2008 Mercedes-Benz S550 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2008 Mercedes-Benz S550 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2008 Mercedes-Benz S550 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 2008 Mercedes-Benz S550 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 2008 Mercedes-Benz S550?

To effectively diagnose a cruise control issue in your 2008 Mercedes-Benz S550, start with the simplest checks before moving on to more complex diagnostics. Begin by inspecting the brake pedal switch, as a malfunction here is a common culprit for cruise control failures. If the switch appears to be functioning, the next step is to check the cruise control fuse; a blown fuse will completely disable the system. Additionally, examine any related components or sensors that are crucial for the cruise control's operation, as defects in these areas can lead to functionality problems. It's also wise to test the brake lights, since the brake pedal switch controls them; if the lights are not working, this could indicate an issue with the switch itself. While these steps can help you identify the problem, if the issue persists, consulting a professional service team is recommended for a thorough diagnosis and repair. By following this structured approach, you can efficiently troubleshoot and potentially resolve cruise control issues, ensuring a more enjoyable driving experience.

What are the common problems that could cause the cruise control to stop working in a 2008 Mercedes-Benz S550?

When the cruise control in your 2008 Mercedes-Benz S550 stops functioning, 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 is crucial for the cruise control system as it disengages when the brake pedal is pressed. If this switch is malfunctioning, it may prevent the cruise control from engaging altogether. Another potential issue is related to the speed sensor; if this component is not providing accurate speed readings, the cruise control will not operate correctly. Additionally, vacuum leaks can disrupt the system's ability to maintain a steady speed, leading to erratic behavior or complete failure of the cruise control. A defective cruise control module may also be at fault, as it is responsible for the overall operation of the system and may need replacement if found to be faulty. Lastly, electrical problems such as blown fuses or wiring issues can significantly impact the cruise control's functionality. By systematically checking these components, you can identify and resolve the issues affecting your cruise control system, restoring its functionality and enhancing your driving experience.

How urgent is it to address the non-functioning cruise control in a 2008 Mercedes-Benz S550?

Addressing the non-functioning cruise control in your 2008 Mercedes-Benz S550 is not just a matter of convenience; it is a critical safety concern that warrants immediate attention. A malfunctioning cruise control system can lead to erratic vehicle behavior, which may compromise your control while driving, especially on long trips or highways. Additionally, the underlying causes of the cruise control failure, such as defective components or sensors, could potentially affect other performance aspects of your vehicle, leading to more significant and costly repairs down the line. Ignoring these symptoms can escalate into serious safety risks, making it imperative to diagnose and resolve the issue promptly. Fortunately, the repair process can often be straightforward, involving simple tasks like cleaning or replacing the cruise control button. By taking action now, you not only enhance your driving experience but also ensure the safety and reliability of your vehicle on the road.

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2008 Mercedes-Benz S550 Cruise Control Issues & Repairs