2018 Mercedes-Benz Sprinter 3500 Cruise Control Isn't Working

Cruise Control Malfunctions in 2018 Mercedes-Benz Sprinter 3500

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Reviewed by
Andrew Hajjar
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 2018 Mercedes-Benz Sprinter 3500 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 2018 Mercedes-Benz Sprinter 3500 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.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 2018 Mercedes-Benz Sprinter 3500?

When faced with a non-functional cruise control in a 2018 Mercedes-Benz Sprinter 3500, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse, as a blown fuse is a straightforward issue that can easily disrupt functionality. Next, verify the cruise control switch; a malfunctioning switch can prevent the system from engaging, so ensure it operates correctly. Following this, inspect the speed sensors, as they play a crucial role in the cruise control system's performance. If these initial checks do not resolve the issue, utilize a diagnostic scanner to identify any error codes that may indicate specific problems. Additionally, examine the brake and clutch pedal switches, ensuring they are not stuck or faulty, as these components are designed to disengage the cruise control when activated. Finally, conduct a thorough inspection of the wiring and connections associated with the cruise control system, looking for any signs of damage or corrosion that could hinder its operation. By following this structured approach, you can effectively diagnose and potentially resolve the cruise control issue in your Sprinter.

What are the common problems that could cause the cruise control to stop working in a 2018 Mercedes-Benz Sprinter 3500?

When troubleshooting the cruise control system in a 2018 Mercedes-Benz Sprinter 3500, it's essential to understand the common problems that may lead to its malfunction. One prevalent issue is a faulty speed sensor, which can hinder the system's ability to accurately gauge the vehicle's speed, preventing it from engaging or maintaining the desired speed. Additionally, problems with the brake light switch can disrupt the cruise control functionality, as this switch is designed to deactivate the system when the brakes are applied. Another potential culprit is a malfunctioning throttle actuator, which is responsible for controlling the engine's throttle opening; if it fails, the cruise control may struggle to maintain a constant speed. Furthermore, a defective cruise control module can completely disable the system, necessitating replacement for proper operation. Lastly, various electrical issues, such as wiring faults or blown fuses, can also impede the cruise control's performance. By identifying and addressing these common issues, DIY enthusiasts can effectively restore the cruise control functionality in their Sprinter 3500.

How urgent is it to address the malfunctioning cruise control in a 2018 Mercedes-Benz Sprinter 3500?

When it comes to a malfunctioning cruise control in a 2018 Mercedes-Benz Sprinter 3500, 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 on the road. For those who frequently embark on long trips or highway driving, the convenience of cruise control is invaluable, and its failure can detract from the overall driving experience. Moreover, neglecting these symptoms can lead to increased fuel consumption due to inconsistent speed management, ultimately affecting your wallet. Timely intervention not only enhances safety and driving comfort but also helps prevent further damage to the vehicle's systems, potentially saving you from costly repairs in the future. Therefore, while it may not seem like an immediate emergency, addressing cruise control malfunctions promptly is essential for maintaining the performance and safety of your Sprinter.

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