Mercedes-Benz CLK500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz CLK500 and How to Fix Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Mercedes-Benz CLK500 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 Mercedes-Benz CLK500 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz CLK500

When troubleshooting cruise control issues in a Mercedes-Benz CLK500, it's essential to adopt a systematic diagnostic approach. Begin by checking the fuse associated with the cruise control system, as a blown fuse is a straightforward fix that can often resolve the problem. Next, inspect the brake lights; if they are not functioning correctly, this could indicate a faulty brake switch, which is another common issue that can disrupt cruise control operation. If these initial checks do not yield results, consider the possibility of engine-related problems, especially if the check engine light is illuminated. This could suggest deeper electronic or mechanical issues within the cruise control system. Pay attention to how the cruise control behaves; if it engages briefly before deactivating or drops out intermittently, these symptoms can provide valuable clues for further diagnosis. By following this methodical approach, you can effectively identify and address the underlying issues affecting your vehicle's cruise control functionality.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz CLK500?

When dealing with cruise control malfunctions in a Mercedes-Benz CLK500, it's essential to understand the common problems that may arise. A failed control module, sensor, or switch is often at the heart of the issue, as these components are crucial for the system's operation. Additionally, throttle actuation problems, particularly a faulty throttle position sensor, can cause the engine's computer to mismanage fuel delivery, resulting in noticeable black exhaust. Other potential culprits include a defective brake pedal switch, which can mistakenly signal the system to disengage, or issues with the ABS wheel speed sensor that may disrupt the cruise control's functionality. Furthermore, the cruise control switch itself, along with various control modules and wiring harnesses, can develop faults that lead to malfunction. It's also worth noting that external factors, such as rainy weather, can impact the system's performance, as some drivers have reported receiving "Cruise Control Inoperative" messages during adverse conditions. To effectively troubleshoot and resolve these issues, a thorough diagnosis of each component is necessary, ensuring that the specific cause of the malfunction is accurately identified and addressed.

Why is the Cruise Control Not Working in a Mercedes-Benz CLK500?

When the cruise control in your Mercedes-Benz CLK500 is not functioning, it is crucial to address the issue promptly, as neglecting it can lead to safety risks and further complications. A malfunctioning cruise control system can distract the driver, especially during long drives, increasing the likelihood of accidents. Common culprits such as a defective brake pedal switch or a blown fuse may seem minor, but they can significantly impact your vehicle's performance and safety features. Additionally, if the system displays error messages like "cruise control and speedtronic inoperative," it may indicate deeper issues that could affect other systems in your car, such as the ABS or throttle control. Ignoring these symptoms not only compromises your driving experience but can also lead to more extensive repairs down the line. Therefore, it is essential to diagnose and resolve any cruise control problems as soon as they arise to ensure your vehicle remains safe and reliable on the road.

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