Mercedes-Benz GLA250 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz GLA250 and How to Fix Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
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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 GLA250 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 GLA250 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.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

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 GLA250

When troubleshooting cruise control issues in your Mercedes-Benz GLA250, begin by checking the most accessible components. Start with the control switch, ensuring it is functioning correctly and free from damage. Next, inspect the vehicle's fuses related to the cruise control system, as a blown fuse can easily disrupt functionality. If these initial checks do not resolve the issue, move on to examining the throttle actuation system, as problems here can prevent cruise control from engaging. Additionally, assess the ABS sensors, since a failure in any wheel speed sensor can disable the cruise control along with other critical systems. If the problem persists, consider testing the actuator for resistance; low resistance can indicate potential damage to the controller. Finally, if all else fails, investigate any underlying engine or transmission issues, as these can also lead to cruise control deactivation. By following this structured approach, you can effectively identify and address the root cause of cruise control malfunctions in your vehicle.

What to Check When the Cruise Control Isn't Working in a Mercedes-Benz GLA250?

When your Mercedes-Benz GLA250's cruise control isn't functioning, it's crucial to investigate several common issues that could be at play. Start by examining the control module, as a failure here can prevent the system from operating correctly. Additionally, check the sensors and switches associated with the cruise control; any malfunction in these components can disrupt functionality. Throttle actuation problems are another potential culprit, so ensure that the throttle is responding as it should. Don't overlook the ABS sensors, as failures in these components can disable the cruise control system along with other critical safety features. Lastly, a malfunctioning speed sensor can lead to erratic behavior, such as the cruise control shutting off unexpectedly. Monitoring your speedometer while driving can help identify this issue. By systematically checking these areas, you can effectively diagnose and potentially resolve the cruise control problem in your GLA250.

Why is the Cruise Control Not Working in a Mercedes-Benz GLA250?

When the cruise control in your Mercedes-Benz GLA250 is not functioning, it is crucial to address the issue promptly, as neglecting it can lead to safety risks and further complications. A defective ABS sensor is a common culprit; if any of the ABS wheel speed sensors fail, it can disable not only the cruise control but also essential systems like ABS and stability control, which are vital for safe driving. Additionally, a faulty brake pedal switch can prevent the cruise control from engaging properly, posing a risk during long drives. Other potential issues include problems with the throttle control system or even a broken vacuum line in older models, which can disrupt the cruise control functionality. It is also important to ensure that the cruise control is correctly selected; if the LIM indicator lamp is illuminated, it indicates that the Variable Speedtronic is active, and cruise control will not engage. By diagnosing these issues early, you can maintain the safety and performance of your vehicle, preventing more significant problems down the line.

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