Mercedes-Benz CLK320 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz CLK320 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
0%
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 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 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.

Troubleshooting Cruise Control Issues in a Mercedes-Benz CLK320

When troubleshooting cruise control issues in your Mercedes-Benz CLK320, it's essential to adopt a methodical diagnostic approach. Start by checking the simplest components first, such as the fuse and brake light switch, as these are common culprits for cruise control malfunctions. If the fuse is blown or the brake light switch is faulty, replacing these parts can often restore functionality. Next, examine the throttle sensor, as failures here can lead to intermittent cruise control operation. If the cruise control system displays an "inoperative" warning, this may indicate deeper electronic or mechanical issues that require further investigation. Inspect the electrical components, including circuit boards and electrolytic capacitors, for any signs of damage or wear. If these checks do not resolve the issue, consider any engine-related problems, as a check engine light can also impact cruise control performance. By following this structured approach, you can effectively diagnose and address the underlying issues affecting your vehicle's cruise control system.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz CLK320?

When dealing with cruise control malfunctions in a Mercedes-Benz CLK320, it's essential to understand the common problems that could be at play. One frequent issue is the throttle sensor, which can fail and disrupt the cruise control's ability to maintain speed. Additionally, speed sensors, whether located on the wheels or within the transmission, can also malfunction, leading to erratic cruise control behavior. Another critical component to check is the brake pedal switch; if this switch is defective, it may inadvertently deactivate the cruise control. Lastly, the ABS wheel speed sensor can be a culprit as well, as a faulty sensor can prevent the cruise control from functioning properly. If you experience issues such as the cruise control not holding speed or disengaging unexpectedly, it's advisable to inspect these components to restore proper functionality.

Why is the Cruise Control Not Working in a Mercedes-Benz CLK320?

When your Mercedes-Benz CLK320's cruise control system fails, it’s essential to address the issue promptly to avoid potential safety risks and further damage to your vehicle. A defective brake pedal switch is often the primary culprit, as it is integral to the cruise control's operation. If this switch malfunctions, it can prevent the system from engaging, leaving you without the convenience of cruise control during long drives. Additionally, a dead battery or a faulty ABS wheel speed sensor can trigger warning lights and disrupt the cruise control functionality. Neglecting these symptoms can lead to more significant problems, such as compromised braking performance or erratic vehicle behavior. Furthermore, issues with the throttle control system or a broken vacuum line in older models can also contribute to cruise control failure. It’s crucial to recognize that an ESP error can disable the cruise control even when no apparent faults exist, often stemming from issues with various sensors. Therefore, if you notice any signs of malfunction, it is advisable to seek a professional inspection to ensure your vehicle remains safe and reliable on the road.

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