Accessing vehicle data through the OBDII port is crucial for diagnostics and monitoring. However, some vehicles, like the Hyundai Ioniq, limit data access when the car is off. This article explores accessing Ioniq’s Battery Management System (BMS) data using specific Obdii Car Off Pids (Parameter IDs).
While a standard OBDII scanner might not retrieve data with the ignition off, targeted queries can unlock valuable insights. The Ioniq’s CAN bus operates on a query-response basis, meaning it remains relatively silent until a specific request is sent. Therefore, simply sniffing the bus won’t yield results.
Accessing BMS data requires sending specific OBDII requests. Successful data retrieval has been achieved using commands like 7E4#022101, 7E4#022102, 7E4#022103, 7E4#022104, and 7E4#022105. These commands, formatted for tools like AutoPi, target specific PIDs within the BMS. Further research is needed to fully understand the structure of these commands, specifically the “02” preceding the PID.
A comprehensive resource for understanding Hyundai Ioniq PIDs is available on GitHub: https://github.com/JejuSoul/OBD-PIDs-for-HKMC-EVs/tree/master/Ioniq%20EV. This repository provides a list of known PIDs, their corresponding meanings, and instructions for converting the hexadecimal (HEX) data into usable information. It offers a valuable starting point for anyone looking to decode Ioniq’s data.
It’s crucial to note that the Ioniq’s various controllers, including the BMS, generally remain unresponsive when the ignition is off. This behavior contrasts with some other vehicles where continuous data broadcasting persists even without power. This characteristic necessitates the use of specific query commands to retrieve data from a powered-off Ioniq.
Understanding and utilizing these specific OBDII car off PIDs opens up possibilities for advanced diagnostics and monitoring of the Hyundai Ioniq’s BMS, even when the car is not running. While challenges exist due to the car’s quiet CAN bus, targeted queries offer a pathway to access valuable data. Further investigation and experimentation with these commands and the referenced GitHub resource are encouraged for those seeking deeper insights into the Ioniq’s systems.
