Mercedes-Benz CLS500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz CLS500 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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Mercedes-Benz CLS500 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 CLS500 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 CLS500

When troubleshooting cruise control issues in your Mercedes-Benz CLS500, it's essential to adopt a systematic diagnostic approach. Start by checking the simplest components first, such as the brake pedal switch and the throttle position sensor, as these are common culprits for cruise control malfunctions. Ensure that the brake pedal switch is functioning correctly, as a faulty switch can prevent the cruise control from engaging, even if the brake lights are operational. Next, inspect the ABS wheel speed sensor, as a failure here can trigger warning lights and disrupt the cruise control system. Additionally, verify that the vehicle's battery is in good condition, as a dead or weak battery can lead to various electrical issues, including cruise control failure. Don't overlook the importance of checking fuses related to the cruise control system; a blown fuse can easily be the source of the problem. By methodically addressing these components, you can effectively diagnose and resolve cruise control issues, restoring functionality to your vehicle.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz CLS500?

When diagnosing cruise control malfunctions in a Mercedes-Benz CLS500, it's essential to consider several common problems that could be affecting the system. One of the primary culprits is the control module, which can fail and disrupt the communication between the cruise control system and the vehicle's other electronic components. Additionally, issues with sensors, such as the speed sensor or throttle position sensor, can lead to erratic behavior or complete failure of the cruise control. A faulty brake light switch is another frequent issue, as it can prevent the cruise control from engaging if it incorrectly signals that the brakes are applied. Furthermore, problems with the throttle actuation, which controls the engine's response to cruise control commands, can also hinder functionality. Other factors to consider include a dead battery, blown fuses, or even issues with the ABS wheel speed sensor, all of which can impact the cruise control system's performance. Lastly, engine or transmission problems in newer models may also play a role, making it crucial to conduct a thorough diagnosis to pinpoint the exact cause of the malfunction. By understanding these potential issues, DIY enthusiasts can take informed steps toward troubleshooting and repairing their vehicle's cruise control system.

Why is the Cruise Control Not Working in a Mercedes-Benz CLS500?

When the cruise control in your Mercedes-Benz CLS500 is not functioning, it’s crucial to address the issue promptly, as neglecting it can lead to safety risks and further complications. A faulty ABS sensor is often a primary culprit; if any of the wheel speed sensors fail, it can disable not only the cruise control but also critical systems like ABS and stability control, potentially compromising your vehicle's handling. Additionally, a malfunctioning cruise control switch may completely hinder the feature, while a defective brake light switch can trigger warning lights and indicate deeper electrical issues. Problems with the throttle control system or even a blown fuse can also disrupt cruise control functionality. Given the interconnected nature of these systems, it is advisable to have the vehicle's diagnostic codes read by a professional to accurately identify the root cause. Addressing these issues not only restores your cruise control but also ensures your vehicle operates safely and efficiently on the road.

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