2017 Mercedes-Benz C43 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2017 Mercedes-Benz C43 AMG and How to Fix Them

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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 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 2017 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 steps to diagnose the cruise control issue in a 2017 Mercedes-Benz C43 AMG?

When diagnosing a cruise control issue in a 2017 Mercedes-Benz C43 AMG, it's crucial to follow a methodical diagnostic approach that prioritizes simpler solutions before tackling more complex problems. Begin by checking the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, inspect the cruise control buttons on the steering wheel to ensure they are operational, since faulty buttons can lead to malfunctions. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues within the onboard computer. Additionally, verify the functionality of the speed sensors, as they are critical for the cruise control system's operation. It's also important to examine the wiring connections for any signs of damage or corrosion, as poor connections can hinder performance. Finally, test the cruise control module to confirm it is working correctly. If these steps do not resolve the issue, seeking assistance from a professional mechanic or an authorized Mercedes-Benz service center is recommended for further diagnosis and repair. By following this structured approach, you can effectively identify and address cruise control problems in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2017 Mercedes-Benz C43 AMG?

When troubleshooting the cruise control system in a 2017 Mercedes-Benz C43 AMG, it's essential to consider several common problems that could be at play. A faulty speed sensor is often the first suspect, as it plays a crucial role in relaying the vehicle's speed to the cruise control system. If this sensor malfunctions, the system may fail to engage or maintain the desired speed. Additionally, issues with the brake light switch can disrupt the cruise control's operation; since the system is designed to disengage when the brake pedal is pressed, a faulty switch may prevent this from happening, leading to unexpected behavior. Another potential culprit is the throttle actuator, which controls the engine's throttle opening. If this component is not functioning correctly, it can hinder the cruise control's ability to maintain a steady speed. Furthermore, a defective cruise control module can also be responsible for the system's failure, as it processes critical data needed for speed control. Lastly, electrical problems such as wiring issues or blown fuses can significantly impact the cruise control system's performance. By systematically checking these components, DIY enthusiasts can effectively diagnose and potentially resolve the issues affecting their vehicle's cruise control functionality.

How urgent is it to address the malfunctioning cruise control in my 2017 Mercedes-Benz C43 AMG?

When it comes to your 2017 Mercedes-Benz C43 AMG, addressing a malfunctioning cruise control system is not just a matter of convenience; it is a critical safety concern that requires immediate attention. A malfunctioning cruise control can disrupt your ability to maintain a steady speed, increasing the risk of accidents on the road. Moreover, neglecting this issue can lead to further complications, potentially causing damage to other vehicle components, which may result in more extensive and costly repairs down the line. By prioritizing the repair of your cruise control system, you not only enhance your driving safety but also protect the overall performance and longevity of your vehicle. Therefore, it is essential to act swiftly to resolve any cruise control issues to ensure a safe and reliable driving experience.

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