shadyTreeMech posted a topic in Cadillac Deville, Eldorado, Seville, Fleetwood, Sixty SpecialExperiencing loss of power when driving on highway and ses light came on. ses is flashing. I figured it was probably a coil pack but, their expensive. I am getting multiple error codes. PCM p0300 - the unhelpful misfire code MSM b1850- driver lumbar? IPC u1000 - module not communicating? ABS c1246 brake lining sensor open circuit PCM p0442 - evaporative emission control system leak Any advice would be appreciated.