2021 Mercedes-Benz E350 Cruise Control Isn't Working

Fixing Cruise Control Issues in the 2021 Mercedes-Benz E350

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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 2021 Mercedes-Benz E350 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 2021 Mercedes-Benz E350 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 troubleshoot the non-functioning cruise control in a 2021 Mercedes-Benz E350?

When troubleshooting the non-functioning cruise control in a 2021 Mercedes-Benz E350, it's essential to adopt a systematic diagnostic approach. Start by checking the cruise control fuse, as a blown or damaged fuse can easily disrupt the system's functionality. Next, ensure that the cruise control settings are correctly configured according to the vehicle's manual, as incorrect settings can prevent activation. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Additionally, inspect the cruise control buttons on the steering wheel for any signs of damage or malfunction, as these controls are crucial for operation. It's also important to verify that the brake pedal switch is functioning correctly, since a faulty switch can inhibit cruise control engagement. Finally, check the vehicle speed sensor to confirm it is accurately relaying speed information to the cruise control system. By following these steps in order, you can effectively diagnose and potentially resolve the cruise control issue in your E350.

What are the common problems that could cause the cruise control to malfunction in a 2021 Mercedes-Benz E350?

When troubleshooting cruise control malfunctions in a 2021 Mercedes-Benz E350, it's essential to understand the common problems that may arise. One frequent issue is faulty speed sensors, which can lead to incorrect speed readings and disrupt the cruise control's functionality. Additionally, a malfunctioning brake light switch can prevent the system from engaging or disengaging as intended, posing a significant safety concern. Another critical component to check is the throttle actuator; if it fails, it can hinder communication between the engine and the cruise control system, resulting in erratic behavior. Electrical issues, such as blown fuses or damaged wiring, can also impact the system's performance, making it vital to inspect these components thoroughly. Lastly, software glitches within the vehicle's control module can lead to unexpected cruise control behavior, so ensuring that the software is up to date is crucial. By systematically addressing these common problems, DIYers can effectively troubleshoot and resolve cruise control issues in their E350, ensuring a safer and more reliable driving experience.

How urgent is it to address the malfunctioning cruise control in my 2021 Mercedes-Benz E350?

Addressing a malfunctioning cruise control in your 2021 Mercedes-Benz E350 is not just a matter of convenience; it is a critical safety concern that requires immediate attention. When cruise control fails, it can disrupt your ability to maintain a steady speed, increasing the likelihood of accidents on the road. Moreover, neglecting this issue can lead to more severe problems within your vehicle, as the malfunction may indicate underlying issues that could affect other systems. By addressing the cruise control malfunction promptly, you not only enhance your safety but also protect your vehicle from further damage, ensuring its longevity and optimal performance. Therefore, it is essential to prioritize this repair to maintain both your safety and the health of your vehicle.

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