1998 Mercedes-Benz E320 Cruise Control Isn't Working

Fixing Cruise Control Issues in 1998 Mercedes-Benz E320

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Reviewed by
Bo Fader
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 1998 Mercedes-Benz E320 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 1998 Mercedes-Benz E320 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.

What are the initial diagnostic steps to troubleshoot the non-functional cruise control in a 1998 Mercedes-Benz E320?

When troubleshooting the non-functional cruise control in a 1998 Mercedes-Benz E320, it's essential to adopt a systematic diagnostic approach. Start by checking the fuse associated with the cruise control system, as a blown fuse can often be the simplest explanation for the malfunction. Next, inspect the cruise control switch located on the steering wheel to ensure it is operational; a faulty switch can prevent the system from engaging. It's also crucial to verify that the brake lights are functioning correctly, as a malfunctioning brake light switch can inadvertently disable the cruise control. Additionally, examine the throttle cable and linkage for any obstructions or damage that might hinder the system's performance. Finally, if the issue persists, consider scanning the vehicle's onboard computer for error codes that could provide further insight into the problem. By following these steps, you can effectively diagnose and potentially resolve the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 1998 Mercedes-Benz E320?

When troubleshooting cruise control issues in a 1998 Mercedes-Benz E320, it's essential to consider several common problems that could be at play. One of the primary culprits is a failed control module, sensor, or switch, which can disrupt the system's functionality. Additionally, throttle actuation problems may prevent the cruise control from engaging properly. It's also important to check for a blown fuse or a defective brake pedal switch, as these components are frequently responsible for cruise control malfunctions. If the brake lights are not functioning correctly, this could indicate a faulty brake switch, which can also interfere with the cruise control system. Other potential issues include a bad wheel speed sensor, steering angle sensor, or yaw switch, all of which can contribute to the failure of the cruise control. By systematically addressing these common problems, you can effectively diagnose and restore the cruise control functionality in your vehicle.

How urgent is it to address the non-functioning cruise control in a 1998 Mercedes-Benz E320?

When it comes to the non-functioning cruise control in a 1998 Mercedes-Benz E320, understanding the urgency of the repair is crucial for maintaining both safety and vehicle performance. While a malfunctioning cruise control may not present an immediate safety hazard, it can lead to increased driver fatigue during long trips, as the driver must constantly monitor and adjust their speed. Additionally, neglecting this issue could result in further complications with related systems, potentially escalating repair costs and affecting the overall driving experience. Therefore, while it may not be the most critical issue to address, it is advisable to prioritize the repair of the cruise control system to ensure the vehicle operates smoothly and efficiently, ultimately enhancing your driving comfort and safety.

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