Mercedes-Benz CLA35 AMG Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz CLA35 AMG and How to Fix Them

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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
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25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a Mercedes-Benz CLA35 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 Mercedes-Benz CLA35 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.

When the vehicle speed sensor fails or the wiring harness prevents signal transmission, the speedometer is the first thing that will stop functioning properly. This can be an intermittent issue where the speedometer only works occasionally, the speedometer may cease all function, or the speedometer may read erratically or incorrectly. Also, the traction control and anti lock brake warning lights specific to each vehicle may be illuminated, depending on the design of those systems. You may notice the vehicle hesitate to accelerate, cruise control will not function properly, and the vehicle may not shift properly through all of the gears.

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.

A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.

Troubleshooting Cruise Control Issues in a Mercedes-Benz CLA35 AMG

When troubleshooting cruise control issues in your Mercedes-Benz CLA35 AMG, start with the simplest potential problems before moving on to more complex diagnostics. Begin by checking the cruise control switch and ensuring it is functioning correctly; a faulty switch can easily disrupt the system. Next, inspect the brake light switch, as a malfunction here can prevent the cruise control from engaging. If these components are in good condition, examine the ABS wheel speed sensors, as a defective sensor can cause the cruise control to fail. Additionally, assess the actuator under the hood for any signs of low resistance, which could indicate a deeper electrical issue. If the problem persists, consider the spiral cable in the steering wheel, as damage here can hinder communication between the control switch and the cruise control system. For a more thorough diagnosis, utilize a high-end diagnostic tool to pinpoint specific issues, and don't hesitate to seek advice from online forums like BenzWorld.org, where fellow Mercedes-Benz owners share their experiences and solutions. By following this structured approach, you can effectively identify and resolve cruise control issues in your vehicle.

What Could Cause Cruise Control Issues in a Mercedes-Benz CLA35 AMG?

When troubleshooting cruise control issues in your Mercedes-Benz CLA35 AMG, it's important to recognize the common problems that may be affecting the system's performance. A defective brake pedal switch is frequently the main issue, as it can prevent the cruise control from activating or cause it to disengage unexpectedly. Additionally, a faulty ABS wheel speed sensor can disrupt cruise control functionality and may also illuminate warning lights for the Electronic Stability Program (ESP) and Anti-lock Braking System (ABS). Another common culprit is a blown fuse, which safeguards the cruise control system; if this fuse is compromised, the entire system will stop working. Moreover, if you notice that the cruise control operates intermittently, this could indicate electronic or mechanical malfunctions within the system. To effectively diagnose these issues, conducting a comprehensive inspection of the cruise control components is essential. Utilizing a diagnostic scanner can assist in identifying fault codes, which will help pinpoint the specific problem, whether it involves a malfunctioning cruise control switch or the need for component replacement. By being aware of these common issues, you can take proactive steps toward troubleshooting and potentially resolving cruise control problems in your vehicle.

Why is the Cruise Control Not Working in a Mercedes-Benz CLA35 AMG?

When the cruise control in your Mercedes-Benz CLA35 AMG is not functioning, it is crucial to address the problem promptly, as neglecting it can lead to safety risks and potentially more significant vehicle issues. A defective brake pedal switch is a common culprit, as it can prevent the cruise control from engaging properly. Additionally, a blown fuse may disrupt the system's operation, while problems with the throttle control or ABS can also contribute to the malfunction. In older models, a broken vacuum line might be the source of the issue. Furthermore, a faulty ABS wheel speed sensor can not only disable the cruise control but may also trigger warning lights on your dashboard, indicating a need for immediate attention. Given the complexity of these systems, it is advisable to consult a qualified service technician who can accurately diagnose and resolve the underlying issue, ensuring your vehicle remains safe and reliable on the road.

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Mercedes-Benz CLA35 AMG Cruise Control Issues & Repairs