2017 Mercedes-Benz SLC300 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2017 Mercedes-Benz SLC300

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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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2017 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 2017 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 2017 Mercedes-Benz SLC300?

To diagnose the non-functioning cruise control in your 2017 Mercedes-Benz SLC300, begin with the simplest solutions before progressing to more intricate checks. Start by inspecting the cruise control fuse in the fuse box, as a blown fuse is a common and easily fixable issue. Next, examine the cruise control buttons on the steering wheel to ensure they are operational, as malfunctioning buttons can hinder functionality. Following this, verify the speed sensors, which play a crucial role in the cruise control system; faulty sensors can lead to significant malfunctions. Additionally, check the brake pedal switch, since the cruise control disengages when the brake is applied, and a defective switch may prevent it from engaging properly. If these initial checks do not resolve the issue, use a diagnostic scanner to identify any error codes that could indicate specific problems within the system. Finally, inspect the wiring and connections related to the cruise control system for any signs of damage or looseness, as faulty wiring can disrupt communication between components. By following this structured approach, you can effectively diagnose and potentially fix the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2017 Mercedes-Benz SLC300?

When troubleshooting cruise control issues in a 2017 Mercedes-Benz SLC300, it's essential to consider several common problems that could be affecting its functionality. One of the primary culprits is a faulty speed sensor, which is crucial for the system to maintain the desired speed accurately. If the speed sensor is malfunctioning, the cruise control may not engage or could disengage unexpectedly. Another potential issue is the brake light switch; if this switch is defective, it can cause the cruise control to disengage whenever the brake pedal is pressed, leading to frustrating interruptions. Additionally, problems with the throttle actuator can disrupt the communication between the cruise control system and the engine, resulting in erratic behavior or complete failure of the system. A blown fuse related to the cruise control can also prevent it from operating, so checking the fuses is a good first step in diagnosing the problem. Lastly, issues with the steering wheel controls or their wiring can impact the cruise control's functionality, making it essential to inspect these components as well. By systematically addressing these common issues, you can effectively diagnose and potentially resolve the cruise control malfunction in your SLC300.

How urgent is it to address the malfunctioning cruise control in my 2017 Mercedes-Benz SLC300?

Addressing a malfunctioning cruise control in your 2017 Mercedes-Benz SLC300 is of utmost importance due to the immediate safety risks it poses. A faulty system can lead to erratic acceleration or deceleration, increasing the likelihood of accidents and jeopardizing your safety on the road. Additionally, the inconvenience of a non-functional cruise control can detract from the overall driving experience, particularly during long trips where comfort is paramount. Ignoring these symptoms not only compromises your safety and comfort but can also lead to more severe mechanical issues, resulting in costly repairs. Therefore, it is crucial to prioritize the diagnosis and repair of your cruise control system to ensure a safe and enjoyable driving experience.

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