Mercedes-Benz C43 AMG Cruise Control Isn't Working

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

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

Troubleshooting Cruise Control Issues in a Mercedes-Benz C43 AMG

When troubleshooting cruise control issues in your Mercedes-Benz C43 AMG, start by checking the simplest components first. Begin with the cruise control switch and ensure it is functioning correctly; a faulty switch can prevent the system from engaging. Next, inspect the spiral cable in the steering wheel, as damage here can disrupt communication between the switch and the cruise control module. If these components are in good condition, move on to the throttle position sensor, which plays a crucial role in the system's operation. A malfunctioning sensor can lead to erratic behavior or complete failure of the cruise control. Additionally, examine the control module and any related sensors for signs of failure, as these are critical for the system's functionality. Lastly, check for any electrical issues, such as loose connectors or damaged wiring, which can also impede the cruise control's performance. By following this diagnostic approach, you can systematically identify and address the root cause of the cruise control malfunction, potentially saving time and money on repairs.

What Could Cause Cruise Control Issues in a Mercedes-Benz C43 AMG?

When troubleshooting cruise control issues in a Mercedes-Benz C43 AMG, it's essential to consider several common problems that could be affecting the system's performance. A primary concern is the control module, which can fail and disrupt the entire cruise control functionality. Additionally, sensor malfunctions, particularly with the throttle position sensor, can lead to erratic behavior, such as excessive fuel delivery and black exhaust emissions. Mechanical issues, including worn lower control arm bushings and ball joints, may also contribute to cruise control failures, especially in older models. Furthermore, the unique programming of the vehicle's traction control and cruise control systems can cause rear brakes to wear more quickly, potentially impacting overall performance. Regular maintenance and timely inspections of these components are crucial for ensuring the cruise control system operates smoothly, allowing DIY enthusiasts to address these issues effectively and maintain their vehicle's performance.

Why is the Cruise Control Not Working in a Mercedes-Benz C43 AMG?

When the cruise control in your Mercedes-Benz C43 AMG is not functioning, it’s crucial to address the issue promptly to ensure both your safety and the vehicle's performance. Common culprits include a failed control module, which can disrupt the entire system, or a defective brake pedal switch that may prevent the cruise control from engaging. Additionally, throttle actuation problems can hinder the system's ability to maintain speed, while issues with the ABS wheel speed sensor can lead to erratic behavior or complete failure of the cruise control. Ignoring these symptoms can not only compromise your driving experience but also lead to more significant mechanical problems down the line. Therefore, diagnosing the specific cause of the malfunction is essential for effective repair and to avoid potential safety risks associated with an unreliable cruise control system.

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Mercedes-Benz C43 AMG Cruise Control Issues & Repair Guide