2018 Mercedes-Benz E300 Cruise Control Isn't Working

Fixing Cruise Control Issues in Your 2018 Mercedes-Benz E300

Find Repair Location
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 E300 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 E300 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 2018 Mercedes-Benz E300?

When faced with a malfunctioning cruise control system in your 2018 Mercedes-Benz E300, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, inspect the cruise control switch located on the steering wheel; any signs of damage or wear could indicate a malfunction that prevents the system from engaging. It's also crucial to verify the operation of the vehicle speed sensor, as an inaccurate reading can lead to cruise control issues. Additionally, utilize the onboard diagnostic system to check for any error codes that may shed light on the problem. Lastly, ensure that the brake light switch is functioning correctly, since a faulty switch can inadvertently disengage the cruise control when the brakes are applied. By methodically addressing these areas, you can effectively narrow down the cause of the cruise control malfunction and take the necessary steps to resolve it.

What are the common problems that could cause the cruise control to stop working in a 2018 Mercedes-Benz E300?

When the cruise control in a 2018 Mercedes-Benz E300 ceases to function, several common problems may be at play. One of the primary culprits is a faulty speed sensor, which is crucial for the system to accurately gauge the vehicle's speed. If this sensor malfunctions, the cruise control may fail to engage or maintain the desired speed. Another frequent issue arises from the brake light switch; if this switch is defective, it can disrupt the cruise control's operation since the system is designed to disengage when the brake pedal is pressed. Additionally, a malfunctioning throttle actuator can hinder the cruise control's ability to maintain a constant speed, as it directly controls the engine's throttle opening. A defective cruise control module may also be responsible, as it is essential for communication between the cruise control system and other vehicle systems. Lastly, electrical problems such as wiring issues or blown fuses can lead to system malfunctions. By understanding these common issues, DIYers can effectively diagnose and address the problems affecting their cruise control system.

How urgent is it to address the malfunctioning cruise control in my 2018 Mercedes-Benz E300?

Addressing the malfunctioning cruise control in your 2018 Mercedes-Benz E300 is of utmost urgency due to the significant safety risks it poses. A faulty cruise control system can lead to unpredictable vehicle behavior, such as sudden acceleration or deceleration, which can result in dangerous driving conditions and increase the likelihood of accidents. Additionally, neglecting this issue can adversely affect your vehicle's overall performance, leading to decreased fuel efficiency and a less comfortable driving experience. Furthermore, delaying repairs may cause further damage to the cruise control system or related components, ultimately resulting in more extensive and costly repairs. Therefore, it is crucial to prioritize the resolution of any cruise control malfunctions to ensure your safety, maintain optimal vehicle performance, and avoid escalating repair costs.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.