Mercedes-Benz 500E Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz 500E and How to Fix Them

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
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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 Mercedes-Benz 500E 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 Mercedes-Benz 500E 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz 500E

When troubleshooting cruise control issues in your Mercedes-Benz 500E, it's essential to adopt a methodical diagnostic approach. Begin by checking for any warning messages on the instrument cluster, as these can provide immediate insight into the system's status. Next, inspect the control module and associated sensors, as these electronic components are crucial for proper functionality. If no obvious issues are found, examine the fuses and switches, as blown fuses or faulty brake lights can often lead to cruise control malfunctions. Additionally, consider the E-GAS module, which plays a significant role in controlling the cruise system; checking for error codes here can reveal underlying problems. It's also wise to assess any engine-related issues, as a check engine light may indicate that the cruise control system is being affected by broader vehicle performance problems. Lastly, be mindful of driving conditions that could impact cruise control operation, such as inclines or specific warning lights like the ASR. By following this structured approach, you can effectively identify and resolve cruise control issues, ensuring a smoother driving experience.

What Are the Common Causes of Cruise Control Malfunction in a Mercedes-Benz 500E?

When troubleshooting cruise control malfunctions in a Mercedes-Benz 500E, it's essential to understand the common problems that may arise. One of the primary culprits is a defective brake pedal switch, which can prevent the cruise control system from engaging properly. Additionally, a dead battery can disrupt the electrical systems, leading to cruise control issues. Another significant factor is the ABS wheel speed sensor; if this sensor is faulty, it may trigger warning lights for both the Electronic Stability Program (ESP) and Anti-lock Braking System (ABS), indicating a broader issue that could affect cruise control functionality. Furthermore, problems with the cruise control components themselves—such as the control module, throttle, or wiring—can also lead to malfunctions. To effectively diagnose these issues, using a diagnostic scanner is recommended to identify specific faults in the system. Conducting a thorough visual inspection of the components and testing the cruise control switch and module can help pinpoint the problem, allowing for necessary repairs or replacements to restore proper function.

Why is the Cruise Control Not Working in a Mercedes-Benz 500E?

When the cruise control in your Mercedes-Benz 500E is not functioning, it’s crucial to understand the potential causes and the urgency of addressing them. A defective brake pedal switch is often the primary culprit, as it can prevent the cruise control from engaging. Additionally, a dead battery or a malfunctioning ABS wheel speed sensor can disrupt the system's operation. Problems with the throttle control system or ABS may also contribute to this issue, leading to a frustrating driving experience. In older models, a broken vacuum line could be the reason behind the malfunction. While adverse weather conditions like rain may not directly affect cruise control, they can trigger error messages that complicate the situation. Ignoring these symptoms can pose safety risks, as malfunctioning cruise control can lead to loss of vehicle control. Therefore, it is advisable to seek professional inspection and repair promptly to ensure your vehicle remains safe and reliable on the road.

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