One problem related to underhood wiring has been reported for the 2007 Jeep Wrangler. The most recently reported issues are listed below.
I started my car and attempted to pull out of the driveway when the engine light turned on and the car began to shake. I stopped the car, kept the engine on and let it sit for a 5 minutes and warm up. I put it in drive again and made it 1 block when the engine light started blinking, the engine began to sputter, and smoke was seen coming out of the muffler and hood of my Jeep. I opened the hood only to be consumed with the smell a gas. When the tow truck driver arrived, he explained that I was very lucky as the car engine would have caught on fire if I would have continued to drive one more block. The dealership initially thought it was the fuel igniter, as it was found stuck open. They ended up replacing the wiring for the electrical system that controlled the igniter instead. So far it's running fine.