My 01 LS is throwing the listed code, which has to do with the Evap. Emission System. From my searching I've found that it may be the "fuel tank pressure sensor" is faulty since the code definition is "input voltage is higher than the maximum". I've fiddled with the gas cap as a possible cause, too. Does anyone know where this "fuel tank pressure sensor" is? I've read some cars have them under the hood and some have them on top of the gas tank.

 

The fuel tank pressure sensor is located on top of the fuel pump/fuel level sensor module. In the trunk there is a fuel pump access panel located under the carpet.Remove the carpet and the access panel and its easy to replace the sensor.Just unplug the 3 wire connector from the sensor and pull it out of the module.