2020 Mercedes-Benz GLC300 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2020 Mercedes-Benz GLC300

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Reviewed by
Devin Cabugcal
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 GLC300 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 GLC300 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 take when the cruise control isn't working on a 2020 Mercedes-Benz GLC300?

When faced with a malfunctioning cruise control system in your 2020 Mercedes-Benz GLC300, it's crucial to adopt a systematic diagnostic approach. Start by checking the cruise control fuse in the fuse box; a blown fuse is a common and easily fixable issue that can disrupt the system's functionality. Next, verify the operation of the speed sensors, as these components are vital for the cruise control to engage properly. If the speed sensors are functioning, turn your attention to the brake pedal switch, which must be operational; a faulty switch can inadvertently disable the cruise control. Additionally, inspect the steering wheel controls to ensure that the buttons responsible for activating the cruise control are not damaged or malfunctioning. Finally, consider using a diagnostic scanner to check for any error codes that may provide insight into underlying issues. By following these steps, you can effectively troubleshoot the cruise control system and potentially restore its functionality without the need for professional help.

What are the common problems that could cause the cruise control to stop working in a 2020 Mercedes-Benz GLC300?

When the cruise control in your 2020 Mercedes-Benz GLC300 stops functioning, it can be frustrating, but understanding the common problems can help you diagnose the issue effectively. One of the primary culprits is a faulty speed sensor, which is crucial for the cruise control system to maintain the desired speed. If the speed sensor is malfunctioning, it may not relay accurate information to the system, causing it to fail. Another frequent issue is a defective brake light switch; if this switch is not working correctly, it can inadvertently disengage the cruise control when you press the brake pedal. Additionally, problems with the throttle actuator can disrupt the communication between the cruise control and the engine, leading to operational failures. Electrical issues, such as blown fuses or wiring problems, can also hinder the cruise control's performance, as can software glitches within the vehicle's computer system. By systematically checking these components, you can identify and potentially resolve the issues affecting your cruise control, allowing you to enjoy a smoother driving experience once again.

How urgent is it to address the malfunctioning cruise control in a 2020 Mercedes-Benz GLC300?

Addressing a malfunctioning cruise control in a 2020 Mercedes-Benz GLC300 is of utmost importance due to the immediate safety risks it poses. A malfunction can lead to unexpected acceleration or deceleration, which can significantly increase the likelihood of accidents on the road. Promptly fixing this issue not only safeguards your well-being but also prevents the potential for more severe damage to the vehicle's components, which could result in costly repairs down the line. Moreover, a properly functioning cruise control enhances your driving experience, providing convenience and comfort during long journeys. Therefore, it is crucial to prioritize the repair of your cruise control system to ensure both safety and optimal vehicle performance.

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