NHTSA Complaint #11631410 — 2020 LAND ROVER RANGE ROVER

the brakes failed to function while I drove. I almost hit the car in front of me. the brake booster was not functioning. the engine check light appeared suddenly, but with that other messages too, and also that was safe to continue to drive with caution. Just to mention two more messages that appeared on the display were: Stability control not available and Hill descent Control not available. I had to press extremely hard to break the car and of course I had to drive very slowly. I was cough of guard and almost hit a car in front of me at the traffic light. afterwards I just drove very slowly to my house. I checked the errors on my car and did research (I did not go to the dealership because they just extort money from you). I found out that the auxiliary battery failed. I replaced the battery and reset the system and the new battery information and that fixed the issue. I read on the Land Rover forums similar experience from many owners of this car. I believe there is a serious design flow because the low voltage of the auxiliary battery should not have caused the brake booster to malfunction while I drove. Just to mention that this auxiliary battery is an additional battery, (it looks like a motorcycle battery) and the main one is still healthy. And this is a hybrid (PHEV) car. Lots of source of energy to power important modules in the car which should not depend on the small auxiliary battery. Plus, the engine was running, meaning the alternator should be enough to power the modules that failed. I was very scared and happy that it was not my wife who drove the car. I have a report that was generated by the diagnostic tool that I use. A lot of errors popped up during that scary drive home. I attached the report I recorded from my diagnostic tool.