2003 Mercedes-Benz E55 AMG Cruise Control Isn't Working

Fixing Cruise Control Issues in 2003 Mercedes-Benz E55 AMG

Find Repair Location
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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2003 Mercedes-Benz E55 AMG 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 2003 Mercedes-Benz E55 AMG 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 initial diagnostic steps to troubleshoot the non-functional cruise control in a 2003 Mercedes-Benz E55 AMG?

When troubleshooting the non-functional cruise control in a 2003 Mercedes-Benz E55 AMG, start with the simplest diagnostic steps to efficiently identify the issue. Begin by checking the cruise control fuse; a blown or damaged fuse can easily disrupt the system's operation. Next, inspect the cruise control switch located on the steering wheel to ensure it is functioning correctly, as a malfunctioning switch can prevent engagement. It's also essential to verify the brake pedal switch, since a faulty switch can inadvertently signal that the brakes are applied, disabling the cruise control. Additionally, examine the vehicle's speed sensors, which are critical for the cruise control system to function properly; any issues here can lead to a lack of response. Finally, utilize the onboard diagnostic system to check for any error codes that may provide insights into underlying problems. By systematically addressing these areas, you can effectively narrow down the cause of the cruise control malfunction and take appropriate action to resolve it.

What are the common problems that could cause the cruise control to stop working in a 2003 Mercedes-Benz E55 AMG?

When dealing with cruise control issues in a 2003 Mercedes-Benz E55 AMG, it's essential to understand the common problems that may be at play. One frequent culprit is a faulty brake light switch, which can prevent the cruise control from engaging by failing to signal when the brake pedal is pressed. Additionally, a defective cruise control module can disrupt the entire system's functionality, leading to a complete failure of the cruise control feature. Another potential issue is vacuum leaks, which can interfere with the system's ability to maintain a steady speed. Furthermore, a malfunctioning speed sensor may hinder the cruise control's capacity to accurately gauge the vehicle's speed, resulting in operational problems. Lastly, electrical issues, such as blown fuses or wiring faults, can also impact the cruise control system's performance. By identifying and addressing these common problems, DIY enthusiasts can work towards restoring the cruise control functionality in their vehicle.

How urgent is it to address the non-functioning cruise control in a 2003 Mercedes-Benz E55 AMG?

Addressing the non-functioning cruise control in a 2003 Mercedes-Benz E55 AMG is crucial for both safety and vehicle performance. A malfunctioning cruise control system not only diminishes the convenience of maintaining a steady speed during long drives but may also signal deeper issues within the vehicle's electronic systems or sensors. These underlying problems could potentially affect other critical components, leading to more significant mechanical failures if left unresolved. For DIY enthusiasts, it’s essential to recognize that neglecting this issue could result in increased repair costs and inconvenience during travel. By promptly diagnosing and fixing the cruise control, you not only enhance your driving experience but also safeguard against potential safety risks associated with erratic vehicle behavior. Therefore, taking immediate action to troubleshoot and repair the cruise control system is highly advisable to ensure the overall reliability and safety of your Mercedes-Benz E55 AMG.

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.