DTC P0700: Transmission Control System (Mil Request): Description

This Diagnostic Trouble Code (DTC) indicates that an emissions related transmission fault has occurred. The Transmission Control Module (TCM) has no direct control of the Malfunction Indicator Lamp (MIL), but if a transmission fault occurs that is emissions related, the MIL must illuminate. The TCM transmits a MIL request signal over the CAN bus to the ECM and the ECM will turn ON the MIL. This allows the MIL to illuminate, even though the fault was detected by the TCM. If a TCM MIL request signal is received by the ECM, P0700 will set.