2008 Mercedes-Benz E550 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2008 Mercedes-Benz E550 and How to Fix Them

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2008 Mercedes-Benz E550 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 2008 Mercedes-Benz E550 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.

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 are the steps to diagnose the cruise control issue in a 2008 Mercedes-Benz E550?

When diagnosing a cruise control issue in a 2008 Mercedes-Benz E550, 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 in the fuse box, as a blown fuse is a common and easily fixable problem that can disrupt the system's functionality. Next, inspect the cruise control switch located on the steering wheel to ensure it is operational; a malfunctioning switch can prevent the cruise control from engaging. If these initial checks do not resolve the issue, utilize a diagnostic scanner to identify any error codes that may indicate problems with sensors or other components. Following this, test the cruise control module to confirm it is properly sending and receiving signals, as a faulty module can significantly impact performance. Additionally, examine the speed sensors, as they play a crucial role in maintaining the set speed; any faults here can lead to erratic behavior. Finally, inspect the wiring and connections associated with the cruise control system for any signs of damage or loose connections, as these can also contribute to the malfunction. By following this structured diagnostic approach, you can effectively identify and address the underlying issues affecting the cruise control system in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2008 Mercedes-Benz E550?

When troubleshooting cruise control issues in a 2008 Mercedes-Benz E550, it's essential to consider several common problems that could be at play. One of the primary culprits is a faulty brake light switch, which can prevent the cruise control from engaging if it fails to detect when the brake pedal is pressed. Additionally, issues with the speed sensor can disrupt the system, as accurate speed readings are crucial for cruise control functionality. Another potential problem is vacuum leaks, which can interfere with the system's ability to maintain a steady speed, leading to unexpected disengagement. A defective cruise control module may also be responsible for the malfunction, necessitating replacement to restore proper operation. Lastly, electrical problems, such as blown fuses or wiring issues, can significantly impact the cruise control system. By systematically addressing these common issues, DIY enthusiasts can effectively troubleshoot and resolve cruise control problems in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2008 Mercedes-Benz E550?

When it comes to the non-functioning cruise control in a 2008 Mercedes-Benz E550, understanding the urgency of the situation is crucial for any DIY enthusiast. While this issue may not present an immediate safety hazard like malfunctioning brakes or steering, it is still important to address it promptly. A functioning cruise control system enhances driving comfort, particularly on long trips, by allowing the driver to maintain a steady speed and reduce fatigue. Ignoring this problem could lead to inconvenience during highway driving, where cruise control is most beneficial. Moreover, delaying repairs might result in further complications or damage to the vehicle's systems, potentially leading to more costly repairs down the line. Therefore, while the urgency may not be as high as other critical vehicle issues, taking the initiative to fix the cruise control will ensure the overall performance and reliability of your E550, making your driving experience safer and more enjoyable.

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