So I pulled up the error code on my 92' Cutlass. I got error code 26 which is the Quad-Driver No. 1 error. The book says that the Quad-Driver module is in the PCM (Powertrain control module). Is the PCM the same as the ECM? I want to order a re- manufactured one off of ebay and its advertised as an ECM. I wanted to make sure. Thanks