The start-stop function, designed to save fuel, can sometimes be more of a nuisance than a benefit. Many drivers seek ways to permanently disable this feature. This article explores troubleshooting start-stop deactivation using VCDS (Vag-Com Diagnostic System), specifically focusing on the keyword “Deactivation Of Start-stop Function Vcds.”
Common Methods and Challenges
A common approach to deactivate the start-stop system involves adjusting the voltage limit in the gateway adaptations using VCDS. The user in the original forum post attempted to set the start-stop voltage limit to 12.1V in their vehicle’s gateway adaptations. However, this proved unsuccessful, as the start-stop system continued to engage.
Modifying temperature thresholds is another strategy. The original poster also attempted this method, but encountered an “out of range” error via VCDS. An Online Coding Function (OCF) procedure for start-stop deactivation through VCP (another diagnostic tool) was also attempted. Despite successfully setting the voltage limit to 12.1V and temperatures to 70°C, the start-stop system persisted.
The auto-scan provided reveals some potential clues. While most modules report “OK” status, malfunctions are indicated in modules 08 (Auto HVAC), 19 (CAN Gateway), and 5F (Information Electr.). The fault code in module 19 (CAN Gateway) – “0769 – Analog Measuring Input C1155 31 [009] – No Signal” – might be relevant to the start-stop issue, as it could relate to a voltage sensing problem. Numerous fault codes in Module 5F (Information Electr.) likely relate to data record issues and are probably unrelated to the start-stop system malfunction.
Potential Solutions and Further Diagnosis
Since the standard VCDS adjustments and the OCF procedure failed, further diagnosis is necessary. The forum post mentions a subsequent scan showing a gateway voltage of 12.4V, exceeding the modified 12.1V threshold. This suggests the voltage limit setting isn’t being recognized or applied correctly.
Possible solutions and diagnostic steps include:
- Verify Correct Coding Procedure: Double-check the specific VCDS coding procedure for the user’s vehicle model. Minor variations in procedures exist between different models and years.
- Check for Software Updates: Ensure both VCDS and the vehicle’s control modules have the latest software updates. Outdated software can sometimes cause unexpected behavior.
- Inspect Wiring and Connections: Physical issues with wiring or connections related to the start-stop system (e.g., battery sensor) might be contributing to the problem.
- Address Other Fault Codes: While seemingly unrelated, addressing the fault codes in modules 08 and 5F could potentially resolve underlying issues affecting the start-stop system.
- Consult Factory Repair Manuals: Refer to the official factory repair manuals for detailed troubleshooting guides and wiring diagrams specific to the vehicle.
- Expert Assistance: If the problem persists, seek help from an experienced automotive diagnostician or a Volkswagen/Audi specialist familiar with VCDS.
Conclusion
Deactivating the start-stop function using VCDS can be straightforward, but as this case demonstrates, challenges can arise. A systematic approach involving verifying procedures, checking for software updates, inspecting hardware, and addressing other fault codes is crucial. If simple solutions fail, consulting official documentation or seeking expert assistance is recommended. Successfully disabling the start-stop system often requires a thorough understanding of the vehicle’s specific configuration and potential underlying issues.
