2008 Mercedes-Benz S600 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2008 Mercedes-Benz S600 and How to Fix Them

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Reviewed by
Andrew Hajjar
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 2008 Mercedes-Benz S600 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 S600 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 2008 Mercedes-Benz S600?

To effectively diagnose the non-functioning cruise control in your 2008 Mercedes-Benz S600, 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 rectifiable issue. Next, examine the cruise control buttons on the steering wheel to ensure they are operational, as faulty buttons can hinder engagement. Following this, verify the functionality of the speed sensor, since a malfunction here can disrupt the entire cruise control system. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Additionally, assess the brake and clutch switches, as these components are crucial for the cruise control's activation. Finally, inspect the wiring and connections for any signs of damage or corrosion, as poor connections can lead to system failures. 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 2008 Mercedes-Benz S600?

When troubleshooting the cruise control system in a 2008 Mercedes-Benz S600, it's essential to understand the common problems that may lead to its failure. One of the primary culprits is a faulty brake light switch, which can disrupt the system's ability to engage by failing to signal when the brake pedal is pressed. Additionally, issues with the speed sensor can result in inaccurate speed readings, causing the cruise control to malfunction or disengage unexpectedly. Another potential issue is vacuum leaks within the system, which can prevent the cruise control from maintaining a steady speed. Furthermore, a defective cruise control module may hinder the system's responsiveness, making it unresponsive to user commands. Lastly, electrical problems, such as blown fuses or wiring issues, can also significantly impact the operation of the cruise control system. By identifying and addressing these common issues, DIY enthusiasts can effectively troubleshoot and restore functionality to the cruise control in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2008 Mercedes-Benz S600?

Addressing the non-functioning cruise control in a 2008 Mercedes-Benz S600 is crucial for both safety and vehicle performance. A malfunctioning cruise control system not only diminishes the convenience of maintaining a steady speed during long drives but may also signal deeper electronic or sensor-related issues that could impact other critical systems in the vehicle. Ignoring this problem can lead to increased driver fatigue, as the need for constant manual speed control becomes a burden, especially on highways. Moreover, what may initially seem like a minor inconvenience could escalate into a more significant mechanical failure if left unattended, potentially resulting in costly repairs down the line. Therefore, it is essential to prioritize the diagnosis and repair of the cruise control system to ensure a safe and comfortable driving experience.

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