Mercedes-Benz GLB35 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz GLB35 AMG and How to Fix Them

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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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 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 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.

A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.

Troubleshooting Cruise Control Issues in a Mercedes-Benz GLB35 AMG

When troubleshooting cruise control issues in a Mercedes-Benz GLB35 AMG, it's crucial to follow a structured diagnostic approach that prioritizes simpler fixes before addressing more complex problems. Begin by examining the brake light switch, as a malfunction here can disrupt the cruise control system even if the brake lights seem operational. Next, check the ABS wheel speed sensors, since a fault in any of these sensors can lead to cruise control failure. If these components are functioning correctly, turn your attention to the actuator under the hood, looking for signs of low resistance that may indicate an underlying electrical issue. Additionally, inspect the spiral cable within the steering wheel, as any damage can hinder communication between the cruise control switch and the system. Finally, consider the possibility of electrical issues, such as faulty connectors, which can also affect the cruise control's performance. By systematically addressing these areas, you can effectively diagnose and resolve cruise control problems in your GLB35 AMG, ensuring a smoother driving experience.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz GLB35 AMG?

When dealing with cruise control malfunctions in a Mercedes-Benz GLB35 AMG, it's essential to consider several common problems that could be at the root of the issue. A defective component or sensor, such as those involved in the cruise control system, can disrupt its functionality. Additionally, circuit malfunctions may prevent the system from operating correctly, so inspecting the wiring and connections is crucial. Another frequent culprit is the ABS sensor; if any of the wheel speed sensors fail, the cruise control may become disabled. It's also wise to check for blown fuses, as these can interrupt the power supply to the system. The brake pedal sensor plays a vital role in engaging cruise control, so ensuring its proper operation is necessary. Furthermore, issues with the throttle control system can hinder cruise control performance, and in older models, a broken vacuum line may also be a factor. By systematically identifying and addressing these potential issues, DIYers can effectively troubleshoot and restore the cruise control functionality in their vehicle.

Why is it Critical to Fix the Non-Working Cruise Control in a Mercedes-Benz GLB35 AMG?

Fixing the non-working cruise control in a Mercedes-Benz GLB35 AMG is not just a matter of convenience; it is a critical safety concern that demands immediate attention. When cruise control fails, drivers are forced to manually manage their speed, which can lead to fatigue and distraction, significantly increasing the risk of accidents on the road. Moreover, the convenience of cruise control during long drives cannot be overstated, as it allows for a more relaxed driving experience, reducing the physical strain on the driver. Additionally, a malfunctioning cruise control system may signal deeper issues within the vehicle that could compromise its overall performance. Addressing this problem promptly not only enhances safety and comfort but also helps maintain the vehicle's resale value, as potential buyers are likely to be deterred by any non-functional features. Ignoring the symptoms of a faulty cruise control system can lead to further damage and costly repairs down the line, making it imperative for owners to act swiftly. In summary, the urgency of fixing the cruise control in a Mercedes-Benz GLB35 AMG is underscored by the need to ensure safety, enhance driving comfort, and protect the vehicle's integrity and value.

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