DTC P084C: Short in Line Pressure Switch Circuit, or Line Pressure Switch Stuck ON: General Description

The line pressure switch is installed in the hydraulic pressure output circuit from line pressure solenoid valve A. When line pressure solenoid valve A outputs hydraulic pressure, the line pressure is regulated to low line pressure and the switch is turned on. When line pressure solenoid valve A does not output hydraulic pressure, the line pressure is at normal line pressure and the switch is turned off. The signal from the line pressure switch is input to the powertrain control module (PCM). The PCM detects the hydraulic pressure supply condition from line pressure solenoid valve A to detects a malfunction in line pressure solenoid valve A. If the line pressure switch is on against the command to turn off line pressure solenoid valve A, the PCM detects a line pressure switch stuck on failure and stores a DTC.