2021 Mercedes-Benz GLC63 AMG S Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2021 Mercedes-Benz GLC63 AMG S

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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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2021 Mercedes-Benz GLC63 AMG S 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 2021 Mercedes-Benz GLC63 AMG S 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 steps should I take to diagnose the non-functioning cruise control in my 2021 Mercedes-Benz GLC63 AMG S?

When diagnosing the non-functioning cruise control in your 2021 Mercedes-Benz GLC63 AMG S, it's essential to adopt a systematic approach that begins with the simplest solutions before progressing to more complex diagnostics. Start 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 for any signs of sticking or malfunction, as these can prevent the system from engaging properly. Following this, verify the operation of the speed sensor, which is crucial for maintaining your vehicle's speed. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Additionally, ensure that the brake and clutch switches are functioning correctly, as these components are designed to disengage the cruise control when necessary. Finally, inspect the wiring and connections associated with the cruise control system for any damage or loose connections that could be causing the problem. By methodically following these steps, you can effectively identify the root cause of the cruise control issue and determine whether it requires a simple fix or professional assistance.

What are the common problems that could cause the cruise control to malfunction in a 2021 Mercedes-Benz GLC63 AMG S?

When diagnosing cruise control malfunctions in a 2021 Mercedes-Benz GLC63 AMG S, it's crucial to understand the common problems that may arise. A faulty speed sensor is often at the forefront, as it can disrupt the system's ability to maintain a steady speed, leading to erratic behavior or complete failure. Additionally, a malfunctioning brake light switch can prevent the cruise control from engaging or cause it to disengage unexpectedly, which can be frustrating during long drives. Throttle control issues, such as a defective throttle position sensor or actuator, can also hinder the cruise control's performance, making it difficult to regulate speed effectively. Electrical problems, including wiring faults or blown fuses, can further complicate matters, as they may interrupt the communication between the cruise control components. Lastly, software glitches in the vehicle's onboard computer can lead to erratic cruise control behavior, necessitating a software update or reset. By being aware of these potential issues, DIY enthusiasts can take proactive steps to troubleshoot and maintain the cruise control system, ensuring a smoother driving experience.

How urgent is it to repair the non-functioning cruise control on a 2021 Mercedes-Benz GLC63 AMG S?

Repairing the non-functioning cruise control on your 2021 Mercedes-Benz GLC63 AMG S should be a priority due to several critical factors. First and foremost, safety is paramount; a malfunctioning cruise control system can lead to erratic speed changes, increasing the risk of accidents, especially during long drives on highways. Additionally, the comfort and convenience that cruise control provides cannot be overlooked, as it significantly reduces driver fatigue on extended journeys. By addressing this issue promptly, you not only enhance your driving experience but also ensure that you remain alert and in control. Furthermore, neglecting to repair the cruise control can adversely affect the vehicle's resale value. Prospective buyers are likely to be deterred by a car with unresolved issues, which could lead to a lower selling price. Therefore, it is essential to act swiftly to repair the cruise control system, ensuring your safety, enhancing comfort, and preserving the value of your vehicle.

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2021 Mercedes-Benz GLC63 AMG S Cruise Control Issues