What does it mean?
If your OBD-II equipped vehicle has stored a code P0880, it means that the PCM has detected a malfunction in the power (voltage) input signal circuit for the transmission control module (TCM). In most cases, the TCM is integrated into a single housing with the PCM. Nevertheless, the section of the module which controls (automatic) transmission function may be powered up separately.
In any case, the TCM is typically powered using switched (only present with the ignition switch in the ON, start, or run position) voltage. This circuit is normally equipped with a fuse, fusible link, and/or a relay. Frequently, the PCM and TCM are powered using the same relay albeit by separate circuits. Access to a reliable vehicle information source will yield necessary details of the TCM power circuit for the specific vehicle in question.
Each time the engine is started, the PCM performs a self-test of all controllers. If no acceptable TCM power input signal (battery voltage) is discovered, a code P0880 will be stored and a malfunction indicator lamp may be illuminated, In some models, the transmission controller will also enter limp-in mode if a code of this type is stored.