I have a 2005 Toyota Prius that has had the red triangle warning light come on occasionally over the past few weeks along with a message about the park mode not being applied correctly and that the car needs to be parked on a flat surface (it was) and the parking brake fully applied. Sometimes turning the car off and on will remove the light. Other times I cannot get the light and warning message to turn off and the car will not turn on. Last nightI had to turn the car on and off 6-8 times before I could drive it (even though the red triangle warning stayed on the entireXXXXXhome). This morning I turned the car on as normal and there was no warning light or message and the car functions normallty. I have checked the brake fluid and it's good and there is no change in the way the car drives. Any ideas on what this red triangle light is? Thank you.