2021 Mercedes-Benz GLA35 AMG Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2021 Mercedes-Benz GLA35 AMG

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Reviewed by
Aisha
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 GLA35 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 2021 Mercedes-Benz GLA35 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.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

What steps should I take to diagnose the cruise control issue in my 2021 Mercedes-Benz GLA35 AMG?

To effectively diagnose the cruise control issue in your 2021 Mercedes-Benz GLA35 AMG, start with the simplest solutions before progressing to more complex diagnostics. Begin by checking the cruise control fuse, as a blown fuse can easily disrupt functionality. Next, inspect the cruise control buttons on your steering wheel to ensure they are operational, since faulty buttons can lead to malfunctions. If these initial checks do not resolve the issue, utilize an OBD-II scanner to identify any error codes that may indicate specific problems within the cruise control system. Following this, examine the speed sensors, as they are essential for the cruise control's operation; any faults here can significantly impact performance. Additionally, inspect the wiring connections associated with the cruise control system for any signs of damage or loose connections, as these can also cause disruptions. Finally, test the cruise control module itself to confirm it is functioning correctly. If you still cannot identify the problem after these steps, it may be time to consult a professional mechanic or an authorized Mercedes-Benz service center for a comprehensive diagnosis and repair. By following this structured approach, you can systematically address potential issues and restore your vehicle's cruise control functionality.

What are the common problems that could cause the cruise control to malfunction in a 2021 Mercedes-Benz GLA35 AMG?

When dealing with cruise control malfunctions in a 2021 Mercedes-Benz GLA35 AMG, it's essential to understand the common problems that may arise. One frequent issue is sensor malfunction, particularly with the speed or radar sensors, which can lead to incorrect speed readings and disrupt the system's operation. Additionally, electrical problems such as blown fuses or wiring faults can impede the cruise control's functionality, making it crucial to inspect these components for any signs of damage. Software glitches are another potential culprit, as they can cause erratic behavior in the system; ensuring that your vehicle's software is up to date can help mitigate this risk. Furthermore, a faulty brake light switch can prevent the cruise control from engaging or cause it to disengage unexpectedly, so checking this switch is advisable. Lastly, issues with the throttle control system can hinder the cruise control's ability to maintain a steady speed, necessitating a thorough examination of this component. By understanding these common problems, DIY enthusiasts can better diagnose and address cruise control issues, ensuring a safer and more reliable driving experience.

How urgent is the repair for the non-functioning cruise control in a 2021 Mercedes-Benz GLA35 AMG?

When considering the urgency of repairing the non-functioning cruise control in your 2021 Mercedes-Benz GLA35 AMG, it is essential to recognize the potential consequences of delaying this repair. A malfunctioning cruise control system can compromise your safety on the road, as it may lead to erratic speed changes that could result in dangerous driving conditions. Additionally, the absence of this feature can detract from your overall driving comfort, especially during long journeys where maintaining a steady speed is crucial for relaxation and fatigue management. Furthermore, neglecting to address this issue could negatively impact your vehicle's resale value; prospective buyers often shy away from cars with unresolved mechanical problems. Therefore, while the urgency may vary based on personal driving habits, prioritizing the repair of your cruise control system is advisable to ensure safety, enhance comfort, and protect your investment in the vehicle.

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2021 Mercedes-Benz GLA35 AMG Cruise Control Issues & Fixes