1995 Mercedes-Benz E420 Cruise Control Isn't Working

Fixing cruise control issues in the 1995 Mercedes-Benz E420

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Reviewed by
Devin Cabugcal
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 1995 Mercedes-Benz E420 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 1995 Mercedes-Benz E420 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.

What are the steps to diagnose the non-functioning cruise control in a 1995 Mercedes-Benz E420?

To effectively diagnose the non-functioning cruise control in your 1995 Mercedes-Benz E420, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the fuse associated with the cruise control system, as a blown fuse can often be the simplest explanation for the malfunction. Next, examine the cruise control switch for any visible damage or operational issues, as this component is crucial for activating the system. Following this, assess the brake pedal switch, which is designed to disengage the cruise control when the brake is applied; a malfunction here can prevent the system from functioning correctly. Additionally, test the speed sensor to ensure it is accurately relaying information to the cruise control system, as incorrect signals can disrupt its operation. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Don’t forget to inspect the vacuum lines for leaks or damage, as these can significantly impact the cruise control's performance. If these steps do not resolve the issue, it may be prudent to consult a professional mechanic who specializes in Mercedes-Benz vehicles for a thorough diagnosis and repair. By following this structured approach, you can efficiently identify and address the root cause of your cruise control problem.

What are the common problems that could cause the cruise control to stop working in a 1995 Mercedes-Benz E420?

When dealing with a malfunctioning cruise control system in a 1995 Mercedes-Benz E420, 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, vacuum leaks within the system can disrupt its ability to maintain speed, leading to inconsistent performance. Another potential issue is a defective cruise control module, which may require replacement if it is not functioning correctly. Speed sensor problems can also arise, causing inaccuracies in speed readings that directly impact cruise control operation. Lastly, electrical issues, such as blown fuses or wiring faults, can hinder the system's performance. By identifying and addressing these common issues, DIYers can effectively troubleshoot and restore the cruise control functionality in their vehicle.

How urgent is it to repair the non-functioning cruise control in a 1995 Mercedes-Benz E420?

While the non-functioning cruise control in a 1995 Mercedes-Benz E420 may not seem urgent, neglecting this issue can lead to several potential consequences that warrant timely attention. First and foremost, the convenience of cruise control significantly enhances the driving experience, especially during long trips or highway driving, where maintaining a consistent speed can alleviate driver fatigue. Additionally, a malfunctioning cruise control system can be a red flag for underlying issues within the vehicle, which, if left unaddressed, could escalate into more serious and costly repairs. Furthermore, having a fully operational cruise control system can positively impact the vehicle's resale value, as it reflects a well-maintained car with all features functioning properly. Therefore, while it may not be an immediate safety concern, addressing the cruise control issue promptly can prevent further complications and ensure the overall health of your vehicle.

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