2018 Mercedes-Benz C43 AMG Cruise Control Isn't Working

Fix Cruise Control Issues in Your 2018 Mercedes-Benz C43 AMG

Find Repair Location
Reviewed by
Bo Fader
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 2018 Mercedes-Benz C43 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 2018 Mercedes-Benz C43 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.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 2018 Mercedes-Benz C43 AMG?

When faced with a non-functional cruise control in a 2018 Mercedes-Benz C43 AMG, it's important to approach the troubleshooting process methodically. Start by checking the cruise control fuse, as a blown or damaged fuse can easily disrupt the system's operation. Next, verify that the cruise control settings are correctly configured on the dashboard and steering wheel controls, ensuring that nothing is inadvertently preventing activation. Inspect the cruise control buttons for any signs of physical damage or malfunction, as these components are critical for proper functionality. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues that may not be immediately visible. Additionally, examine the vehicle speed sensor, as its proper functioning is essential for the cruise control system to operate effectively. Finally, ensure that the brake and clutch switches are working correctly, as these switches are designed to disengage the cruise control when necessary. By following these steps, you can systematically diagnose and address the issues affecting your cruise control system, potentially restoring its functionality without the need for professional assistance.

What are the common problems that could cause the cruise control to stop working in a 2018 Mercedes-Benz C43 AMG?

When dealing with cruise control issues in a 2018 Mercedes-Benz C43 AMG, it's essential to understand the common problems that may arise. One frequent culprit is a faulty speed sensor, which can disrupt the system's ability to maintain the desired speed. Additionally, a malfunctioning brake light switch can cause the cruise control to disengage unexpectedly, as the system is designed to turn off when the brake pedal is pressed. Another area to investigate is the throttle actuator; if it is not functioning correctly, the cruise control may struggle to adjust the vehicle's speed as needed. Electrical problems, such as blown fuses or damaged wiring, can also interfere with the cruise control's operation, so checking the vehicle's electrical system is crucial. Lastly, a malfunctioning control module may prevent the cruise control from receiving the necessary signals to operate effectively. By systematically diagnosing these components, DIY enthusiasts can identify and address the root cause of the cruise control failure, potentially restoring its functionality without the need for professional assistance.

How urgent is it to address the malfunctioning cruise control in my 2018 Mercedes-Benz C43 AMG?

When it comes to your 2018 Mercedes-Benz C43 AMG, addressing a malfunctioning cruise control system is not just a matter of convenience; it is a critical safety concern. A malfunction can lead to unexpected acceleration or deceleration, creating hazardous driving conditions that could endanger you and others on the road. Moreover, issues with the cruise control may signal deeper electronic system or sensor problems, which can compromise your vehicle's overall performance and drivability. Ignoring these symptoms can also result in decreased fuel efficiency and increased wear on your vehicle's components, leading to more costly repairs down the line. Therefore, it is essential to act promptly and have the issue diagnosed by a qualified mechanic to prevent further damage and ensure your vehicle operates safely and efficiently. Prioritizing this repair not only safeguards your driving experience but also contributes to the long-term health of your Mercedes-Benz.

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.