2014 Mercedes-Benz SL550 Cruise Control Isn't Working

Fixing Cruise Control Issues in 2014 Mercedes-Benz SL550

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Reviewed by
Aisha
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 2014 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 2014 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.

What are the steps to diagnose the non-functioning cruise control in a 2014 Mercedes-Benz SL550?

When diagnosing the non-functioning cruise control in a 2014 Mercedes-Benz SL550, it's crucial to follow a methodical diagnostic approach that prioritizes simpler checks before delving into more complex issues. Begin by inspecting the cruise control fuse, as a blown fuse is a common and straightforward problem that can easily disrupt the system's functionality. Next, examine the cruise control switch on the steering wheel; if this switch is malfunctioning, it can lead to significant cruise control issues. After that, assess the speed sensors, since faulty sensors can prevent the cruise control from engaging as intended. Utilizing a diagnostic scanner to check for error codes can also be beneficial, as it may reveal specific problems within the vehicle's onboard computer. Additionally, inspect the wiring and connections related to the cruise control system for any signs of damage or corrosion, which can interfere with the necessary signals. Finally, test the cruise control module itself, as a malfunctioning module can result in complete system failure. If these steps do not yield results, seeking assistance from a professional mechanic or an authorized Mercedes-Benz service center is advisable. By adhering to this structured approach, you can effectively diagnose and potentially resolve the issues with your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2014 Mercedes-Benz SL550?

When troubleshooting the cruise control system in a 2014 Mercedes-Benz SL550, it's essential to understand the common problems that may lead to its failure. One prevalent issue is a faulty brake light switch, which can prevent the system from engaging properly if it fails to detect when the brake pedal is pressed. Additionally, speed sensor issues can cause inaccurate readings, resulting in the cruise control malfunctioning or disengaging unexpectedly. Another critical component is the throttle actuator; if it malfunctions, the system may struggle to maintain a consistent speed. Electrical problems, such as blown fuses or wiring issues, can also disrupt the functionality of the cruise control. Lastly, a failure in the cruise control module itself can lead to a complete lack of response to commands. Understanding these potential issues can help DIY enthusiasts diagnose and address the problem effectively, although consulting a qualified mechanic is advisable for a thorough inspection and repair.

How urgent is it to address the non-functioning cruise control in a 2014 Mercedes-Benz SL550?

When it comes to the non-functioning cruise control in a 2014 Mercedes-Benz SL550, understanding the urgency of the situation is crucial for any DIY enthusiast. While the immediate safety risks may not be apparent, neglecting this issue can lead to a range of complications that could affect your driving experience and vehicle performance. A malfunctioning cruise control system not only diminishes the convenience of maintaining a steady speed during long drives but can also contribute to driver fatigue, which is particularly concerning on extended trips. Moreover, if left unaddressed, the underlying electrical issues that may be causing the cruise control failure could escalate, potentially leading to more significant and costly repairs down the line. Therefore, it is advisable to inspect and repair the cruise control system promptly, ensuring that your vehicle remains safe, efficient, and enjoyable to drive. Taking action sooner rather than later can save you from discomfort and inconvenience, making your DIY efforts worthwhile.

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