Mercedes-Benz CLK550 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz CLK550 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
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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 Mercedes-Benz CLK550 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 Mercedes-Benz CLK550 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz CLK550

When troubleshooting cruise control issues in your Mercedes-Benz CLK550, it's crucial to follow a structured diagnostic approach to efficiently identify and resolve the problem. Begin by examining the brake light switch, as this component can significantly impact the cruise control system even if the brake lights are functioning properly. If the brake light switch appears to be in good condition, proceed to inspect the cruise control switch itself, as any malfunction here can lead to unexpected disengagement of the cruise control. Should these initial checks not reveal the issue, turn your attention to the ABS sensors, since a failure in this area can disable the cruise control along with other vital systems like ABS and stability control. If the cruise control still does not operate correctly after these checks, it may be necessary to investigate the control module and other related sensors, which could require more advanced diagnostics or professional help. By systematically addressing these components, you can effectively troubleshoot and restore the functionality of your cruise control system.

What Could Cause Cruise Control Malfunctions in a Mercedes-Benz CLK550?

When dealing with cruise control malfunctions in a Mercedes-Benz CLK550, several common problems may be at play. One of the first things to check is the fuse associated with the cruise control system, as a blown fuse can easily disrupt its functionality. Additionally, the brake pedal switch is crucial; if it is defective, it may prevent the cruise control from engaging properly. Another area to investigate is the throttle control system, as any malfunctions here can directly impact cruise control performance. Furthermore, issues with the Anti-lock Braking System (ABS) can also interfere with cruise control operation, making it essential to ensure that this system is functioning correctly. Lastly, for older models, a broken vacuum line can lead to significant cruise control issues, so inspecting this component is advisable. By understanding these common problems, DIYers can effectively diagnose and address cruise control malfunctions in their CLK550, ensuring a smoother driving experience.

Why is it Critical to Fix the Non-Working Cruise Control in a Mercedes-Benz CLK550?

Fixing a non-working cruise control in your Mercedes-Benz CLK550 is not just a matter of convenience; it is a critical safety concern that demands immediate attention. A malfunctioning cruise control system can lead to erratic speed control, increasing the risk of accidents, especially during long highway drives where maintaining a steady speed is essential. Moreover, the comfort of driving is significantly compromised when you have to constantly manage the accelerator pedal, making long trips more tiring and less enjoyable. Beyond safety and comfort, a faulty cruise control may indicate deeper issues within the vehicle, such as problems with the throttle control or ABS, which could affect overall performance. Ignoring these symptoms can lead to more severe damage and costly repairs down the line. Additionally, a fully functional cruise control system contributes positively to the resale value of your vehicle, as potential buyers are likely to be deterred by any non-working features. Therefore, addressing cruise control issues promptly is crucial not only for your safety and driving experience but also for the long-term health and value of your Mercedes-Benz CLK550.

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