Had the CEL go on, on my 2004 Jeep V8 Grand Cherokee. To get the code on a jeep, (maybe all cars?) all you need to do is cycle the ignition on and off 3 times. After the 3rd time the code will pop up in place of the odometer. E0308 was what came up. I looked up the code online and it was misfire on #8cylinder.
I called the Jeep Dealer (Mariano in Concord) where I bought the Jeep (used) and they had me bring it in. Turned out to be a blown head gasket. Because I had bought the extended warranty, the cost of repair to me was the $100 deductible. They even covered a Hertz rental for 5 days while they tore down the engine and rebuilt the head.
Sometimes the extended warranty is a GREAT Deal.
