2017 Mercedes-Benz GLC300 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2017 Mercedes-Benz GLC300 and How to Fix Them

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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 2017 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 2017 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 steps should I take to diagnose the non-functioning cruise control in my 2017 Mercedes-Benz GLC300?

To effectively diagnose the non-functioning cruise control in your 2017 Mercedes-Benz GLC300, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the cruise control fuse in the fuse box, as a blown fuse is a common and easily rectifiable issue. Next, examine the cruise control buttons on the steering wheel for any signs of damage or sticking, as these can prevent the system from engaging. Following this, verify the functionality of the speed sensors located on the wheels, since faulty sensors can disrupt the cruise control operation. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Additionally, ensure that the brake and clutch switches are functioning correctly, as malfunctioning switches can disable the cruise control feature. Finally, inspect the wiring and connections associated with the cruise control system for any damage or corrosion, as compromised wiring can lead to system failure. By following this structured diagnostic approach, you can efficiently identify and address the root cause of your cruise control issues.

What are the common problems that could cause the cruise control to stop working in a 2017 Mercedes-Benz GLC300?

When troubleshooting the cruise control system in a 2017 Mercedes-Benz GLC300, it's essential to understand the common problems that may lead to its malfunction. One of the primary culprits is a faulty brake light switch, which can prevent the system from engaging if it fails to detect when the brake pedal is pressed. Additionally, issues with the speed sensor can disrupt the system's ability to maintain a constant speed, leading to erratic behavior. Another potential problem is a malfunctioning throttle actuator, which directly affects the cruise control's capacity to regulate speed effectively. Electrical issues, such as blown fuses or wiring faults, can also impede the cruise control's operation, making it crucial to inspect the vehicle's electrical system. Lastly, software glitches within the vehicle's control module can cause unexpected failures in the cruise control system. By identifying and addressing these common issues, DIY enthusiasts can effectively troubleshoot and restore functionality to the cruise control in their GLC300.

How urgent is it to address the malfunctioning cruise control in my 2017 Mercedes-Benz GLC300?

Addressing a malfunctioning cruise control system in your 2017 Mercedes-Benz GLC300 is of utmost urgency due to the significant safety risks it poses. A faulty cruise control can lead to unexpected changes in speed, increasing the likelihood of accidents and compromising your safety on the road. Additionally, a malfunctioning system can negatively impact your vehicle's overall performance, leading to decreased fuel efficiency and a less comfortable driving experience. Ignoring these symptoms not only risks your safety but can also result in further damage to the cruise control system and related components, ultimately leading to more expensive repairs. Furthermore, in some areas, driving with known mechanical issues can result in legal repercussions. Therefore, it is crucial to address any cruise control malfunctions promptly to ensure your safety, maintain optimal vehicle performance, and avoid potential legal issues.

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