2005 Mercedes-Benz S500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2005 Mercedes-Benz S500 and How to Fix Them

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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 2005 Mercedes-Benz S500 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 2005 Mercedes-Benz S500 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 2005 Mercedes-Benz S500?

To effectively diagnose the non-functioning cruise control in your 2005 Mercedes-Benz S500, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse, as a blown fuse is a common and easily fixable issue that can halt the system's operation. Next, examine the cruise control buttons on the steering wheel to ensure they are responsive; faulty buttons can prevent engagement. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying electronic issues. Following this, assess the speed sensors, as they are integral to the cruise control's functionality; if they are malfunctioning, the system will not operate correctly. Additionally, verify that the brake and clutch switches are functioning properly, as these components must be operational for the cruise control to activate. If these preliminary checks do not reveal the problem, proceed to test the cruise control module itself, as a defective module can lead to system failure. Finally, inspect the wiring and connections associated with the cruise control system for any signs of damage or loose connections, as these can disrupt functionality. By following this structured diagnostic approach, you can efficiently identify and address the root cause of the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2005 Mercedes-Benz S500?

When the cruise control in a 2005 Mercedes-Benz S500 ceases to function, several common problems may be at play. One of the primary culprits is a faulty brake light switch, which is crucial for the cruise control system as it disengages the system when the brake pedal is pressed. If this switch malfunctions, it can prevent the cruise control from engaging properly. Another potential issue is a malfunctioning speed sensor; this component is essential for the cruise control to maintain a consistent speed, and any disruption can lead to failure. Additionally, vacuum leaks in the engine can significantly impact the cruise control's performance, as these leaks can disrupt the necessary pressure for the system to operate effectively. A defective cruise control module is also a common reason for failure, as it controls the entire system's functionality. Lastly, electrical issues, such as blown fuses or wiring problems, can interfere with the operation of the cruise control system. By understanding these common problems, DIY enthusiasts can better diagnose and address the issues affecting their vehicle's cruise control, ultimately restoring its functionality for a smoother driving experience.

How urgent is it to address the non-functioning cruise control in a 2005 Mercedes-Benz S500?

Addressing a non-functioning cruise control in a 2005 Mercedes-Benz S500 should be considered a priority for any DIY enthusiast. While it may not seem like an immediate emergency, the implications of ignoring this issue can be significant. A malfunctioning cruise control system not only diminishes the convenience of maintaining a steady speed during long drives but may also signal deeper electronic or sensor-related problems that could affect other critical vehicle systems. This is particularly concerning for safety, as a reliable cruise control system helps reduce driver fatigue and enhances fuel efficiency, especially on extended trips. By diagnosing and repairing the cruise control promptly, you can prevent potential safety risks and avoid further damage to your vehicle, ensuring it operates safely and efficiently on the road. Therefore, taking action sooner rather than later is advisable for both your safety and the longevity of your vehicle.

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