I have an error code P1640 Quad Driver Module 1 and a P1670 Quad Driver Module. They started late summer after the AC Cluch seized up. So far I have replaced the EGR Valve (cleaned the bypass pipe) and the Transmission shift solenoids. I was told it could be the fuel pump because of the pressure on fuel rail is reading 40 PSI. Could it be the fuel pump? If not what could it be? PLEASE HELP!
Sunday, January 6th, 2013 AT 6:06 AM