NHTSA Complaint #11518325 — 2019 CHEVROLET BOLT EV

After driving the car for roughly 60-75 minutes while at highway speeds and within the posted speed limits: 65mph-75mph, the car will chime and the driver information panel will flash "Propulsion Reduced." At that point, the vehicle's electrical propulsion will gradually reduce to a maximum output power of roughly 20KW. The propulsion will stay capped at 20KW for a bit of time (15-20 minutes) and then gradually the cap will increase. Unfortunately, on I-25 in southern Colorado where this usually occurs, the speed limit is 75mph and and 20KW of propulsion results in the vehicle traveling on the interstate at roughly 45-55mph which results in very unsafe situations. That road has a minimum speed of 55mph. This happened on the first day that I purchased the car, I can reproduce it with my family in the car, but the dealer has been unable to reproduce it. I have had the Chevrolet dealership inspect it multiple times, but they can not find a fault. It has happened when ambient temperatures are as low as 28F and as high as 98F there does not appear to be a correlation there. I have had it happen when the battery has a SOC of 70% and as low as 25%, that also does not show a correlation. I have seen a correlation with passengers/weight in the vehicle as that requires more KW of output to propel the car. Likewise, consistent average speed has a correlation. If traveling at 75mph (posted speed limit) the propulsion reduction will occur sooner rather than traveling at 73mph.