Leaderboard

The HVB fans turn on when the HVB is 8f degrees warmer than the internal cabin temperature thanks to the input from Raj in 2019.

I looked in the SM For normal HVB operating temperature and found the following. “With the ignition in the ON position and the engine running or OFF, the BECM monitors the High Voltage Battery internal temperature. There is also a High Voltage Battery inlet air temperature sensor mounted to the battery case which monitors temperature to the High Voltage Battery. The BECM uses the information from the various temperature sensors to control and maintain High Voltage Battery temperature by controlling the High Voltage Battery cooling fan. The ideal High Voltage Battery temperature is 25°C (77°F) with a desired range of 20°C (68°F) to 30°C (86°F).” The SM also mentions that if one gets a HVB over temperature PID set and the HVB temperature is above 95 F and fan speed is above 1500 rpm, the PID is most likely due to environmental conditions. I’m fairly certain that I read somewhere, the HVB will operate up to 45C (could be the trigger for the over temperature PID?). I believe the bottom line is: operate the HVB above the normal temperature range and expect a higher capacity fade rate.

1= yes because the electronic transmission requires such. No charge in the HVB, your vehicle will not start or run. 2. it is the HVB temperature you need to monitor, not the outdoor temperature. The HVB cells are like humans, when it gets much above 90F, they don't care for it and don't work as well. If you start to approach 100f, you are asking for trouble and the car may malfunction. Ask me about it as mine shut down 4x in Michigan during a hot, sunny day when I needed a bathroom break bad and there was no shady area to park in.. Damn HVB temperature rose significantly just sitting in the sun while I needed personal time. 3. Cord doesn't matter 4. If you are that serious about improved HVB capacity, you need to contact third party vendors. Your dealer will not do such.