Are you an owner of a 2019 e-Golf and curious about your battery’s health? Like many EV enthusiasts, you might be exploring the data accessible through OBD2 ports and tools like OBD11 or VCDS. Initial investigations suggest that these tools can provide valuable insights into battery degradation beyond the standard driver information. Let’s delve into some early findings and see what the community can uncover about the 2019 e-Golf battery using OBD2 data.
One user on an online forum started digging into Module 19 data using OBD11, focusing on figures labeled SOH_Q and SOH_P. Speculation arose that these values might be linked to battery degradation. To test this theory, they performed calculations based on the data extracted from their 2019 e-Golf and compared it to data from an older 2016 model.
The calculations centered around “Energy storage unit SOC” (State of Charge) figures, measured in Wh. By comparing this with the “HV battery Charge State” (the user-facing SOC percentage), they estimated the usable battery capacity. For their 2019 e-Golf with approximately 2,852 miles, they recorded:
- Energy storage unit SOC: 15475 Wh
- HV battery Charge State: 49.0%
- SOH_Q: 97%
- SOH_P: 97%
Based on these figures, the calculated usable capacity today was approximately 31581 Wh (15475/49*100). Extrapolating further, they estimated the factory usable capacity to be around 32558 Wh (31581/97*100). This suggests a potential initial usable capacity that is less than the total battery capacity, possibly around 90% of what’s advertised, even when “fully charged” according to the car’s gauge.
Comparing this to a 2016 e-Golf with higher mileage (26,154 miles) revealed:
- Energy storage unit SOC: 15000 Wh
- HV battery Charge State: 80.0%
- SOH_Q: 87%
- SOH_P: 87%
The calculated usable capacity for this older e-Golf was significantly lower at 18750 Wh, with an estimated factory usable capacity of 21551 Wh. The noticeable drop in SOH_Q and SOH_P in the 2016 model seems to correlate with the reduced usable capacity, supporting the theory that these OBD2 figures can indeed indicate battery degradation.
The “HV battery charge state” figure aligns with what’s displayed in apps like Car-Net, confirming it as the user-facing SOC rather than the absolute cell SOC. Monitoring the “Energy storage unit SOC” also showed real-time changes, with a decrease of 300Wh observed while the car was running, further validating the accuracy of these OBD2 readings.
To further validate these initial findings and build a more comprehensive understanding of 2019 e-Golf battery health and OBD2 diagnostics, we need more data. If you own an OBD11 or VCDS tool and a 2019 e-Golf (or similar model year), please consider sharing your figures. Contributing your “Energy storage unit SOC,” “HV battery Charge State,” “SOH_Q,” and “SOH_P” values, along with your vehicle’s mileage and build date, could be invaluable. By pooling our data, we can collectively determine if OBD2 can be a reliable way to diagnose e-Golf battery health, moving beyond relying solely on the trip computer and manufacturer data. Your contribution can help the e-Golf community unlock a deeper understanding of EV battery longevity and health.
