2021 Mercedes-Benz AMG GT Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2021 Mercedes-Benz AMG GT

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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 AMG GT 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 AMG GT 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 cruise control issue in my 2021 Mercedes-Benz AMG GT?

To effectively diagnose the cruise control issue in your 2021 Mercedes-Benz AMG GT, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by examining the cruise control fuse, as a blown fuse can easily disrupt functionality. Next, inspect the cruise control buttons on the steering wheel to ensure they are operational, since faulty buttons can lead to malfunctions. If these initial checks do not reveal the problem, utilize an OBD-II scanner to identify any error codes that may indicate specific issues within the cruise control system. Following this, verify the performance of the speed sensors, as they are essential for the cruise control's operation. Additionally, inspect the wiring connections associated with the cruise control system for any signs of damage or loose connections that could hinder performance. Finally, test the cruise control module to confirm it is sending the correct signals to the vehicle's computer. By following this structured diagnostic approach, you can efficiently identify and address the underlying issues affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2021 Mercedes-Benz AMG GT?

When dealing with cruise control issues in a 2021 Mercedes-Benz AMG GT, it's essential to understand the common problems that may be at play. A faulty speed sensor is often the culprit, as it can hinder the system's ability to accurately gauge the vehicle's speed, preventing cruise control from engaging or maintaining speed. Additionally, the brake light switch can cause significant disruptions; if this switch malfunctions, it may not properly signal the cruise control system to disengage when the brake pedal is pressed, leading to operational failures. Another potential issue lies with the throttle actuator, which is responsible for regulating the engine's throttle opening. If this component is not functioning correctly, it can impede the cruise control's ability to sustain a constant speed. Electrical problems, such as blown fuses or wiring issues, can also disrupt the cruise control system, as can software glitches within the vehicle's onboard computer. Identifying and addressing these issues through careful diagnosis and repair can help restore the cruise control functionality, ensuring a smoother driving experience.

How urgent is it to address the malfunctioning cruise control in a 2021 Mercedes-Benz AMG GT?

Addressing a malfunctioning cruise control system in your 2021 Mercedes-Benz AMG GT is of utmost importance due to the significant safety risks it poses. A faulty cruise control can lead to unexpected acceleration or deceleration, which can create dangerous driving conditions and increase the likelihood of accidents. Moreover, neglecting this issue can exacerbate the problem, potentially causing further damage to the vehicle's components and resulting in more extensive and costly repairs down the line. Therefore, it is crucial to act promptly and consult with a certified mechanic or an authorized Mercedes-Benz service center. By doing so, you not only ensure your safety and that of others on the road but also maintain the optimal performance of your vehicle, preventing additional expenses in the future.

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