DTC P1640: Output Driver Module Circuit No. 1: Description

Output Driver Modules (ODM) are chips inside Powertrain Control Module (PCM). ODMs provide grounded outputs that control devices. Each output has an internal feedback circuit that connects to PCM microprocessor. ODM 1 determines if voltage or current may cause damage to PCM. PCM monitors voltage through ignition 1 input. Any incorrect current that is on a circuit to ODM will cause ODM to report this DTC.