2017 Mercedes-Benz S550 Cruise Control Isn't Working

Fixing Cruise Control Issues in 2017 Mercedes-Benz S550

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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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2017 Mercedes-Benz S550 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 2017 Mercedes-Benz S550 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 initial diagnostic steps to take when the cruise control is not working on a 2017 Mercedes-Benz S550?

When faced with a malfunctioning cruise control system in a 2017 Mercedes-Benz S550, it's crucial to adopt a systematic diagnostic approach. Begin by checking the cruise control fuse, as a blown fuse is a common and easily fixable issue that can disrupt the system's functionality. Next, inspect the cruise control buttons on the steering wheel; ensure they are responsive and not stuck, as this can prevent engagement. Following this, verify the operation of the speed sensors, since faulty sensors can lead to incorrect speed readings, which directly affect cruise control performance. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Additionally, ensure that the brake lights are functioning correctly, as a malfunctioning brake light switch can inadvertently disable the cruise control. Finally, inspect the wiring connections associated with the cruise control system for any signs of damage or loose connections, as these can hinder communication between components. By methodically addressing these areas, you can effectively diagnose and potentially resolve the cruise control issues in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2017 Mercedes-Benz S550?

When troubleshooting the cruise control system in a 2017 Mercedes-Benz S550, it's essential to understand the common problems that may lead to its malfunction. One prevalent issue is a faulty speed sensor, which can disrupt the system's ability to accurately gauge the vehicle's speed, preventing it from engaging or maintaining the desired speed. Additionally, the brake light switch plays a critical role; if it malfunctions, it may not signal the cruise control system to disengage when the brake pedal is pressed, leading to operational failures. Another potential culprit is the throttle actuator, which controls the engine's throttle opening; any issues here can hinder the system's capacity to maintain a steady speed. Electrical problems, such as blown fuses or wiring issues, can also impede the cruise control's functionality, as can vacuum leaks in the engine that affect the necessary vacuum pressure for operation. By identifying and addressing these common issues, DIY enthusiasts can effectively restore the cruise control functionality in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2017 Mercedes-Benz S550?

When it comes to the non-functioning cruise control in a 2017 Mercedes-Benz S550, addressing the issue should be a priority, even if it may not seem urgent at first glance. While the absence of this feature may not pose an immediate safety risk, it can significantly affect your driving experience, especially during long trips where maintaining a constant speed is crucial for comfort and fuel efficiency. Ignoring the malfunction could lead to increased driver fatigue, as you may find yourself constantly adjusting your speed, which can be both tiring and distracting. Moreover, neglecting this issue might result in further complications down the line, potentially leading to more extensive repairs and increased costs. By taking the time to diagnose and fix the cruise control system promptly, you not only enhance your vehicle's performance but also ensure a more enjoyable and safer driving experience. Therefore, while it may not be an emergency, timely attention to this issue is advisable to prevent any future inconveniences.

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