2003 Mercedes-Benz CL500 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2003 Mercedes-Benz CL500 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 2003 Mercedes-Benz CL500 cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty sensor can lead to incorrect readings, causing issues with engine performance or triggering warning lights on the dashboard.
  • Control Module: A faulty control module can result in 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 acceleration and poor engine 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 2003 Mercedes-Benz CL500 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 2003 Mercedes-Benz CL500?

To effectively diagnose cruise control issues in your 2003 Mercedes-Benz CL500, start with the simplest components. Begin by inspecting the brake pedal switch, as a malfunction here can prevent the cruise control from engaging. Next, check the battery's condition; a dead or weak battery can also disrupt the cruise control system. If these initial checks do not reveal any problems, move on to the ABS wheel speed sensor, as faults in this sensor can significantly impact cruise control functionality. Following this, examine the cruise control switch and the various control modules associated with the system, including the steering column control module and throttle actuator valve. It’s also essential to scan all control modules for any fault codes that may indicate underlying issues. Additionally, ensure that your wheel and tire combination adheres to the recommended rolling circumference difference of 1.5%, as deviations can affect performance. If these steps do not resolve the issue, it may be time to consult a professional service team for further assistance. This methodical approach not only helps in identifying the problem but also empowers you to tackle the issue with confidence.

How urgent is it to repair the non-functioning cruise control in a 2003 Mercedes-Benz CL500?

Repairing the non-functioning cruise control in a 2003 Mercedes-Benz CL500 should be treated with a sense of urgency, as neglecting this issue can lead to more significant problems down the line. A malfunctioning cruise control system may not only diminish your driving experience but can also signal underlying issues that could affect the vehicle's overall performance and safety. For instance, a defective brake pedal switch or a blown fuse could indicate electrical problems that, if left unaddressed, might escalate into more costly repairs. Additionally, ensuring that your brake lights are functioning properly is crucial, as this is directly linked to the cruise control system's operation. By using a code reader to diagnose any trouble codes, you can quickly identify the root cause of the failure and take appropriate action. Addressing these issues promptly not only enhances your driving comfort but also ensures the safety and reliability of your vehicle, making it a worthwhile DIY project for any car owner.

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