2005 Mercedes-Benz SLK350 Cruise Control Isn't Working

Fixing Cruise Control Issues in 2005 Mercedes-Benz SLK350

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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 2005 Mercedes-Benz SLK350 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 2005 Mercedes-Benz SLK350 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 cruise control issue in a 2005 Mercedes-Benz SLK350?

When diagnosing a cruise control issue in a 2005 Mercedes-Benz SLK350, it's essential to adopt a systematic approach that begins with the simplest solutions before progressing to more complex diagnostics. Start by checking the cruise control fuse, as a blown fuse can easily disrupt the system's functionality. Next, inspect the cruise control switch located on the steering wheel; a malfunctioning switch can often be the culprit behind cruise control failures. If these initial checks do not reveal the problem, utilize a diagnostic scanner to identify any error codes from the vehicle's onboard computer, which can provide valuable insights into the issue. Additionally, verify the operation of the speed sensors, as they are critical for the cruise control system's performance. It's also important to examine the wiring and connections associated with the cruise control system for any signs of damage or corrosion, as faulty wiring can lead to malfunctions. Finally, if all else fails, test the cruise control module itself to ensure it is functioning correctly. By following this structured diagnostic approach, you can effectively identify and address the underlying issues affecting the cruise control system in your SLK350.

What are the common problems that could cause the cruise control to stop working in a 2005 Mercedes-Benz SLK350?

When dealing with cruise control issues in a 2005 Mercedes-Benz SLK350, it's essential to understand the common problems that may arise. One of the primary culprits is a defective component or sensor within the cruise control system, which can prevent it from functioning correctly. This could include issues with the throttle position sensor or the brake light switch, both of which are critical for the system's operation. Additionally, electrical problems such as faulty wiring or poor connections can disrupt the cruise control's functionality. These electrical issues may manifest as intermittent failures or complete inoperability, making it crucial to inspect the wiring harness and connectors for any signs of wear or damage. By identifying these common problems, DIY enthusiasts can take the necessary steps to troubleshoot and potentially fix the cruise control system, ensuring a smoother driving experience.

How urgent is it to address the non-functioning cruise control in a 2005 Mercedes-Benz SLK350?

When it comes to the non-functioning cruise control in a 2005 Mercedes-Benz SLK350, addressing the problem should not be overlooked, even if it may not seem urgent at first glance. While the absence of cruise control does not directly compromise the vehicle's safety or drivability, it can significantly detract from the overall driving experience, particularly on long journeys where maintaining a steady speed is beneficial. Ignoring this issue could lead to increased frustration during extended drives, as the convenience of cruise control is lost. Moreover, what may initially appear as a minor inconvenience could potentially signal underlying mechanical problems that, if left unaddressed, might escalate into more serious and costly repairs. Therefore, it is wise to prioritize the repair of the cruise control system to ensure a smoother driving experience and to mitigate the risk of further complications down the road.

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2005 Mercedes-Benz SLK350 Cruise Control Issues & Repairs