2008 Mercedes-Benz CLK350 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2008 Mercedes-Benz CLK350 and How to Fix Them

Find Repair Location
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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2008 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 2008 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.

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.

What are the steps to diagnose the cruise control issue in a 2008 Mercedes-Benz CLK350?

When diagnosing a cruise control issue in a 2008 Mercedes-Benz CLK350, it's crucial to follow a methodical approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by inspecting the cruise control fuse, as a blown fuse can easily disrupt the system's operation. Next, examine the cruise control switch on the steering wheel; if this switch is malfunctioning, it can lead to significant cruise control problems. If these preliminary checks do not uncover the issue, utilize a diagnostic scanner to retrieve any error codes from the vehicle's onboard computer, which can provide critical information about the underlying problem. Additionally, assess the functionality of the speed sensors, as they are vital for the cruise control system to engage and maintain speed accurately. It's also essential to inspect the wiring and connections related to the cruise control system for any signs of damage or corrosion, as faulty wiring can impede performance. Lastly, test the cruise control module to confirm it is functioning correctly, as a defective module can result in ongoing issues. By adhering to this structured diagnostic process, you can effectively identify and resolve cruise control problems in your CLK350, ensuring a smoother driving experience.

What are the common problems that could cause the cruise control to stop working in a 2008 Mercedes-Benz CLK350?

When diagnosing cruise control issues in a 2008 Mercedes-Benz CLK350, it's essential to consider several common problems that could be at play. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging since the system is designed to disengage when the brake pedal is pressed. Additionally, issues with the speed sensor can disrupt the cruise control's functionality, as it relies on accurate speed readings to maintain the desired speed. Another potential issue is vacuum leaks within the system, which can hinder the cruise control's ability to sustain a steady speed. Furthermore, a defective cruise control module may also be responsible for the malfunction, as it is a critical component of the system. Lastly, electrical problems, such as blown fuses or wiring issues, can significantly impact the cruise control's performance. By systematically addressing these common issues, DIY enthusiasts can effectively troubleshoot and potentially resolve the cruise control problems in their CLK350.

How urgent is it to address the non-functioning cruise control in a 2008 Mercedes-Benz CLK350?

When it comes to a non-functioning cruise control in your 2008 Mercedes-Benz CLK350, addressing the issue should be a priority, even if it may not seem like an immediate emergency. The cruise control system is designed to enhance your driving experience by maintaining a steady speed, which not only reduces fatigue during long trips but also contributes to better fuel efficiency. However, a malfunctioning system could signal deeper problems within the vehicle's electrical components or sensors, which, if left unchecked, might lead to more significant issues down the line. Ignoring this problem could compromise the overall performance and safety of your vehicle, potentially resulting in costly repairs or even dangerous driving conditions. Therefore, while it may be tempting to postpone repairs, taking prompt action to diagnose and fix the cruise control system will not only restore convenience but also safeguard your vehicle's integrity and your driving experience.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2008 Mercedes-Benz CLK350 Cruise Control Issues | RepairPal