Your over exposing. Post the EXIF information from the photograph, that will help a lot. I'm sure your histogram is heavy on the right. Cars as a rule are difficult to shoot due to the reflection. Dark colors red included can cause the camera meter to over/under expose. Not sure if your camera will let you, set the exposure on something neutral in the same light as your subject. As an example, set the exposure on the grass or trees around your truck. The camera metered off the dark truck and blew everything else out. Meter off something neutral in the same light and you give the camera a chance to keep everything within reason exposed properly.
The reason the the top picture looks so good, overcast day, no shadows, grey car with grey background, the camera meter will have a orgasm with those conditions.
Stop by the book store and flip through "Understanding Exposure" by Bryan Peterson. If you like what you see and it looks helpful pick it up.