Volkswagen EV Battery Preconditioning: The Fix Is Here
▼ Summary
– Early MEB-based Volkswagen Group EVs lack battery preconditioning despite having the necessary hardware, affecting models like the ID.3, ID.4, and Skoda Enyaq.
– Without preconditioning, fast charging in cold weather is slower because the battery restricts power when not at the ideal temperature.
– A solution involves a DIY circuit board created by Fredrik Gustafsson that taps into the car’s battery management system to enable preconditioning.
– The DIY method requires building and programming the board, connecting it via USB, and carries risks like voiding warranties and lacking monitoring features.
– An improved version with a smartphone app exists but isn’t widely available, making the initial DIY solution the current best option for affected owners.
For owners of certain Volkswagen Group electric vehicles, the absence of a battery preconditioning feature has been a significant inconvenience, especially during colder months. Models such as the Volkswagen ID.3, ID.4, and ID. Buzz, along with the Skoda Enyaq and Cupra Born, lack this capability despite having the required hardware installed. This omission leads to noticeably longer fast-charging times in cool weather, as the battery cannot reach its ideal operating temperature before charging begins.
The core issue affects MEB-platform EVs manufactured between 2021 and early 2024. These vehicles contain the physical components, a battery heater and coolant pump, to warm the high-voltage battery. However, the software needed to manually activate this preconditioning process was not included. Instead, the system only works automatically to prevent the battery from getting too cold, not to prepare it for rapid charging.
A practical solution has now emerged, developed by security engineer Fredrik Gustafsson. His innovative approach involves a small, programmable circuit board that interfaces with the car’s battery management system. Detailed instructions are available on his GitHub page, outlining a process that is manageable for those comfortable with basic technical projects.
To implement this fix, you first program the circuit board using a USB dongle. Once programmed, it connects to an extension cable that plugs into the BMS connector, typically located behind the glovebox. The required components are relatively affordable, costing around $40 to $50, not including the time needed for assembly.
One drawback of this initial design is its reliance on an external USB power source. A USB-C cable must be connected to provide power to the board, which then activates the battery heater and pump. This setup is functional but lacks integration and does not provide feedback on the battery’s temperature or the heater’s status.
It is crucial to understand that modifying your vehicle’s battery management system carries risks. Such alterations will likely void the manufacturer’s warranty, and we advise proceeding with caution. Gustafsson notes that the car’s built-in safety mechanisms should prevent any damage, as the heater is designed to shut off once the battery reaches the proper temperature.
For those seeking more information, the creator’s GitHub page and the VWIDTalk forum are valuable resources. There is also promising news about a second, more advanced version of the system already in development. This updated design incorporates a smartphone app for controlling the heater and monitoring system data. However, because the circuit board for this version is custom-made, a reliable distribution method has not yet been established.
For the time being, the original DIY method remains the most accessible option for drivers of these Volkswagen, Skoda, and Cupra EVs who need to precondition their batteries. While the solution isn’t seamless, it effectively addresses a key limitation for improved charging performance in cold conditions.
(Source: Inside EVs)