioritize repairs to ensure both safety and the optimal performance of your vehicle.

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