2003 Mercedes-Benz CLK320 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2003 Mercedes-Benz CLK320 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 2003 Mercedes-Benz CLK320 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 2003 Mercedes-Benz CLK320 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 2003 Mercedes-Benz CLK320?

When troubleshooting the non-functional cruise control in a 2003 Mercedes-Benz CLK320, it's essential to adopt a systematic diagnostic approach. Start by checking the fuse associated with the cruise control system, as a blown fuse can often be the simplest explanation for the malfunction. Next, inspect the cruise control switch located on the steering wheel to ensure it is operational; a faulty switch can prevent the system from engaging. Following this, examine the brake pedal switch, which is crucial since the cruise control is designed to disengage when the brakes are applied. If the brake switch is stuck or malfunctioning, it could be the culprit. Additionally, verify the vehicle speed sensor, as it provides critical data for the cruise control system to function correctly. Finally, scanning the vehicle's onboard computer for any error codes can help identify more complex issues that may not be immediately visible. By following these steps, you can effectively diagnose and potentially resolve the cruise control problem in your CLK320.

What are the common problems that could cause the cruise control to stop working in a 2003 Mercedes-Benz CLK320?

When troubleshooting the cruise control system in a 2003 Mercedes-Benz CLK320, it's essential to understand the common problems that could lead to its failure. One of the primary culprits is a faulty brake light switch, which is crucial for disengaging the cruise control when the brake pedal is pressed. If this switch malfunctions, it can prevent the system from engaging properly. Another potential issue is a defective cruise control module, which is responsible for maintaining speed; if it fails, the cruise control will not function as intended. Additionally, vacuum leaks within the cruise control system can disrupt its operation, leading to a loss of functionality. A faulty speed sensor can also be problematic, as it affects the system's ability to accurately maintain the set speed. Lastly, electrical issues, including problems with wiring or fuses, can significantly impact the cruise control system. By identifying and addressing these common issues, you can effectively restore the cruise control functionality in your vehicle.

How urgent is it to repair the non-functioning cruise control in a 2003 Mercedes-Benz CLK320?

When evaluating the urgency of repairing the non-functioning cruise control in your 2003 Mercedes-Benz CLK320, it is essential to recognize the potential safety risks associated with a malfunctioning system. Cruise control is designed to maintain a steady speed, which can significantly enhance driving safety, especially on long journeys or highways. If the system fails, it may lead to erratic speed changes, increasing the risk of accidents. Additionally, a functioning cruise control system contributes to driver comfort by reducing fatigue during extended drives. Without it, you may find yourself more tired and less focused, which can further compromise safety. Moreover, neglecting this repair could impact the vehicle's resale value; prospective buyers often view non-functioning features as a sign of poor maintenance. Therefore, while it may not be an immediate emergency, addressing the cruise control issue promptly is advisable to ensure a safer, more comfortable driving experience and to protect your investment in the vehicle.

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