Mercedes-Benz E500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz E500 and How to Fix Them

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 Mercedes-Benz E500 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 E500 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz E500

When troubleshooting cruise control issues in a Mercedes-Benz E500, it's essential to adopt a systematic diagnostic approach. Start by checking the simplest components, such as the control module, sensor, and throttle, as these are often the culprits behind malfunctioning cruise control. If the system works intermittently, this may indicate deeper electronic or mechanical problems that require further investigation. Pay attention to any warning messages on the instrument cluster, particularly if you see an "inoperative" alert, as this can signal multiple underlying issues that need addressing. Additionally, if the ABS and ETS lights are illuminated, it could point to a faulty brake light switch, which can disrupt cruise control functionality even if the brake lights appear to be operational. Don't overlook the possibility of a blown fuse or a loose link rod connecting the cruise control actuator to the throttle, as these can also lead to failures. By methodically assessing these components, you can effectively identify and resolve the issues affecting your cruise control system.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz E500?

When dealing with cruise control malfunctions in a Mercedes-Benz E500, it's essential to understand the common problems that may arise. One frequent culprit is a defective brake pedal switch, which can prevent the cruise control from engaging properly. Additionally, a dead battery can disrupt the electrical systems, including cruise control functionality. Another critical component to check is the ABS wheel speed sensor; if this sensor fails, it can trigger warning lights for both the ESP and ABS systems, indicating a broader issue that may affect cruise control. Drivers may also encounter various warning messages, such as "Run Flat Inoperative" or "ABS ESP Inoperative," which can signal underlying problems with the vehicle's systems. Furthermore, flashing cruise control lights on the speedometer cluster often point to a malfunction within the cruise control system itself. Lastly, intermittent activation of the ESP light, accompanied by messages about "Electronic Stability Control Unavailable," can also impact cruise control performance. By diagnosing these common issues, DIYers can effectively troubleshoot and potentially resolve cruise control malfunctions in their Mercedes-Benz E500.

Why is the Cruise Control Not Working in a Mercedes-Benz E500?

When the cruise control in your Mercedes-Benz E500 fails to operate, it’s crucial to address the issue promptly, as neglecting it can lead to safety risks and further complications. Common culprits include a malfunctioning control module, faulty sensors, or defective switches, all of which can disrupt the cruise control functionality. Additionally, throttle actuation problems may prevent the system from engaging properly, while a failing ABS sensor can not only disable cruise control but also impact other critical systems like ABS and stability control. A malfunctioning brake light switch is another potential issue, particularly if warning lights such as SRS and ABS are illuminated on your dashboard. Ignoring these symptoms can lead to more significant vehicle damage and compromise your safety on the road. Therefore, it’s essential to diagnose and rectify these issues as soon as they arise to ensure your vehicle operates smoothly and safely.

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.