Bringing back an old thread to life here - but wanted to thank the community for this info! I read it a long time ago and then forgot about it. Recently, my garage started smelling like natural gas, so bad in fact we called our local utilities company and they came right out. I know there isn't any natural gas lines or appliances in or near my garage but the smell was so strong I was worried there was a major leak "somewhere," and my house would explode! The technician came out and no leaks. Then about 5 frickin days later my "dumby light," (in my case) came on.......holy sh*t, it's my frickin PTU!!!
Makes even more sense bc I've been having some shifting issues also. Long story, short - car went to dealer and I'm getting a brand new PTU and they're doing some work on the tranny also! Lastly, thank goodness I bought the extended warranty also!