Mercedes-Benz S600 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 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 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz S600

When troubleshooting cruise control issues in your Mercedes-Benz S600, begin by checking the simplest components first. Start with the brake pedal switch, as a defective switch is a common culprit for cruise control malfunctions. If the switch appears to be functioning, inspect the ABS wheel speed sensor, which can also affect the cruise control system and may trigger warning lights. Next, examine the fuses related to the cruise control system; a blown fuse can easily disrupt its operation. Additionally, ensure that your brake lights are working properly, as a faulty brake light or switch can prevent the cruise control from engaging. Finally, if the check engine light is illuminated, it may indicate underlying engine issues that could impact the cruise control functionality. By systematically addressing these components, you can effectively diagnose and potentially resolve the cruise control issues in your vehicle. If these steps do not yield results, consider consulting a professional mechanic for a thorough diagnosis.

What Are the Common Problems Causing Cruise Control Issues in a Mercedes-Benz S600?

When experiencing cruise control issues in your Mercedes-Benz S600, it's essential to understand the common problems that may be at play. One frequent culprit is a faulty brake light switch, which can prevent the cruise control system from engaging properly. If you notice that your cruise control isn't functioning, start by inspecting this switch for any signs of malfunction. Another potential issue is a malfunctioning speed sensor; if this component fails, it can disrupt the system's ability to maintain a consistent speed. Additionally, vacuum leaks in the engine can significantly impact cruise control performance, so checking the vacuum lines for any leaks is crucial. A faulty cruise control module may also be responsible for the problem, as it controls the system's operation. Lastly, don't overlook electrical issues, such as blown fuses or wiring problems, which can interfere with the cruise control system. By systematically addressing these common problems, you can troubleshoot and restore the functionality of your cruise control system, ensuring a smoother driving experience.

Why is the Cruise Control Not Working in a Mercedes-Benz S600?

When your Mercedes-Benz S600's cruise control is not functioning, it is crucial to address the issue promptly, as neglecting it can lead to safety risks and further complications. A defective brake pedal switch is a common culprit, as it may fail to engage when the brake is pressed, preventing cruise control activation. Additionally, a dead battery can disrupt the cruise control system's functionality, while a faulty ABS wheel speed sensor can also contribute to the problem. If you encounter an error message indicating that "cruise control and speedtronic are inoperative," this may point to issues with the speedtronic handle or system that require immediate attention. Furthermore, an ESP error can disable cruise control, often triggered by malfunctions in components like the brake light switch or wheel speed sensor. Given the potential safety implications and the risk of further damage, it is advisable to have your vehicle inspected by a professional service team to accurately diagnose and resolve the underlying issues affecting your cruise control system.

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