2018 Mercedes-Benz CLA45 AMG Cruise Control Isn't Working

Fixing Cruise Control Malfunctions in 2018 Mercedes-Benz CLA45 AMG

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Reviewed by
Andrew Hajjar
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 2018 Mercedes-Benz CLA45 AMG 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 2018 Mercedes-Benz CLA45 AMG 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 steps should I take to diagnose the non-functioning cruise control in my 2018 Mercedes-Benz CLA45 AMG?

To effectively diagnose the non-functioning cruise control in your 2018 Mercedes-Benz CLA45 AMG, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the cruise control fuse located in the fuse box, as a blown fuse is a common and easily rectifiable issue. Next, examine the cruise control buttons on your steering wheel for any signs of damage or sticking, as these can prevent the system from engaging. Following this, verify the functionality of the speed sensors on the wheels, since faulty sensors can disrupt the cruise control operation. Utilizing a diagnostic scanner to check for error codes can provide valuable insights into any underlying issues. Additionally, ensure that the brake and clutch switches are functioning correctly, as malfunctioning switches can disable the cruise control. Finally, inspect the wiring and connections associated with the cruise control system for any damage or corrosion, as these can lead to operational failures. By following this structured diagnostic approach, you can efficiently identify and address the root cause of your cruise control issues.

What are the common problems that could cause the cruise control to stop working in a 2018 Mercedes-Benz CLA45 AMG?

When the cruise control in your 2018 Mercedes-Benz CLA45 AMG ceases to function, it can be frustrating, but understanding the common problems can help you diagnose the issue. One frequent culprit is a faulty speed sensor, which is crucial for the system to accurately gauge your vehicle's speed. If this sensor malfunctions, the cruise control may fail to engage or maintain the desired speed. Another common issue is related to the brake light switch; if this switch is defective, it may not properly signal the cruise control system to disengage when the brake pedal is pressed, leading to operational failures. Additionally, problems with the throttle actuator can disrupt the system's ability to maintain a constant speed, as this component regulates the engine's throttle opening. A defective cruise control module can also be at fault, as it processes essential data to control speed. Lastly, electrical problems such as wiring issues or blown fuses can significantly impact the cruise control's functionality. By identifying these potential issues, you can take the necessary steps to troubleshoot and restore your vehicle's cruise control system.

How urgent is it to address the non-functioning cruise control in a 2018 Mercedes-Benz CLA45 AMG?

Addressing a non-functioning cruise control in your 2018 Mercedes-Benz CLA45 AMG should be a priority, even if it may not seem like an immediate safety concern. While the absence of this feature might not pose a direct threat to your safety, it can significantly affect your driving comfort, especially during long trips where maintaining a constant speed is crucial. Ignoring the problem could lead to more severe complications within the vehicle's electronic systems, potentially resulting in costly repairs down the line. Moreover, a malfunctioning cruise control can detract from the overall driving experience, making highway travel less enjoyable and more tiring. By taking the time to diagnose and fix the issue promptly, you not only restore the functionality of your vehicle but also prevent any underlying problems from escalating, ensuring a smoother and safer ride in the future.

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2018 Mercedes-Benz CLA45 AMG Cruise Control Issues & Costs