2011 Mercedes-Benz S400 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2011 Mercedes-Benz S400

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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 2011 Mercedes-Benz S400 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 2011 Mercedes-Benz S400 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-functioning cruise control in a 2011 Mercedes-Benz S400?

When troubleshooting the non-functioning cruise control in a 2011 Mercedes-Benz S400, start with the simplest checks to avoid unnecessary complexity. Begin by inspecting the cruise control fuse; a blown fuse can easily disrupt the system's functionality. Next, examine the cruise control switch located on the steering wheel to ensure it is operational, as a faulty switch can prevent engagement. Following this, verify the vehicle speed sensor, which is essential for cruise control to function correctly; if it’s malfunctioning, the system won’t activate. Additionally, check the brake pedal switch, as any sticking or failure here will cause the cruise control to disengage when the brakes are applied. Finally, consider scanning the vehicle's onboard computer for error codes that may indicate specific issues within the cruise control system. By systematically addressing these areas, you can effectively diagnose and potentially resolve the cruise control problem in your S400.

What are the common problems that could cause the cruise control to stop working in a 2011 Mercedes-Benz S400?

When dealing with cruise control issues in a 2011 Mercedes-Benz S400, it's essential to understand the common problems that may be at play. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging since this switch is designed to disengage the system when the brakes are applied. Another significant factor could be a malfunctioning speed sensor; this component is vital for maintaining a consistent speed, and any failure here can disrupt cruise control functionality. Additionally, the throttle actuator, responsible for controlling the throttle opening, may also fail, leading to difficulties in speed maintenance. Electrical issues, such as blown fuses or wiring problems, can further complicate matters, as they may prevent the cruise control module from operating correctly. Lastly, vacuum leaks in the engine can impact the cruise control system, as these leaks can interfere with the vacuum-operated components necessary for its operation. By identifying and addressing these issues, DIYers can effectively troubleshoot and restore the cruise control functionality in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2011 Mercedes-Benz S400?

Addressing the non-functioning cruise control in a 2011 Mercedes-Benz S400 is an issue that should not be overlooked, as it carries significant implications for both safety and vehicle performance. A malfunctioning cruise control system can lead to erratic speed changes, increasing the risk of accidents, particularly during long drives where maintaining a steady speed is crucial. Moreover, the absence of this feature can detract from the overall driving experience, making long trips more tiring and less enjoyable. Additionally, a faulty cruise control may indicate deeper issues within the vehicle's electronic or engine control systems, which, if left unaddressed, could result in more severe damage and costly repairs down the line. Lastly, ensuring that all systems, including cruise control, are functioning properly is essential for preserving the vehicle's resale value, as potential buyers often look for well-maintained features. Therefore, while it may not seem like an immediate emergency, the urgency of resolving this issue is clear, as it directly impacts safety, comfort, and the long-term health of your vehicle.

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