Mercedes-Benz C250 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz C250 and How to Fix Them

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
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25% chance it's the
Control Module
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Mercedes-Benz C250 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 Mercedes-Benz C250 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz C250

When troubleshooting cruise control issues in your Mercedes-Benz C250, it's essential to adopt a systematic diagnostic approach. Begin by inspecting the basic components of the cruise control system, such as the Control Module, Sensor, and Throttle. These parts are often the culprits behind malfunctioning cruise control. If you encounter an "inoperative" warning message on your dashboard, this indicates a more significant issue that requires immediate attention. Pay close attention to intermittent functionality; if the cruise control engages and then drops out, it may point to underlying electronic or mechanical problems. Checking the fuses—specifically fuses 56, 57, and 62—and ensuring that your brake lights are operational is crucial, as these can directly affect cruise control performance. Additionally, if the ABS and ETS warning lights are illuminated, this could signal a malfunction with the brake light switch, necessitating further investigation. By following this structured approach, you can effectively identify and address the issues impacting your cruise control system, enhancing your DIY troubleshooting experience.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz C250?

When diagnosing cruise control malfunctions in a Mercedes-Benz C250, it's essential to consider several common problems that could be at play. A failed control module, sensor, or switch is often the primary suspect, as these components are crucial for the proper functioning of the cruise control system. Additionally, throttle actuation issues, particularly stemming from a faulty throttle position sensor, can cause the engine's computer to mismanage fuel delivery, potentially resulting in black exhaust emissions. Another frequent culprit is a defective brake pedal switch, which can prevent the cruise control from engaging altogether. Other factors to investigate include a dead battery or a malfunctioning ABS wheel speed sensor, both of which can trigger warning lights and affect the cruise control's operation. Furthermore, problems with the control stalk or the connection between the cruise control system and the throttle body may also lead to malfunctions. If you encounter error messages like "Cruise Control Inoperative," it's a clear indication that further investigation is needed. By understanding these common issues, DIY enthusiasts can more effectively troubleshoot and resolve cruise control problems in their Mercedes-Benz C250.

Why is the Cruise Control Not Working in a Mercedes-Benz C250?

When the cruise control in your Mercedes-Benz C250 is not functioning, it’s crucial to address the issue promptly to ensure your safety and the vehicle's performance. Common culprits include a malfunctioning cruise control module, a defective brake pedal switch, or issues with the throttle control system. Neglecting these symptoms can lead to more significant problems, such as unexpected acceleration or loss of control while driving. Additionally, if you encounter error messages like "cruise control and speedtronic inoperative," it indicates a need for immediate attention. Other factors, such as a dead battery or faulty ABS wheel speed sensors, can also contribute to the malfunction. Regularly checking fuses and ensuring that brake lights are operational can prevent further complications. Remember, if the Electronic Stability Program (ESP) detects errors, it may disable the cruise control, making it essential to inspect related components like the steering angle sensor and yaw switch. By addressing these issues quickly, you can maintain the functionality of your cruise control system and ensure a safer driving experience.

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