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

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

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Reviewed by
Bo Fader
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 R 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.

What steps should I take to diagnose the cruise control issue in my 2021 Mercedes-Benz AMG GT R?

To effectively diagnose the cruise control issue in your 2021 Mercedes-Benz AMG GT R, 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 root cause of the cruise control issue in your vehicle.

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

When the cruise control in your 2021 Mercedes-Benz AMG GT R ceases to function, it can be frustrating, but understanding the common issues can help you diagnose the problem. One frequent culprit is a faulty speed sensor, which is essential for the cruise control system to accurately gauge your vehicle's speed. If this sensor malfunctions, the system may fail to engage or maintain the desired speed. Another potential issue lies with the brake light switch; if this switch is defective, it may not signal the cruise control system to disengage when the brake pedal is pressed, leading to operational failures. Additionally, a malfunctioning throttle actuator can disrupt the system's ability to maintain a constant speed, as it controls the engine's throttle opening. Electrical problems, such as blown fuses or wiring issues, can also impede the cruise control's functionality, as can software glitches within the vehicle's onboard computer system. By identifying these common problems, you can take the first steps toward troubleshooting and potentially resolving the cruise control issues in your AMG GT R.

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

Addressing a malfunctioning cruise control system in your 2021 Mercedes-Benz AMG GT R is not just a matter of convenience; it is a critical safety concern that should be prioritized. When cruise control fails, it can lead to unpredictable vehicle behavior, increasing the risk of accidents and compromising your driving experience. Moreover, neglecting this issue can exacerbate the problem, potentially causing further damage to the vehicle's electronic systems or other components, which could result in more extensive and costly repairs. Therefore, it is essential to have the cruise control system inspected and repaired by a qualified technician as soon as possible. By taking prompt action, you ensure not only your safety but also the longevity and performance of your vehicle.

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