2017 Mercedes-Benz S550e Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2017 Mercedes-Benz S550e

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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 2017 Mercedes-Benz S550e 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 S550e 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 troubleshoot the non-functional cruise control in a 2017 Mercedes-Benz S550e?

When faced with a non-functional cruise control in a 2017 Mercedes-Benz S550e, start your troubleshooting by checking the cruise control fuse, as a blown fuse can often be the simplest explanation for the malfunction. Next, ensure that the cruise control settings are correctly configured according to the vehicle's manual, as incorrect settings can prevent the system from engaging. If these initial checks do not resolve the issue, use a diagnostic scanner to look for any error codes that may indicate deeper problems within the system. Additionally, inspect the cruise control buttons on the steering wheel for any signs of damage or sticking, as these can hinder functionality. It’s also essential to verify that the brake pedal switch is operating correctly, since cruise control will disengage if the brake is pressed. Finally, check the vehicle speed sensor, as it is crucial for the cruise control system to function properly. By following these steps in order, you can effectively diagnose and potentially resolve the cruise control issue on your own.

What are the common problems that could cause the cruise control to stop working in a 2017 Mercedes-Benz S550e?

When dealing with cruise control malfunctions in a 2017 Mercedes-Benz S550e, it's essential to understand the common problems that may arise. One frequent culprit is a faulty speed sensor, which can disrupt the system's ability to maintain the desired speed. Additionally, a malfunctioning brake light switch can lead to unexpected disengagement of the cruise control, even when the brakes are not applied. Another potential issue is with the throttle actuator, which may hinder communication between the cruise control system and the engine, resulting in operational difficulties. Vacuum leaks within the engine can also impact the cruise control's performance by preventing it from maintaining a steady speed. Lastly, various electrical problems, including blown fuses or wiring issues, can cause the cruise control module to fail. By understanding these common problems, DIYers can effectively troubleshoot and potentially resolve the cruise control issues in their vehicle.

How urgent is it to address the malfunctioning cruise control in my 2017 Mercedes-Benz S550e?

Addressing the malfunctioning cruise control in your 2017 Mercedes-Benz S550e is of utmost urgency due to the significant safety risks it poses. A faulty cruise control system can lead to unpredictable vehicle behavior, such as sudden acceleration or deceleration, which can be particularly hazardous on highways where maintaining a consistent speed is crucial. The potential for loss of control over your vehicle's speed not only increases the risk of accidents but can also compromise the safety of you and other road users. Furthermore, neglecting this issue can adversely affect your vehicle's overall performance and efficiency, leading to a decline in driving experience. Ignoring the symptoms may also result in more extensive damage to other vehicle components, ultimately leading to more costly repairs. Therefore, it is essential to prioritize the diagnosis and repair of your cruise control system by a qualified mechanic to ensure the safe and efficient operation of your Mercedes-Benz S550e.

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