What's the code p0301 Chevy TrailBlazer?

The Chevy TrailBlazer P0301 code indicates a mIS Fire in the engine. The specific definition states "MIS Fire Detected Cylinder 1". Besides the an illuminated Check Engine Light You may have other symptoms like poor fuel mileage, vibration a low RPM, and a rough drive. The mostly likely cause will be bad spark plugs, spark plug wires, or coil packs. Other causes that are less common include a bad fuel injector, vacuum leak, problem with the camshaft or crankshaft sensors, or low compression due to a damaged head gasket. To replace the spark plugs it will cost an estimated $95 to $115 for parts and $220 to $280 for labor. You will want to have the problem resolved as soon as possible. A delay can lead to a damaged and/or failed catalytic converter.