Mercedes-Benz C450 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz C450 AMG and How to Fix Them

Find Repair Location
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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Mercedes-Benz C450 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 C450 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 C450 AMG

When troubleshooting cruise control issues in your Mercedes-Benz C450 AMG, begin by checking the simplest components first. Start with the brake light switch, as a malfunction here can prevent the cruise control from engaging. Ensure that your brake lights are functioning properly; if they are not, this could indicate a blown fuse or a faulty switch that needs replacement. Next, inspect the cruise control fuse in the fuse box, as a blown fuse can easily disrupt the system. If these initial checks do not resolve the issue, consider examining the control module and associated sensors for any signs of malfunction. Pay attention to any warning lights on the dashboard, such as the ETS or ABS lights, as these can provide clues about underlying electronic or mechanical issues affecting the cruise control system. By following this diagnostic approach, you can systematically identify and address the root cause of your cruise control problems, ensuring a more effective and efficient repair process.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz C450 AMG?

When dealing with cruise control malfunctions in a Mercedes-Benz C450 AMG, it's essential to understand the common problems that may arise. One of the primary culprits could be defective components within the cruise control system, such as the cruise control switch or module, which can prevent the system from engaging properly. Additionally, if your vehicle is equipped with the Distronic Plus system, any issues here may trigger an error message on the dashboard, indicating that the system is inoperative. Another frequent issue is a faulty brake pedal switch; if this switch fails, it can disrupt the cruise control's functionality, as the system relies on it to disengage when the brakes are applied. Electrical problems, including blown fuses or damaged wiring in the cruise control circuit, can also lead to malfunctions, as can issues with the throttle body. Lastly, a malfunctioning cruise control amplifier may require replacement to restore proper operation. By understanding these potential issues, DIYers can effectively diagnose and address cruise control problems in their Mercedes-Benz C450 AMG.

Why is the Cruise Control Not Working in a Mercedes-Benz C450 AMG?

When the cruise control in your Mercedes-Benz C450 AMG is not functioning, it’s crucial to understand the potential causes and the urgency of resolving them. A malfunctioning cruise control system can stem from several issues, including a failed control module, defective brake pedal switch, or problems with the throttle actuation system. These components are integral to the system's operation, and neglecting to address them can lead to safety risks, such as unexpected acceleration or difficulty maintaining speed. Additionally, a faulty ABS wheel speed sensor or a blown fuse can also disrupt cruise control functionality. If the brake pedal switch fails, the system may not engage, leaving you without this convenient feature. Furthermore, engine-related issues or a check engine light can impact the cruise control's performance, making it essential to diagnose and fix these problems promptly. By addressing these symptoms early, you not only ensure your vehicle operates safely but also prevent potential damage that could lead to more costly repairs down the line.

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.

Mercedes-Benz C450 AMG Cruise Control Issues & Repairs