Mercedes-Benz CLK350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz CLK350 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
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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 CLK350 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 CLK350 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.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.

Troubleshooting Cruise Control Issues in a Mercedes-Benz CLK350

When troubleshooting cruise control issues in your Mercedes-Benz CLK350, it's essential to adopt a methodical diagnostic approach. Start by checking the cruise control module, as a malfunction here can prevent the system from operating correctly. Next, inspect the throttle sensor, ensuring it is functioning properly, as a faulty sensor can disrupt cruise control engagement. Pay attention to the speed range; if the cruise control fails to activate within certain speeds, this could indicate a deeper issue. If you experience intermittent operation, consider both electronic and mechanical components that may be at fault. Additionally, monitor the instrument cluster for any warning messages that could provide clues about the underlying problems. If the ABS and ETS lights are illuminated, this may point to a malfunctioning brake light switch, which is crucial for cruise control functionality. Lastly, familiarize yourself with how the cruise control system operates, as understanding its mechanics can aid in diagnosing issues effectively. By following this structured approach, you can efficiently pinpoint and resolve the cruise control problems in your CLK350, ensuring a smoother driving experience.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz CLK350?

When diagnosing cruise control malfunctions in a Mercedes-Benz CLK350, 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 with the throttle position sensor, can lead to erratic engine behavior, such as excessive fuel consumption and black exhaust, indicating a deeper issue. The ABS wheel speed sensor is another critical element; if it fails, it can disable the cruise control entirely, necessitating a thorough diagnostic test to identify the root cause. Furthermore, electrical issues, such as a malfunctioning spiral cable in the steering wheel, can disrupt communication between the control switch and the cruise control system. Lastly, it's important to consider the impact of incorrectly sized tires, which can cause the cruise control to disengage due to discrepancies in wheel rotational speed. By being aware of these potential issues, DIY enthusiasts can better troubleshoot and address cruise control problems in their CLK350, although professional assistance may be required for more complex repairs.

Why is the Cruise Control Not Working in a Mercedes-Benz CLK350?

When the cruise control in your Mercedes-Benz CLK350 is not functioning, it is crucial to address the issue without delay. Ignoring symptoms such as a malfunctioning brake pedal switch or a faulty ABS wheel speed sensor can lead to more significant safety risks while driving. For instance, a defective brake pedal switch may not only disable your cruise control but could also interfere with your vehicle's braking system, increasing the likelihood of accidents. Additionally, a dead battery or issues with the throttle control system can lead to unexpected vehicle behavior, making it essential to diagnose and resolve these problems promptly. If warning lights for ESP and ABS illuminate, it indicates that the cruise control system may be compromised, and further neglect could result in costly repairs or even complete system failure. Therefore, taking immediate action to investigate and fix these issues is vital for maintaining the safety and reliability of your vehicle.

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