Mercedes-Benz S65 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz S65 AMG 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 Mercedes-Benz S65 AMG 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 S65 AMG 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 S65 AMG

When troubleshooting cruise control issues in your Mercedes-Benz S65 AMG, it's essential to adopt a systematic diagnostic approach. Begin by checking the simplest components, such as the fuses, as a blown fuse can often be the culprit behind cruise control malfunctions. Next, inspect the brake light switch, which can significantly impact the cruise control system; even if your brake lights appear to be functioning, a faulty switch may still signal to the system that the brakes are engaged, causing it to deactivate. If these components are in good condition, look for any warning messages on the instrument cluster, as these can indicate underlying engine-related problems that need addressing. Additionally, ensure that there are no check engine lights illuminated, as these can also affect cruise control functionality. By following this methodical approach, you can effectively identify and resolve the issues affecting your cruise control system, ensuring a smoother driving experience.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz S65 AMG?

When diagnosing cruise control malfunctions in a Mercedes-Benz S65 AMG, it's essential to consider several common problems that could be at play. Start by checking for faulty cruise control components, as a diagnostic scanner can help retrieve fault codes that pinpoint specific issues. A defective cruise control switch or module may also be the culprit, so testing these parts for functionality is crucial. Additionally, be aware that stepping on the brake while cruise control is engaged will deactivate the system, which is a normal safety feature. If the cruise control operates intermittently, this could indicate underlying electrical or mechanical issues that require further investigation. It's also important to rule out driver error, such as accidentally pressing the accelerator instead of the brake. A thorough inspection of the fuses and relays, particularly the cruise control fuse and the multi-function relay, can reveal if electrical components are failing. Lastly, if warning lights like the ETS and ABS are illuminated, a faulty brake light switch might be preventing the cruise control from functioning, even if the brake lights appear to work. By systematically addressing these potential issues, you can effectively troubleshoot and resolve cruise control problems in your S65 AMG.

Why is the Cruise Control Not Working in a Mercedes-Benz S65 AMG?

When the cruise control in your Mercedes-Benz S65 AMG is not functioning, it’s crucial to address the issue without delay. Ignoring symptoms such as unresponsive controls or sudden disengagement can lead to more significant problems, including compromised safety while driving. For instance, a malfunctioning ABS sensor can not only disable cruise control but also affect your vehicle's overall stability and braking performance. Similarly, a faulty brake pedal switch may prevent the cruise control from engaging, which could lead to dangerous situations, especially on long drives. Additionally, issues like a blown fuse or a defective cruise control switch can escalate if not resolved, potentially resulting in costly repairs. Therefore, it is advisable to diagnose and fix these problems promptly to ensure your vehicle operates safely and efficiently, allowing you to enjoy the luxury and performance that your S65 AMG offers.

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