2002 Mercedes-Benz SLK320 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2002 Mercedes-Benz SLK320 and How to Fix Them

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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 2002 Mercedes-Benz SLK320 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 2002 Mercedes-Benz SLK320 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 2002 Mercedes-Benz SLK320?

When diagnosing the non-functioning cruise control in a 2002 Mercedes-Benz SLK320, it's crucial to follow a structured diagnostic approach that begins with the simplest checks. Start by inspecting the control module, as failures in this component are often the primary reason for cruise control issues. Next, evaluate the sensors and switches linked to the cruise control system, since malfunctions here can also prevent it from operating correctly. After that, assess the throttle actuation, as any irregularities in this area can significantly affect the cruise control's performance. Finally, check the fuses, particularly fuses 56, 57, and 62 located in the front fuse box under the hood, since blown fuses can lead to a complete system failure. By systematically addressing these potential problems, you can effectively diagnose and resolve the issue, restoring your vehicle's cruise control functionality.

What are the common problems that could cause the cruise control to stop working in a 2002 Mercedes-Benz SLK320?

When diagnosing why the cruise control system in a 2002 Mercedes-Benz SLK320 may not be functioning, it's essential to consider several common issues that could be at play. One frequent culprit is a faulty brake light switch, which can disrupt the engagement of the cruise control, preventing it from activating properly. Additionally, a defective cruise control module can lead to significant operational failures, rendering the system ineffective. Vacuum leaks are another critical factor, as they can interfere with the system's ability to maintain speed. Electrical problems, including faulty wiring or blown fuses, can also impede the cruise control's functionality. Furthermore, a malfunctioning speed sensor may prevent the system from accurately maintaining a set speed, while issues with the throttle position sensor or throttle body can hinder the cruise control's ability to regulate speed effectively. By systematically checking these components, DIY enthusiasts can identify and resolve the underlying issues affecting the cruise control system.

How urgent is it to repair the non-functioning cruise control in a 2002 Mercedes-Benz SLK320?

While the non-functioning cruise control in a 2002 Mercedes-Benz SLK320 may not seem like an immediate concern, it is important to recognize the implications of delaying repairs. Cruise control enhances driving comfort, particularly on long journeys, and its absence can lead to fatigue during extended highway travel. If the malfunction stems from minor issues such as a blown fuse or a faulty brake switch, these repairs can often be tackled easily and affordably, allowing you to restore functionality without significant disruption. However, if the underlying problem is more complex, potentially involving engine components or safety systems, it becomes crucial to address it promptly. Ignoring these symptoms could lead to more severe safety risks or costly repairs down the line. Therefore, while the urgency may vary, it is advisable to assess the situation carefully and prioritize repairs that could impact your driving experience and vehicle safety.

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2002 Mercedes-Benz SLK320 Cruise Control Issues & Repairs