Mercedes-Benz S560 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your Mercedes-Benz S560 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
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 S560 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 S560 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 S560

When troubleshooting cruise control issues in your Mercedes-Benz S560, it's crucial to adopt a systematic diagnostic approach. Begin by inspecting the simplest components, such as the cruise control fuse, which can often be the culprit if blown. Next, check the brake pedal switch, as a malfunction here can disrupt the cruise control system by failing to signal when the brakes are applied. If these initial checks do not resolve the issue, turn your attention to the speed sensor connections, ensuring that there are no loose wires or faults that could be affecting the system's performance. Additionally, consider the condition of the ABS wheel speed sensor, as a failure in this component can lead to broader system malfunctions, including the cruise control. If these steps do not yield results, it may be necessary to delve deeper into the control module and throttle system, as these are interconnected with the cruise control functionality. While DIY troubleshooting can be effective, remember that some issues may require professional expertise, especially if specialized diagnostic tools are needed. By following this structured approach, you can efficiently identify and address the root causes of cruise control problems in your S560.

What Could Cause the Cruise Control to Malfunction in a Mercedes-Benz S560?

When addressing cruise control malfunctions in a Mercedes-Benz S560, it's essential to identify the common problems that may be at play. A defective brake pedal switch is often a primary suspect, as it can prevent the cruise control from engaging correctly. Additionally, a dead battery can disrupt the vehicle's electrical systems, leading to similar issues. The ABS wheel speed sensor is another vital component; if it malfunctions, it may trigger warning lights and disable the cruise control functionality. Checking for blown fuses is also advisable, as these can interrupt the power supply to the cruise control system. Other potential culprits include throttle body malfunctions, which can affect overall engine performance, and issues with the PRNDL or shifter position switch, which can miscommunicate the vehicle's operational status. Furthermore, a faulty brake light or brake switch can signal to the system that the brakes are engaged, thereby disabling cruise control. If the check engine light is on, it may indicate underlying engine problems that could also impact cruise control operation. By systematically diagnosing these areas, you can effectively pinpoint and resolve the cruise control issues in your Mercedes-Benz S560.

Why is the Cruise Control Not Working in a Mercedes-Benz S560?

When the cruise control in your Mercedes-Benz S560 is not functioning, it is crucial to address the issue promptly to avoid potential safety hazards and costly repairs. A malfunctioning cruise control system can stem from various factors, such as a defective brake pedal switch or a dead battery, which may not only hinder your driving experience but also compromise your vehicle's overall safety. If the ABS wheel speed sensor fails, it can trigger warning lights that indicate deeper issues within the system, potentially leading to erratic vehicle behavior. Additionally, if the cruise control switch fails to engage due to brake pedal issues, you may find yourself unable to maintain a steady speed, increasing the risk of accidents. Ignoring error messages like "cruise control inoperative" can exacerbate the problem, leading to more significant damage and repair costs. Therefore, it is essential to diagnose and resolve these issues as soon as they arise, ensuring your vehicle remains safe and reliable on the road. If you encounter any problems, seeking professional assistance is highly recommended to ensure a thorough and accurate diagnosis.

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