What does it mean?
Almost all of the latest makes and models with automatic transmissions use the PCM (Powertrain control module) and the TCM (Transmission control module) to control most of the shifting, pressures and other systems involved with an automatic transmission. The TCM is a computer which controls, monitors and adjusts various electrical components and systems specifically within the transmission system. The power relay control circuit is a circuit within the transmission electrical system. The electrical value(s) of the power relay control circuit must go beyond the functional parameters in order for the TCM to recognize a problem and then proceeds to turn on the check engine light in the instrument cluster with code P0886.