2021 Mercedes-Benz CLA45 AMG Cruise Control Isn't Working

Fixing Cruise Control Issues in 2021 Mercedes-Benz CLA45 AMG

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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
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2021 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 2021 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 cruise control issue in my 2021 Mercedes-Benz CLA45 AMG?

To effectively diagnose the cruise control issue in your 2021 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, as a blown fuse can easily disrupt functionality. Next, examine the cruise control buttons on your steering wheel for any signs of sticking or malfunction, which could prevent the system from engaging properly. If these initial checks do not reveal the problem, utilize an OBD-II scanner to identify any error codes that may indicate specific issues within the cruise control system. Following this, assess the speed sensors, as they are vital for the cruise control's operation; any malfunction here can lead to system failure. Additionally, inspect the wiring connections associated with the cruise control system for any loose or damaged wires that could be causing interruptions. Finally, if all else checks out, test the cruise control module itself, as a faulty module can be the root cause of the problem. By following this structured diagnostic approach, you can efficiently identify and address the cruise control issue in your vehicle.

What are the common problems that could cause the cruise control to stop working in a 2021 Mercedes-Benz CLA45 AMG?

When the cruise control in your 2021 Mercedes-Benz CLA45 AMG ceases to function, it can be frustrating, but understanding the common problems can guide you in diagnosing the issue. One frequent culprit is a faulty speed sensor, which is essential for the cruise control system to accurately gauge your vehicle's speed. If this sensor malfunctions, the system may fail to engage or maintain the desired speed. Another potential issue lies with the brake light switch; if this switch is defective, it can inadvertently signal the cruise control to deactivate whenever the brakes are applied, disrupting its operation. Additionally, a malfunctioning throttle actuator can hinder the cruise control's ability to adjust the throttle position, further complicating its functionality. In some cases, the cruise control module itself may be at fault, requiring repair or replacement to restore proper operation. Lastly, don’t overlook electrical problems, such as blown fuses or wiring issues, which can also impede the cruise control system. By systematically checking these components, you can identify the root cause of the problem and take the necessary steps to restore your vehicle's cruise control functionality.

How urgent is it to address the malfunctioning cruise control in a 2021 Mercedes-Benz CLA45 AMG?

Addressing a malfunctioning cruise control in your 2021 Mercedes-Benz CLA45 AMG is crucial for both safety and vehicle performance. When cruise control fails, it can lead to unpredictable speed changes, which significantly increases the risk of accidents, especially during long drives or on highways where maintaining a constant speed is essential. Ignoring this issue not only compromises your safety but can also result in more extensive damage to the vehicle's systems, leading to costly repairs that could have been avoided with timely intervention. Therefore, it is highly advisable to consult a qualified mechanic or an authorized Mercedes-Benz service center as soon as you notice any symptoms of malfunction. Taking prompt action ensures that your cruise control system operates optimally, safeguarding both your driving experience and the integrity of your vehicle.

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