2023 Mercedes-Benz C300 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2023 Mercedes-Benz C300

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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 2023 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 2023 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.

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.

What steps should I take to diagnose the non-functioning cruise control in my 2023 Mercedes-Benz C300?

To effectively diagnose the non-functioning cruise control in your 2023 Mercedes-Benz C300, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the cruise control fuse located 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 hinder the system's operation. Following this, verify the functionality of the speed sensor, since a malfunction here can disrupt the cruise control's ability to engage. 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 operating correctly, as faulty switches can prevent activation. Finally, inspect the wiring and connections associated with the cruise control system for any damage or loose connections. By methodically following these steps, you can identify the root cause of the cruise control malfunction and take appropriate action to restore its functionality.

What are the common problems that could cause the cruise control to stop working in a 2023 Mercedes-Benz C300?

When troubleshooting the cruise control system in a 2023 Mercedes-Benz C300, it's essential to understand the common problems that may lead to its malfunction. One prevalent issue 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 speed. Additionally, problems with the brake light switch can interfere with the cruise control's operation, as this switch is designed to disengage the system when the brake pedal is pressed. If the switch is malfunctioning, it may not disengage properly, causing the cruise control to stop working. Another potential culprit is a malfunctioning throttle actuator, which controls the engine's throttle opening and is crucial for maintaining a constant speed. Furthermore, a defective cruise control module can lead to operational failures, as issues with its components or connections can disrupt the entire system. Lastly, electrical problems such as wiring issues or blown fuses can significantly impact the cruise control's functionality. By identifying and addressing these common issues, you can effectively diagnose and potentially repair the cruise control system in your vehicle.

How urgent is it to address the malfunctioning cruise control in my 2023 Mercedes-Benz C300?

When it comes to the malfunctioning cruise control in your 2023 Mercedes-Benz C300, the urgency of addressing the issue cannot be overstated. A malfunctioning system can lead to unpredictable vehicle behavior, such as sudden acceleration or deceleration, which poses a significant safety risk not only to you but also to other road users. Ignoring these symptoms can result in dangerous situations that may lead to accidents or collisions. Furthermore, delaying repairs can exacerbate the problem, potentially causing additional damage to your vehicle's systems, which could lead to more extensive and costly repairs down the line. Beyond safety and financial implications, a properly functioning cruise control system enhances your driving experience, providing comfort and convenience during long journeys. Therefore, it is crucial to prioritize the repair of your cruise control to ensure your safety, prevent further complications, and maintain an enjoyable driving experience.

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