Many drivers find the automatic start-stop function annoying and prefer to disable it. While some vehicles offer a button to temporarily turn it off, the setting often resets each time the engine is restarted. This guide will walk you through how to use VCDS (Vag-Com Diagnostic System) to permanently disable start-stop, effectively creating a Vcds Start Stop Memory. We’ll explore the common challenges and provide potential solutions.
Common Issues Disabling Start Stop with VCDS
The original post highlights a common frustration: attempting to disable the start-stop system via VCDS, but having it remain active. The user tried adjusting the start-stop voltage limit in the gateway adaptations to 12.1V, but the system continued to shut off the engine. Modifying the start-stop temperature thresholds resulted in an “out of range” error. Even attempting an OCF (Online Coding Function) procedure for deactivation, which seemingly set the voltage limit to 12.1V and temperatures to 70°C, failed to produce the desired result. The vehicle’s auto-scan revealed a few fault codes in unrelated modules, but none that directly point to a start-stop malfunction. The persistent 12.4V gateway voltage, observed during the scan, suggests the system is operating above the modified 12.1V threshold, potentially explaining the continued start-stop activation.
Understanding VCDS and Start Stop System
VCDS allows access to a vehicle’s control modules, enabling modification of various settings. The start-stop system relies on parameters like battery voltage and temperature to determine when to activate. The goal is to modify these parameters outside the system’s operational range, effectively tricking it into staying inactive.
Potential Solutions for VCDS Start Stop Memory
While the original poster’s attempts were unsuccessful, there are several potential solutions to achieve VCDS start stop memory:
- Verify Correct Adaptation Channel: Double-check that the correct adaptation channel within the gateway module is being modified. Consult your vehicle’s specific documentation or online resources like the Ross-Tech wiki for the appropriate channel.
- Alternative Adaptation Values: Experiment with different voltage and temperature values outside the typical operating range. Incrementally increasing the voltage threshold (e.g., to 12.5V or higher) or significantly raising the temperature threshold might be necessary. However, proceed cautiously and consult reliable sources to avoid unintended consequences.
- Long Coding Modification: In some cases, modifying the long coding for the gateway module or a related module (e.g., engine control module) might offer a more permanent solution. This requires a deeper understanding of the coding structure and should only be attempted with proper guidance.
- Software Update: An outdated VCDS software version or vehicle firmware could contribute to compatibility issues. Ensure both are updated to the latest releases.
- Battery Condition: A weak or failing battery can prevent the start-stop system from disabling, even with modified parameters. Have the battery tested to ensure it’s in good working order.
Conclusion
Permanently disabling start-stop with VCDS start stop memory can be challenging due to variations between vehicle models and software versions. By carefully verifying adaptation channels, exploring alternative values, and considering factors like software updates and battery condition, you can increase your chances of success. Always consult reliable resources and proceed with caution when modifying vehicle settings with VCDS.
