2004 Mercedes-Benz C320 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2004 Mercedes-Benz C320 and How to Fix Them

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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 2004 Mercedes-Benz C320 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 2004 Mercedes-Benz C320 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 initial diagnostic steps to troubleshoot the non-functional cruise control in a 2004 Mercedes-Benz C320?

When troubleshooting the non-functional cruise control in a 2004 Mercedes-Benz C320, it's essential to start with a systematic diagnostic approach. Begin by inspecting the vehicle's fuse box for any blown fuses that may be linked to the cruise control system, specifically fuses 56, 57, and 62, which are located in the front fuse box under the hood. This initial check is crucial as blown fuses are often the simplest and quickest fix. Next, if the check engine light is illuminated on your dashboard, it may indicate underlying issues that could be affecting the cruise control's operation. In this case, utilizing an OBD2 scan tool will allow you to read any diagnostic trouble codes (DTCs) that can provide insight into the problem. By following these initial steps, you can effectively narrow down the potential causes of the cruise control malfunction and determine whether further investigation or repairs are necessary.

What are the common problems that could cause the cruise control to stop working in a 2004 Mercedes-Benz C320?

When dealing with a malfunctioning cruise control system in a 2004 Mercedes-Benz C320, it's essential to understand the common problems that could be at play. One frequent issue is a defective component or sensor that is crucial for the cruise control's operation. This could include anything from a malfunctioning throttle position sensor to a faulty brake switch, both of which can prevent the system from engaging. Additionally, a malfunction within the cruise control system itself may arise, often due to wiring issues or internal component failures that inhibit the system from being triggered. Another area to investigate is the fuse related to the cruise control system; a blown fuse can disrupt power and functionality, leading to a complete failure of the system. By identifying and addressing these common issues, DIYers can restore the cruise control functionality, ensuring a safer and more enjoyable driving experience.

How urgent is it to repair the non-functioning cruise control in a 2004 Mercedes-Benz C320?

When evaluating the urgency of repairing the non-functioning cruise control in your 2004 Mercedes-Benz C320, it's essential to recognize that while it may not pose an immediate safety threat, the implications of neglecting this issue can be significant. A malfunctioning cruise control system can lead to increased driver fatigue, especially during long drives, as it removes the convenience of maintaining a steady speed. This discomfort can distract the driver, potentially heightening the risk of accidents. Furthermore, addressing this repair promptly can enhance the vehicle's resale value; prospective buyers often view non-functional features as a sign of neglect, which could deter them from making a purchase. Therefore, while the repair may not be an emergency, it is advisable to prioritize it to ensure a safer, more comfortable driving experience and to protect the investment in your vehicle.

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