2014 Mercedes-Benz CLS550 Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2014 Mercedes-Benz CLS550

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Reviewed by
Devin Cabugcal
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 CLS550 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 CLS550 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.

A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.

What are the initial steps to diagnose the non-functioning cruise control in a 2014 Mercedes-Benz CLS550?

When diagnosing the non-functioning cruise control in a 2014 Mercedes-Benz CLS550, it's essential to start with the simplest solutions before moving on to more complex diagnostics. Begin by checking the cruise control fuse, as a blown or damaged fuse can easily disrupt the system's functionality. Next, inspect the cruise control switch located on the steering wheel to ensure it is operating correctly; a malfunctioning switch can prevent the system from engaging. Following this, verify the vehicle speed sensor, which is crucial for cruise control operation, as it relays speed information to the system. Additionally, keep an eye out for any error codes or warning lights on the dashboard, as these can provide valuable insights into underlying issues. Finally, examine the wiring connections related to the cruise control system for any signs of damage or looseness, as faulty wiring can lead to operational failures. By systematically addressing these areas, you can effectively diagnose and potentially resolve the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2014 Mercedes-Benz CLS550?

When troubleshooting the cruise control system in a 2014 Mercedes-Benz CLS550, it's essential to understand the common problems that may lead to its failure. One of the primary issues is a faulty brake light switch, which can prevent the cruise control from engaging since it is designed to deactivate when the brake pedal is pressed. Additionally, problems with the speed sensor can disrupt the system's ability to maintain a constant speed, leading to erratic behavior or complete failure of the cruise control. Another potential culprit is a malfunctioning throttle actuator, which plays a crucial role in regulating speed. Electrical issues, such as blown fuses or damaged wiring, can also interfere with the cruise control operation, making it vital to inspect the vehicle's electrical system. Lastly, a failure in the cruise control module itself can be a significant factor in the system's malfunction. By systematically checking these components, DIY enthusiasts can effectively diagnose and resolve cruise control issues in their Mercedes-Benz CLS550.

How urgent is it to address the non-functioning cruise control in a 2014 Mercedes-Benz CLS550?

When considering the urgency of fixing a non-functioning cruise control in a 2014 Mercedes-Benz CLS550, it's essential to recognize that while the issue may not present an immediate safety hazard, it can significantly affect your driving experience. A malfunctioning cruise control system can lead to increased driver fatigue during long trips, as maintaining a constant speed becomes more labor-intensive. Additionally, neglecting this issue could result in further complications, such as increased wear on the vehicle's engine and transmission, which may lead to more costly repairs down the line. Therefore, while it might be tempting to postpone repairs, addressing the cruise control malfunction promptly is advisable to ensure optimal vehicle performance and comfort. For those inclined to tackle the issue themselves, understanding the underlying causes—such as faulty sensors or electrical issues—can be a valuable first step in diagnosing and potentially resolving the problem.

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