2003 Mercedes-Benz CL600 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2003 Mercedes-Benz CL600

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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 2003 Mercedes-Benz CL600 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 2003 Mercedes-Benz CL600 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 initial diagnostic steps to troubleshoot the non-functional cruise control in a 2003 Mercedes-Benz CL600?

When troubleshooting the non-functional cruise control in a 2003 Mercedes-Benz CL600, it's essential to adopt a systematic diagnostic approach that begins with the simplest potential issues. Start by checking the cruise control fuse, as a blown or damaged fuse can easily disrupt the system's functionality. Next, inspect the cruise control switch located on the steering wheel to ensure it is operating correctly; a malfunctioning switch can prevent engagement. Following this, verify the brake pedal switch, since a faulty switch may inadvertently signal that the brakes are applied, thereby disabling the cruise control. Additionally, examine the vehicle speed sensor, which is critical for the cruise control system to function properly; if this sensor is not working, it can lead to operational failures. Finally, scanning the vehicle's onboard computer for error codes can provide valuable insights into any underlying issues affecting the cruise control system. By methodically addressing these areas, you can effectively identify and resolve the problems with your cruise control.

What are the common problems that could cause the cruise control to stop working in a 2003 Mercedes-Benz CL600?

When troubleshooting the cruise control system in a 2003 Mercedes-Benz CL600, it's essential to consider several common problems that could be at play. One of the first areas to check is the brake light switch, as a malfunction here can prevent the cruise control from engaging properly. If the switch fails to detect when the brake pedal is pressed, the system will not activate. Additionally, the cruise control module itself may be defective, which can lead to a complete failure of the system. Another critical aspect to inspect is the vacuum system; any leaks can disrupt the cruise control's ability to maintain speed. Furthermore, a faulty speed sensor can hinder the system's performance, making it difficult for the cruise control to keep a consistent speed. Lastly, electrical issues, such as blown fuses or damaged wiring, can also contribute to the cruise control malfunctioning. By systematically checking these components, DIYers can identify and potentially resolve the issues affecting their vehicle's cruise control system.

How urgent is it to address the non-functioning cruise control in a 2003 Mercedes-Benz CL600?

Addressing a non-functioning cruise control in a 2003 Mercedes-Benz CL600 is more urgent than it may initially seem. While it might not appear to be 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 problems that could affect other critical vehicle systems. This is particularly concerning for DIY enthusiasts who may be tempted to delay repairs; neglecting the cruise control issue could lead to safety risks, especially on extended trips where driver fatigue is a factor. Moreover, unresolved issues can escalate, potentially resulting in more extensive and costly repairs down the line. Therefore, it is advisable to diagnose and address the cruise control malfunction promptly, ensuring both the safety and optimal performance of your vehicle. Taking action now can prevent future complications and enhance your driving experience.

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