Mercedes-Benz C55 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz C55 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
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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 C55 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 C55 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 C55 AMG

When troubleshooting cruise control issues in your Mercedes-Benz C55 AMG, it's essential to adopt a systematic diagnostic approach. Start by checking the simplest components, such as the fuses and brake lights, as blown fuses or faulty brake switches are common culprits that can easily disrupt the cruise control functionality. If these elements are functioning correctly, move on to inspect the control module, sensors, and switches, as failures in these areas are often responsible for more complex issues. Pay attention to any warning messages on the instrument cluster, as they can provide valuable insights into the system's status. If the cruise control operates intermittently, this may indicate underlying electronic or mechanical problems that require further investigation. Should you encounter persistent issues, consulting with a professional service team or engaging with online forums can provide additional support and shared experiences from other C55 AMG owners, helping you to pinpoint and resolve the problem effectively.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz C55 AMG?

When dealing with cruise control malfunctions in a Mercedes-Benz C55 AMG, it's essential to understand the common problems that may arise. A failed control module, sensor, or switch is often at the heart of the issue, as these components are crucial for the proper functioning of the cruise control system. Additionally, throttle actuation problems can disrupt the system, preventing it from maintaining speed. The control stalk, which is responsible for engaging the cruise control, may also be faulty, along with the connections to the throttle body or the multi-function relay. Other factors to consider include a defective brake pedal switch, which can inadvertently disable the cruise control, or issues stemming from a dead battery or faulty ABS wheel speed sensor. It's also wise to check for a blown fuse, malfunctioning brake lights, or engine-related problems, as these can all contribute to cruise control failure. In some cases, the cruise control module itself may need attention, whether through replacement or repair methods like re-soldering components. By systematically diagnosing these potential issues, DIYers can effectively troubleshoot and resolve cruise control malfunctions in their Mercedes-Benz C55 AMG.

Why is the Cruise Control Not Working in a Mercedes-Benz C55 AMG?

When the cruise control in your Mercedes-Benz C55 AMG is not functioning, it’s crucial to understand the potential causes and the urgency of resolving them. A failed control module, sensor, or switch can disrupt the system, leading to unsafe driving conditions. For instance, if the throttle position sensor malfunctions, it may cause the engine to overcompensate with fuel, resulting in black exhaust and indicating a deeper issue that could affect engine performance. Additionally, a defective brake pedal switch is a common culprit that can disable cruise control, and neglecting this can lead to further complications. Other components, such as the throttle control system, ABS, or even a blown fuse, may also be at fault. Ignoring these symptoms not only compromises your driving safety but can also lead to significant damage to your vehicle. Therefore, it’s essential to diagnose and address the specific cause of the cruise control malfunction promptly to ensure your Mercedes-Benz C55 AMG operates safely and efficiently.

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