2010 Mercedes-Benz CLS550 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2010 Mercedes-Benz CLS550 and How to Fix Them

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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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2010 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 2010 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.

What are the steps to diagnose the non-functioning cruise control in a 2010 Mercedes-Benz CLS550?

When diagnosing the non-functioning cruise control in a 2010 Mercedes-Benz CLS550, it's crucial to follow a methodical approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse located in the vehicle's fuse box, as a blown fuse is a common culprit that can easily be replaced. Next, ensure that the cruise control buttons on the steering wheel are operational, since any malfunction here can prevent the system from engaging. Utilizing a diagnostic scanner to retrieve error codes can provide valuable insights into potential issues within the cruise control system. Additionally, check the speed sensors, as faulty sensors can disrupt the system's ability to maintain a set speed. It's also important to verify the functionality of the brake and clutch switches, which are designed to disengage the cruise control when activated. Finally, examine the wiring and connections for any signs of damage or corrosion, and if all other components appear to be in working order, test the cruise control module itself to determine if it needs repair or replacement. By systematically following these steps, you can effectively diagnose and address the issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2010 Mercedes-Benz CLS550?

When troubleshooting the cruise control system in a 2010 Mercedes-Benz CLS550, it's essential to understand the common problems that may lead to its malfunction. 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 system's ability to maintain a constant speed, leading to erratic behavior or complete failure. Another potential issue is a malfunctioning throttle actuator, which plays a crucial role in regulating speed; if it doesn't operate correctly, the cruise control may struggle to function effectively. Electrical problems, such as blown fuses or damaged wiring, can also impede the system's operation, making it vital to check these components during diagnosis. Lastly, vacuum leaks in the engine can cause fluctuations in power, further complicating the cruise control's performance. By identifying and addressing these common issues, you can restore the functionality of your cruise control system and enhance your driving experience.

How urgent is it to repair the non-functioning cruise control in a 2010 Mercedes-Benz CLS550?

When it comes to the urgency of repairing the non-functioning cruise control in a 2010 Mercedes-Benz CLS550, it is crucial to recognize the potential safety risks and the impact on overall driving comfort. A malfunctioning cruise control system can lead to increased driver fatigue, as maintaining a consistent speed becomes a manual task, particularly on long trips. This added strain can distract the driver, heightening the risk of accidents. Furthermore, the cruise control system is often interconnected with other vehicle systems; thus, neglecting this issue could signal or exacerbate underlying problems that may affect the vehicle's performance. Addressing the malfunction promptly not only enhances safety but also ensures a more enjoyable driving experience, making it essential for any DIY enthusiast to prioritize this repair.

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