Mercedes-Benz SL65 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz SL65 AMG and How to Fix Them

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Reviewed by
Devin Cabugcal
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 SL65 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 SL65 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 SL65 AMG

When troubleshooting cruise control issues in your Mercedes-Benz SL65 AMG, start by examining the simplest components first. Begin with the brake pedal switch, as a malfunction here can cause the cruise control to disengage unexpectedly. Next, check the brake lights; if they are not functioning correctly, the cruise control system may mistakenly interpret this as a signal that the brakes are being applied. After that, inspect the fuses related to the cruise control system, as a blown fuse can disrupt its operation. If these initial checks do not resolve the issue, consider the condition of the battery and the ABS wheel speed sensor, as these can also affect cruise control functionality. If you find that these components are functioning properly but the problem persists, it may be time to look into the control module or seek professional assistance. By following this diagnostic approach, you can effectively narrow down the potential causes of your cruise control issues and determine the best course of action for repair.

What Are the Common Causes of Cruise Control Malfunction in a Mercedes-Benz SL65 AMG?

When troubleshooting cruise control malfunction in a Mercedes-Benz SL65 AMG, it's essential to consider several common problems that could be affecting the system. One of the primary culprits is a defective brake pedal switch, which can prevent the cruise control from engaging properly. Additionally, a dead battery may disrupt the electrical systems, leading to cruise control failure. It's also important to inspect the ABS wheel speed sensor, as a fault here can trigger warning lights and impact cruise control functionality. The cruise control switch itself is another critical component; if it malfunctions, it can hinder the ability to set or maintain speed. Furthermore, a damaged spiral cable within the steering wheel can obstruct communication between the control switch and the cruise control system, preventing it from activating. Lastly, any underlying electrical issues, such as faulty connectors or wiring, can also contribute to cruise control problems. By systematically checking these components, you can effectively diagnose and resolve the cruise control issues in your SL65 AMG.

Why is the Cruise Control Not Working in a Mercedes-Benz SL65 AMG?

When the cruise control system in your Mercedes-Benz SL65 AMG fails, it’s crucial to address the issue without delay. Ignoring symptoms such as the system not engaging can lead to more significant problems, including safety risks while driving. For instance, a defective brake pedal switch can prevent the cruise control from functioning, which may result in unexpected acceleration or difficulty maintaining speed. Additionally, a malfunctioning ABS wheel speed sensor can trigger warning lights and further disable the cruise control, complicating your driving experience. If the underlying cause is a dead battery or a blown fuse, these issues can escalate, potentially leading to more extensive electrical problems. Moreover, older systems may suffer from broken vacuum lines, which can compromise performance. Given the complexity of these systems and the potential for serious consequences, it is advisable to seek professional assistance to diagnose and resolve any cruise control malfunctions promptly. This proactive approach not only ensures your safety but also helps maintain the integrity of your vehicle’s performance.

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Mercedes-Benz SL65 AMG Cruise Control Issues & Solutions