2019 Mercedes-Benz C300 Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2019 Mercedes-Benz C300

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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 2019 Mercedes-Benz C300 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 2019 Mercedes-Benz C300 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 steps to diagnose the cruise control issue in a 2019 Mercedes-Benz C300?

When diagnosing a cruise control issue in a 2019 Mercedes-Benz C300, it's essential to adopt a systematic approach that begins with the simplest solutions before progressing to more complex diagnostics. Start by checking the cruise control fuse, as a blown fuse can easily disrupt functionality. Next, inspect the cruise control buttons on the steering wheel to ensure they are responsive and not malfunctioning. If these initial checks do not reveal the problem, utilize a diagnostic scanner to identify any error codes from the vehicle's onboard computer, which can provide valuable insights into the issue. Following this, verify the speed sensors, as they are critical for the cruise control system's operation; faulty sensors can lead to significant problems. Additionally, examine the wiring connections associated with the cruise control system for any signs of damage or loose connections, as these can also impede functionality. Finally, if all else fails, test the cruise control module itself to confirm it is working correctly. By following this structured diagnostic approach, you can effectively identify and address the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2019 Mercedes-Benz C300?

When the cruise control in your 2019 Mercedes-Benz C300 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 accurately gauge the vehicle's speed. If this sensor malfunctions, the system may fail to engage or maintain the desired speed. Additionally, issues with the brake light switch can disrupt the cruise control, as this switch is designed to deactivate the system when the brakes are applied. Another potential problem is a malfunctioning throttle actuator, which controls the engine's throttle and is essential for maintaining speed. If the cruise control module itself is defective, it may need replacement to restore functionality. Lastly, electrical problems such as wiring issues or blown fuses can also prevent the cruise control from operating correctly. By identifying these common issues, you can take the first steps toward troubleshooting and potentially resolving the cruise control problem in your vehicle.

How urgent is it to address the malfunctioning cruise control in my 2019 Mercedes-Benz C300?

Addressing the malfunctioning cruise control in your 2019 Mercedes-Benz C300 is of utmost importance due to the safety risks it poses. A malfunctioning system can lead to unexpected acceleration or deceleration, which can be dangerous while driving, especially on highways. Additionally, the inconvenience of a faulty cruise control can detract from the comfort of long drives, making your journeys less enjoyable. Ignoring this issue not only compromises your safety but can also lead to further wear and tear on your vehicle's components, resulting in more expensive repairs down the line. By promptly diagnosing and repairing the cruise control system, you can maintain your vehicle's performance and efficiency, ensuring a smoother and safer driving experience. Therefore, it is crucial to take action as soon as you notice any symptoms of malfunction to avoid potential risks and complications on the road.

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