2003 Mercedes-Benz S500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2003 Mercedes-Benz S500 and How to Fix Them

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Reviewed by
Devin Cabugcal
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 2003 Mercedes-Benz S500 cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty sensor can lead to incorrect readings, causing issues with engine performance or triggering warning lights on the dashboard.
  • Control Module: A faulty control module can result in 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 acceleration and poor engine 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 2003 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 cruise control issue in a 2003 Mercedes-Benz S500?

To effectively diagnose cruise control issues in your 2003 Mercedes-Benz S500, start by checking the fuses associated with the cruise control system, as a blown fuse can easily disrupt functionality. Next, inspect the brake pedal and throttle body for any signs of wear or malfunction, since these components play a crucial role in the operation of cruise control. Utilizing an OBD2 scanner can help you identify any error codes that may indicate underlying problems, particularly with the speed sensor, which is vital for cruise control performance. If the check engine light is illuminated, it’s essential to address this first, as it may be the root cause of the cruise control failure. Should these initial steps not reveal the issue, consider consulting a professional service team for further assistance. By following this structured approach, you can efficiently troubleshoot and potentially resolve cruise control problems in your vehicle.

How urgent is it to repair the non-functioning cruise control in a 2003 Mercedes-Benz S500?

Repairing the non-functioning cruise control in a 2003 Mercedes-Benz S500 should be considered a priority for any driver who values both comfort and safety on the road. A malfunctioning cruise control system can significantly detract from the driving experience, especially during long journeys where maintaining a steady speed is essential. While the immediate impact may not seem severe, neglecting this issue can lead to increased frustration and distraction, which could ultimately compromise safety. Simple fixes, such as replacing a blown fuse or addressing a faulty brake switch, can often resolve the problem quickly and affordably. However, if the malfunction stems from more complex issues like a defective ABS wheel speed sensor, the urgency escalates, as these problems can lead to more serious safety concerns, including erratic acceleration. Therefore, it is advisable to diagnose and repair cruise control issues promptly to ensure a smooth, safe, and enjoyable driving experience.

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Non-Functioning Cruise Control in 2003 Mercedes S500