2015 Mercedes-Benz S65 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2015 Mercedes-Benz S65 AMG and How to Fix Them

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Reviewed by
Bo Fader
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 2015 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 2015 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.

What steps should I take to diagnose the non-functioning cruise control in my 2015 Mercedes-Benz S65 AMG?

To effectively diagnose the non-functioning cruise control in your 2015 Mercedes-Benz S65 AMG, begin with the simplest checks to avoid unnecessary complications. Start by inspecting the cruise control fuse located in the fuse box, as a blown fuse is a common culprit that can easily be replaced. Next, examine the cruise control buttons on your steering wheel to ensure they are operational; sometimes, dirt or wear can hinder their functionality. Following this, verify the speed sensors, as faulty sensors can disrupt the cruise control system's ability to maintain speed. It's also essential to check the brake pedal switch, which is critical for cruise control operation; if this switch is malfunctioning, it may prevent the system from engaging. If these initial checks do not resolve the issue, utilize a diagnostic scanner to identify any error codes that could indicate deeper problems within the system. Should you still be unable to pinpoint the issue after these steps, it may be wise to consult a professional mechanic or an authorized Mercedes-Benz service center for a comprehensive diagnosis and repair. By systematically addressing these areas, you can efficiently troubleshoot and potentially resolve the cruise control malfunction in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2015 Mercedes-Benz S65 AMG?

When the cruise control in a 2015 Mercedes-Benz S65 AMG ceases to function, it can be attributed to several common issues that are often manageable for a DIY enthusiast to diagnose. One primary culprit is a faulty speed sensor, which is crucial for the system to accurately gauge the vehicle's speed; if this sensor malfunctions, the cruise control may fail to engage or maintain the desired speed. Another frequent issue involves the brake light switch; if this switch is defective, it may incorrectly signal the cruise control to disengage, preventing it from operating properly. Additionally, problems with the throttle actuator can hinder the system's ability to maintain speed, as this component regulates the engine's throttle opening. A defective cruise control module can also disrupt communication between various system components, leading to operational failures. Lastly, electrical problems such as wiring issues or blown fuses can significantly impact the cruise control's functionality. By understanding these common problems, DIYers can take the first steps toward diagnosing and potentially fixing the cruise control system in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2015 Mercedes-Benz S65 AMG?

When it comes to the non-functioning cruise control in your 2015 Mercedes-Benz S65 AMG, addressing the issue should be a top priority. The cruise control system not only enhances driving comfort by maintaining a steady speed, but it also plays a crucial role in overall vehicle safety and performance. A malfunctioning system may indicate deeper electronic or sensor-related problems that could compromise your vehicle's functionality. Ignoring this issue can lead to increased driver fatigue during long trips, as well as potential safety risks if the system fails unexpectedly. Moreover, a faulty cruise control could be a warning sign of larger underlying issues that may affect other critical systems in your vehicle. Therefore, it is advisable to conduct a thorough inspection or seek assistance from a qualified mechanic or authorized service center. By addressing the problem promptly, you can ensure the safety and reliability of your Mercedes-Benz S65 AMG, allowing you to enjoy a worry-free driving experience.

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2015 Mercedes-Benz S65 AMG Cruise Control Issues & Repairs