Mercedes-Benz S550e Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz S550e and How to Fix Them

Find Repair Location
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 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 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz S550e

When troubleshooting cruise control issues in your Mercedes-Benz S550e, it's essential to adopt a systematic diagnostic approach. Start by checking the simplest components, such as the brake light switch, which can often be the culprit even if the brake lights appear to function correctly. Next, inspect the ABS sensors, as failures in these components can disable not only the cruise control but also other critical systems like ABS and stability control. If these checks do not resolve the issue, move on to the throttle actuation system and the control module, as problems here can significantly impact cruise control functionality. Additionally, examine the electrical connections, particularly the spiral cable in the steering wheel, as faulty wiring can prevent the cruise control from engaging. By methodically assessing these areas, you can effectively diagnose and address the cruise control problems in your S550e, ensuring a smoother driving experience.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz S550e?

When troubleshooting cruise control malfunctions in a Mercedes-Benz S550e, it's essential to consider several common problems that could be at play. A failed control module, sensor, or switch can disrupt the system's functionality, while throttle actuation issues may prevent the cruise control from engaging properly. Additionally, a defective brake pedal switch can inadvertently signal that the brakes are applied, disabling the cruise control. It's also wise to check for blown fuses, as these can interrupt the power supply to the cruise control system. Other potential culprits include problems with the throttle control system and a faulty ABS wheel speed sensor, both of which can affect the system's performance. Lastly, engine-related issues, such as a check engine light, may indicate underlying problems that could impact cruise control functionality. By systematically addressing these areas, DIYers can effectively diagnose and resolve cruise control issues, ensuring a smoother driving experience.

Why is the Cruise Control Not Working in a Mercedes-Benz S550e?

When the cruise control in your Mercedes-Benz S550e is not functioning, it’s crucial to address the issue promptly to avoid potential safety risks and further damage to your vehicle. A defective brake pedal switch is a common culprit, as it can prevent the cruise control from engaging properly. Additionally, a dead battery may disrupt the electrical systems, including cruise control functionality. Another significant factor could be a faulty ABS wheel speed sensor, which is essential for the cruise control system to operate accurately. Problems with the throttle control system or ABS can also lead to malfunctions, making it vital to investigate these areas. In older models, a broken vacuum line might be the source of the issue. Ignoring these symptoms can not only compromise your driving experience but also pose serious safety hazards on the road. Therefore, if you notice any signs of cruise control failure, it is advisable to conduct a thorough inspection or consult a professional service team to diagnose and resolve the problem effectively.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.