Mercedes-Benz CLK55 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz CLK55 AMG and How to Fix Them

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Reviewed by
Andrew Hajjar
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 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 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz CLK55 AMG

When troubleshooting cruise control issues in your Mercedes-Benz CLK55 AMG, 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 light switch, which is crucial for the cruise control system's operation. If the brake lights are operational, proceed to test the brake switch itself, as a malfunction here can lead to unintended disengagement of the cruise control. Additionally, pay attention to any warning lights on the dashboard, such as the check engine light, as these can signal underlying engine issues that may affect cruise control functionality. By following this methodical approach, starting with the simplest checks and moving to more complex diagnostics, you can effectively identify and resolve the issues affecting your vehicle's cruise control system.

What Are the Common Issues Causing Cruise Control Failure in a Mercedes-Benz CLK55 AMG?

When diagnosing cruise control failure in a Mercedes-Benz CLK55 AMG, it's essential to consider several common issues that may be at play. One of the primary culprits is the control module, which can malfunction and disrupt the cruise control system's operation. Additionally, sensor problems are frequently encountered, as faulty sensors can prevent the cruise control from functioning correctly. The throttle system also plays a critical role; any malfunctions here can directly impact cruise control performance. Furthermore, underlying engine or transmission issues may cause the cruise control to disengage unexpectedly, highlighting the interconnected nature of vehicle systems. It's also important to note that the braking system is designed to cancel cruise control when brakes are applied, which can sometimes lead to confusion if the system seems unresponsive. Lastly, relay failures due to burnt contacts can contribute to cruise control issues, making it vital to conduct a thorough inspection. By understanding these common problems, DIY enthusiasts can better diagnose and address cruise control failures in their CLK55 AMG, ensuring a smoother driving experience.

Why is the Cruise Control Not Working in a Mercedes-Benz CLK55 AMG?

When the cruise control in your Mercedes-Benz CLK55 AMG is not functioning, it is crucial to understand the potential causes and the urgency of addressing them. A defective brake pedal switch is a common culprit, as it can prevent the cruise control from engaging, leading to a frustrating driving experience. Additionally, issues such as a dead battery or a malfunctioning ABS wheel speed sensor can disrupt the cruise control system, potentially triggering warning lights for ESP and ABS. Ignoring these symptoms can not only compromise your driving comfort but also pose safety risks, as a faulty cruise control system may lead to unexpected acceleration or deceleration. Other factors, including a blown fuse or engine-related problems, can further complicate the situation. Therefore, if you notice any signs of cruise control malfunction, it is advisable to seek professional inspection and repair promptly to ensure your vehicle remains safe and reliable on the road.

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