2003 Mercedes-Benz CLK55 AMG Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2003 Mercedes-Benz CLK55 AMG

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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 CLK55 AMG 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 CLK55 AMG 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 CLK55 AMG?

When troubleshooting the non-functional cruise control in a 2003 Mercedes-Benz CLK55 AMG, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse in the fuse box, as a blown fuse is a straightforward fix that can often resolve the issue. Next, verify the functionality of the cruise control switch located on the steering wheel; if it’s not responding, it may need replacement. The brake pedal switch is another critical component to examine, as it must be functioning correctly to prevent the cruise control from engaging when the brake is applied. Additionally, inspect the vehicle speed sensor, which is vital for the cruise control system to operate effectively. If these initial checks do not reveal the problem, using a diagnostic scanner to scan for error codes can provide deeper insights into any underlying issues. Finally, ensure that all wiring and connections related to the cruise control system are intact and free from damage or corrosion. By following this structured approach, you can efficiently identify and address the root cause of the cruise control malfunction.

What are the common problems that could cause the cruise control to stop working in a 2003 Mercedes-Benz CLK55 AMG?

When troubleshooting the cruise control system in a 2003 Mercedes-Benz CLK55 AMG, it's essential to consider several common issues that may be at play. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging if it fails to signal when the brake pedal is pressed. Additionally, the cruise control module itself may be defective, leading to operational failures that require either repair or replacement. Another potential issue is vacuum leaks within the system, which can disrupt the cruise control's functionality. A malfunctioning speed sensor can also hinder the system's ability to maintain a steady speed, resulting in erratic behavior or complete failure. Lastly, various electrical problems, such as blown fuses or wiring issues, can impede the cruise control's operation. By systematically checking these components, DIYers can effectively diagnose and address the underlying problems, restoring the cruise control functionality in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2003 Mercedes-Benz CLK55 AMG?

Addressing the non-functioning cruise control in a 2003 Mercedes-Benz CLK55 AMG is crucial for both safety and vehicle performance. 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 issues that could impact other vehicle systems. Ignoring this problem can lead to increased driver fatigue, as the driver must manually control speed, which is particularly taxing on extended trips. Moreover, a faulty cruise control could be a precursor to more significant mechanical failures, potentially resulting in costly repairs if left unaddressed. Therefore, it is essential for DIY enthusiasts to prioritize this repair to ensure the vehicle operates safely and efficiently, preventing further complications down the road.

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