2021 Mercedes-Benz GLB35 AMG Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2021 Mercedes-Benz GLB35 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 GLB35 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 GLB35 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 steps should I take to diagnose the non-functioning cruise control in my 2021 Mercedes-Benz GLB35 AMG?

When diagnosing the non-functioning cruise control in your 2021 Mercedes-Benz GLB35 AMG, it's crucial to follow a methodical diagnostic approach that prioritizes simpler solutions before tackling more complex issues. Begin by checking the cruise control fuse, as a blown fuse is a common and easily rectifiable problem that can disrupt the system's operation. Next, inspect the cruise control buttons on the steering wheel to ensure they are responsive and functioning correctly, since malfunctioning buttons can lead to operational failures. Utilizing a diagnostic scanner to check for error codes in the vehicle's computer system can provide critical insights into any underlying issues. Additionally, verify the functionality of the speed sensors, which are essential for cruise control engagement; faulty sensors can prevent the system from working altogether. It’s also important to examine the wiring connections related to the cruise control system for any signs of damage or corrosion, as poor connections can disrupt the necessary signals. If these steps do not resolve the issue, consulting a professional mechanic or an authorized Mercedes-Benz service center for a comprehensive diagnosis and repair may be necessary. By adhering to this structured approach, you can effectively identify and address the root cause of your cruise control malfunction.

What are the common problems that could cause the cruise control to stop working in a 2021 Mercedes-Benz GLB35 AMG?

When troubleshooting the cruise control system in a 2021 Mercedes-Benz GLB35 AMG, it's essential to understand the common problems that may lead to its malfunction. One prevalent issue is a faulty speed sensor, which can disrupt the system's ability to accurately gauge the vehicle's speed, preventing it from engaging or maintaining the desired speed. Additionally, the brake light switch plays a critical role; if this switch is malfunctioning, it may incorrectly signal the cruise control to disengage when the brake pedal is pressed, leading to operational issues. Another potential culprit is the throttle actuator, which controls the engine's throttle opening; if it fails, the cruise control may struggle to maintain speed effectively. Furthermore, a defective cruise control module can hinder communication between various system components, resulting in a complete failure of the cruise control function. Lastly, electrical problems such as wiring issues or blown fuses can also impede the system's performance. By identifying and addressing these common issues, you can effectively diagnose and potentially repair the cruise control system, restoring its functionality for a smoother driving experience.

How urgent is it to address the malfunctioning cruise control in a 2021 Mercedes-Benz GLB35 AMG?

Addressing a malfunctioning cruise control in your 2021 Mercedes-Benz GLB35 AMG is not just a matter of convenience; it is a critical safety concern that requires immediate attention. A malfunction can lead to unexpected acceleration or deceleration, significantly increasing the risk of accidents on the road. Moreover, the enjoyment and ease of driving are compromised when this feature does not function correctly, detracting from the overall driving experience. Ignoring these symptoms can also lead to more severe issues, potentially causing damage to other vehicle components, which may result in costly repairs down the line. Therefore, it is essential to prioritize the repair of your cruise control system to ensure both your safety and the longevity of your vehicle.

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