Mercedes-Benz AMG GT S Cruise Control Isn't Working

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

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Reviewed by
Devin Cabugcal
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 AMG GT S 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 AMG GT S 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 AMG GT S

When troubleshooting cruise control issues in a Mercedes-Benz AMG GT S, it's essential to adopt a systematic diagnostic approach. Start by checking the simplest components, such as the brake pedal switch and fuses, as these are often the culprits behind cruise control malfunctions. If the cruise control system displays an inoperative warning message, this indicates a more significant issue that may involve the control module or sensors. Next, inspect the throttle actuation system, as problems here can disrupt cruise control functionality. If you experience intermittent operation, consider potential electronic or mechanical failures within the system. Additionally, ensure that the brake light switch is functioning correctly, especially if warning lights like ETS and ABS are illuminated. By methodically addressing these areas, you can effectively diagnose and potentially resolve the cruise control issues in your AMG GT S before seeking professional assistance.

What Could Cause Cruise Control Malfunctions in a Mercedes-Benz AMG GT S?

When dealing with cruise control malfunctions in your Mercedes-Benz AMG GT S, it's essential to understand the various common problems that could be at play. One of the primary culprits is a failed control module, which can disrupt the entire cruise control system. Additionally, issues with sensors, such as a faulty throttle position sensor, can lead to erratic engine behavior, including excessive fuel consumption and black exhaust. It's also crucial to check the brake pedal sensor, as its proper functioning is vital for cruise control engagement; a defective switch here can prevent the system from activating. Furthermore, blown fuses can interrupt the power supply necessary for cruise control operation, while throttle actuation problems and ABS wheel speed sensor failures can also contribute to the issue. By systematically diagnosing these components, you can effectively identify the root cause of the malfunction and take the necessary steps to resolve it, ensuring a smoother driving experience. If the problem persists despite your efforts, consulting a professional service team may be the best course of action.

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

When the cruise control in your Mercedes-Benz AMG GT S is not functioning, it is crucial to address the issue without delay. Ignoring symptoms such as a defective brake pedal switch or issues with the throttle control system can not only compromise your driving experience but also pose significant safety risks. For instance, a malfunctioning brake light switch can prevent the cruise control from engaging, potentially leading to unexpected acceleration or difficulty in maintaining speed. Additionally, if the problem stems from an ESP error, it may disable the cruise control altogether, leaving you without this essential feature during long drives. Furthermore, issues like a blown fuse or a broken vacuum line can escalate into more severe problems if left unchecked, potentially leading to costly repairs. Therefore, diagnosing and resolving the underlying cause of the cruise control malfunction is vital to ensure both your safety and the optimal performance of your vehicle.

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Mercedes-Benz AMG GT S Cruise Control Issues & Repairs