2012 Mercedes-Benz SL550 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2012 Mercedes-Benz SL550

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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 2012 Mercedes-Benz SL550 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 2012 Mercedes-Benz SL550 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 are the steps to diagnose the cruise control issue in a 2012 Mercedes-Benz SL550?

To effectively diagnose cruise control issues in your 2012 Mercedes-Benz SL550, begin with the simplest checks to avoid unnecessary complications. Start by inspecting the cruise control fuse; a blown fuse is a common culprit that can easily be replaced. Next, examine the cruise control switch located on the steering wheel, as a malfunctioning switch can disrupt the system's operation. If these initial checks do not resolve the issue, utilize a diagnostic scanner to identify any error codes from the vehicle's onboard computer, which can provide insights into specific problems. Following this, verify the functionality of the speed sensors, as they are essential for the cruise control system to operate correctly. Additionally, inspect the wiring and connections associated with the cruise control system for any signs of damage or corrosion, as faulty wiring can lead to malfunctions. Finally, if all else fails, test the cruise control module itself to ensure it is working properly. By systematically following these steps, you can effectively diagnose and address cruise control issues in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2012 Mercedes-Benz SL550?

When troubleshooting the cruise control system in a 2012 Mercedes-Benz SL550, it's crucial to recognize the common issues that may lead to its malfunction. A primary concern is the brake light switch; if this component is faulty, it may fail to signal when the brake pedal is pressed, preventing the cruise control from engaging. Additionally, the speed sensor plays a vital role in the system's operation, as it provides the necessary speed readings; any issues here can disrupt the cruise control's ability to maintain speed. Vacuum leaks within the cruise control system can also cause significant problems, as they can interfere with the system's operation. Moreover, a defective cruise control module may be at fault, as it is essential for controlling the system's functions. Lastly, electrical issues, including blown fuses or wiring problems, can severely impact the cruise control's performance. By systematically identifying and addressing these common problems, you can effectively troubleshoot and restore the cruise control functionality in your SL550.

How urgent is it to repair the non-functioning cruise control in a 2012 Mercedes-Benz SL550?

When evaluating the urgency of repairing the non-functioning cruise control in a 2012 Mercedes-Benz SL550, it is crucial to recognize the potential safety risks associated with a malfunctioning system. A reliable cruise control feature is essential for maintaining a consistent speed, particularly during long drives, and its failure can lead to erratic speed changes that may endanger both the driver and other road users. Additionally, the comfort and convenience that cruise control provides cannot be overlooked; it significantly reduces driver fatigue on extended journeys, making repairs not just a matter of functionality but also of enhancing the overall driving experience. Furthermore, neglecting this issue could adversely affect the vehicle's resale value, as prospective buyers may view a malfunctioning cruise control as a sign of poor maintenance. Therefore, addressing the repair promptly is advisable to ensure safety, improve comfort, and protect the investment in your vehicle.

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2012 Mercedes-Benz SL550 Cruise Control Problems & Fixes