2020 Mercedes-Benz GLB250 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2020 Mercedes-Benz GLB250 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 GLB250 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 GLB250 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 2020 Mercedes-Benz GLB250?

To effectively diagnose the non-functioning cruise control in your 2020 Mercedes-Benz GLB250, begin with a systematic approach that prioritizes simpler solutions before delving into more complex diagnostics. Start by checking the cruise control fuse in the fuse box, as a blown fuse is a common and easily fixable issue. Next, inspect the cruise control buttons on the steering wheel for any signs of sticking or damage, as these can hinder functionality. If the buttons are in good condition, proceed to verify the speed sensors, which play a crucial role in the cruise control system's operation. Utilizing an OBD-II scanner can help you identify any error codes that may indicate specific problems within the system. Additionally, ensure that the brake and clutch switches are functioning properly, as faulty switches can prevent the cruise control from engaging. Finally, examine the wiring and connections for any damage or corrosion that could disrupt the system. If these steps do not resolve the issue, it may be time to consult a professional mechanic or an authorized Mercedes-Benz service center for further assistance. By following this diagnostic approach, you can efficiently identify and address the root cause of your cruise control problems.

What are the common problems that could cause the cruise control to stop working in a 2020 Mercedes-Benz GLB250?

When troubleshooting the cruise control system in a 2020 Mercedes-Benz GLB250, 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, problems with the brake light switch can pose significant challenges, as this switch is crucial for disengaging the cruise control when the brake pedal is pressed; a malfunction here can lead to erratic behavior or complete failure of the system. Another potential culprit is the throttle actuator, which regulates the engine's throttle opening; if it malfunctions, the cruise control may struggle to maintain speed effectively. Furthermore, a defective cruise control module can hinder communication between various system components, resulting in operational issues. Lastly, electrical problems, such as blown fuses or wiring issues, can also impact the cruise control's functionality. By identifying and addressing these common problems, DIY enthusiasts can take steps toward restoring the cruise control system in their vehicle.

How urgent is it to address the malfunctioning cruise control in a 2020 Mercedes-Benz GLB250?

When dealing with a malfunctioning cruise control in a 2020 Mercedes-Benz GLB250, it is crucial to recognize the urgency of the situation. Cruise control is designed to enhance driving comfort by maintaining a consistent speed, but when it fails, it can lead to significant safety risks. A malfunctioning system may cause erratic speed changes, making it difficult to control the vehicle effectively, which can increase the likelihood of accidents. Additionally, ignoring these symptoms can result in further damage to the vehicle's electronic systems, leading to more costly repairs down the line. Therefore, it is essential to address any issues with the cruise control system as soon as they arise. While some minor adjustments may be attempted by DIY enthusiasts, seeking the expertise of a certified mechanic is often the best course of action to ensure a thorough diagnosis and safe resolution of the problem. Prioritizing the repair of your cruise control not only enhances your driving experience but also safeguards your safety on the road.

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