2021 Mercedes-Benz GLB250 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2021 Mercedes-Benz GLB250

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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 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 2021 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 are the initial steps to diagnose the non-functioning cruise control in a 2021 Mercedes-Benz GLB250?

When diagnosing the non-functioning cruise control in a 2021 Mercedes-Benz GLB250, it's essential to adopt a methodical diagnostic approach. Start by checking the cruise control settings to ensure the system is activated and set to the desired speed, as incorrect settings can often be the simplest explanation for the issue. Next, inspect the cruise control buttons on the steering wheel for any signs of damage or malfunction, as faulty buttons can prevent the system from engaging. Following this, verify the speed sensors, which are critical for the cruise control's operation; ensure they are functioning correctly and relaying accurate information. Utilizing a diagnostic scanner to check for error codes can provide insights into specific problems affecting the cruise control system. Additionally, inspect the fuse box for any blown fuses that may disrupt the cruise control's functionality. Finally, consider testing the cruise control module itself, as a malfunctioning module may require replacement. By following these steps, you can effectively diagnose and address the issues with your vehicle's cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2021 Mercedes-Benz GLB250?

When dealing with cruise control issues in a 2021 Mercedes-Benz GLB250, it's essential to understand the common problems that may arise. One frequent culprit is a faulty speed sensor, which can disrupt the system's ability to detect the vehicle's speed accurately, preventing it from engaging or maintaining the desired speed. Another potential issue is a malfunctioning brake light switch; if this component fails, it may send incorrect signals to the cruise control system, causing it to disengage unexpectedly even when the brakes are not applied. Additionally, problems with the throttle actuator can interfere with communication between the cruise control and the engine, leading to difficulties in maintaining speed. A blown fuse can also be a straightforward yet often overlooked reason for cruise control failure, as it can completely disable the system. Lastly, software glitches within the vehicle's onboard computer may require a reset or update to restore proper functionality. If you experience any of these issues, it is advisable to consult a qualified mechanic or authorized service center for a thorough inspection and repair.

How urgent is it to address the non-functioning cruise control in a 2021 Mercedes-Benz GLB250?

When it comes to a non-functioning cruise control in a 2021 Mercedes-Benz GLB250, the urgency of addressing the issue cannot be overstated. While it may not seem like an immediate emergency, neglecting this problem can lead to significant safety risks and potential damage to the vehicle's systems. Cruise control is designed to enhance driving comfort and efficiency, and its failure may indicate underlying issues that could compromise the vehicle's overall performance. For DIY enthusiasts, it’s crucial to recognize that a malfunctioning cruise control system could be symptomatic of more serious problems, such as electrical faults or sensor failures. Therefore, it is advisable to conduct a thorough inspection of the system, checking for any visible signs of wear or damage, and consulting the vehicle’s manual for troubleshooting tips. If the issue persists, seeking assistance from a qualified mechanic or an authorized Mercedes-Benz service center is essential to ensure that the problem is accurately diagnosed and resolved, ultimately safeguarding both the vehicle's functionality and the driver's safety on the road.

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