2019 Mercedes-Benz SLC300 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2019 Mercedes-Benz SLC300

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Reviewed by
Aisha
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 2019 Mercedes-Benz SLC300 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 2019 Mercedes-Benz SLC300 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.

What are the steps to diagnose the non-functioning cruise control in a 2019 Mercedes-Benz SLC300?

To diagnose the non-functioning cruise control in your 2019 Mercedes-Benz SLC300, start with the simplest solutions before moving on to more intricate checks. Begin by inspecting the cruise control fuse in the fuse box, as a blown fuse can easily disrupt functionality. Next, verify that the cruise control settings on your dashboard are correctly configured, as incorrect settings can prevent activation. If these initial checks do not resolve the issue, proceed to examine the speed sensors, which are essential for the cruise control system to operate correctly. Additionally, inspect the wiring connections associated with the cruise control system for any signs of looseness or damage that could hinder performance. If everything appears intact, use a diagnostic scanner to check for any error codes that may provide further insight into the problem. Finally, test the cruise control module to ensure it is sending the appropriate signals for activation. If the cruise control remains non-functional after these steps, it may be time to consult a professional mechanic or an authorized Mercedes-Benz service center for a thorough diagnosis and repair. By following this structured approach, you can effectively troubleshoot and potentially resolve issues with your vehicle's cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2019 Mercedes-Benz SLC300?

When troubleshooting cruise control issues in a 2019 Mercedes-Benz SLC300, it's important to consider several common problems that could be at play. One of the first components to check is the speed sensor, as a malfunction here can prevent the system from maintaining the desired speed. Additionally, the brake light switch is crucial; if it's faulty, it may cause the cruise control to disengage unexpectedly when the brake pedal is pressed. Another potential culprit is the throttle actuator, which can disrupt communication between the cruise control system and the engine, leading to operational issues. Don't overlook the possibility of a blown fuse, as this can completely disable the cruise control system. Lastly, inspect the steering wheel controls, as any malfunction in the buttons or switches can hinder the functionality of the cruise control. By systematically examining these components, DIYers can identify and potentially resolve the issues affecting their vehicle's cruise control system.

How urgent is it to address the malfunctioning cruise control in my 2019 Mercedes-Benz SLC300?

Addressing the malfunctioning cruise control in your 2019 Mercedes-Benz SLC300 is of utmost importance due to the potential safety hazards it presents. A malfunction can lead to unexpected acceleration or deceleration, which significantly increases the risk of accidents on the road. Moreover, neglecting this issue can result in further damage to the cruise control system and related components, leading to more extensive and costly repairs down the line. By taking immediate action, you not only safeguard your safety but also enhance your driving experience, as a properly functioning cruise control system contributes to a more comfortable and convenient ride. Therefore, it is crucial to prioritize repairs to ensure both your safety and the optimal performance of your vehicle.

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