2020 Mercedes-Benz A35 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2020 Mercedes-Benz A35 AMG and How to Fix Them

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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 2020 Mercedes-Benz A35 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 2020 Mercedes-Benz A35 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.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 2020 Mercedes-Benz A35 AMG?

When faced with a non-functional cruise control in your 2020 Mercedes-Benz A35 AMG, start by checking the cruise control fuse, as a blown or damaged fuse can often be the simplest fix. Next, verify that the cruise control settings are correctly configured in the vehicle's settings menu, ensuring that the system is activated. If these initial checks do not resolve the issue, use a diagnostic scanner to look for any error codes that may indicate a deeper problem within the cruise control system. Additionally, inspect the cruise control buttons on the steering wheel for any signs of damage or malfunction, as stuck or broken buttons can prevent the system from engaging. Finally, while driving, attempt to engage the cruise control to see if it responds; this practical test can help you determine if the system is operational or if further investigation is needed. By systematically following these steps, you can effectively diagnose and potentially resolve the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2020 Mercedes-Benz A35 AMG?

When the cruise control in your 2020 Mercedes-Benz A35 AMG ceases to function, there are several common issues you can troubleshoot. Start by checking the speed sensor, as a faulty sensor can disrupt the system's ability to detect your vehicle's speed, preventing it from engaging or maintaining speed. Next, inspect the brake light switch; if this switch is malfunctioning, it may not allow the cruise control to activate or disengage properly when the brake pedal is pressed. Additionally, consider the throttle actuator, which is responsible for controlling the engine's throttle opening; any malfunction here can hinder the cruise control's performance. It's also wise to examine the cruise control module itself, as a defect in this component can interrupt communication between the system's parts. Lastly, look for any electrical issues, such as wiring problems or blown fuses, that could be affecting the cruise control's operation. By systematically checking these components, you may be able to identify and resolve the issue without needing to consult a technician.

How urgent is it to address the malfunctioning cruise control in my 2020 Mercedes-Benz A35 AMG?

Addressing a malfunctioning cruise control in your 2020 Mercedes-Benz A35 AMG is not just a matter of convenience; it is a critical safety concern that requires immediate attention. When cruise control fails, it can disrupt your ability to maintain a steady speed, increasing the likelihood of accidents, especially on highways where consistent speed is essential. Moreover, neglecting this issue can lead to more severe problems within the vehicle's systems, potentially resulting in costly repairs that could have been avoided with timely intervention. By prioritizing the repair of your cruise control, you not only enhance your driving safety but also contribute to the overall health and longevity of your vehicle, ensuring it operates at its best for years to come. Therefore, if you notice any signs of malfunction, it is imperative to act swiftly to mitigate risks and preserve your car's performance.

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