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Home >> Toyota >> 2012 >> Prius Three >> Repair and Diagnosis (Single Page) >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (Except Plug-In)) (Diagnostic Codes (P0069-273 - P0A78-113)) >> Hybrid Control System >> DTC P085D-582: Gear Shift Control Module "A" Performance; DTC P085D-599: Gear Shift Control Module "A" Performance; DTC P0861-597: Gear Shift Control Module "A" Communication Circuit Low; DTC P0862-598: Gear Shift Control Module "A" Communication Circuit High >> Description
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DTC P085D-582: Gear Shift Control Module "A" Performance; DTC P085D-599: Gear Shift Control Module "A" Performance; DTC P0861-597: Gear Shift Control Module "A" Communication Circuit Low; DTC P0862-598: Gear Shift Control Module "A" Communication Circuit High: Description

When a signal is input from the transmission shift main switch (P position switch) or selector lever, the power management control ECU (HV CPU) transmits a P position control (PCON) signal to the transmission control ECU assembly. Based on this signal, the transmission control ECU assembly actuates the shift control actuator assembly in order to mechanically lock or unlock the counter drive gear in the hybrid vehicle transaxle assembly.

P position state (engaged or released) of the actuator assembly is sent to the power management control ECU (HV CPU) as a P position (PPOS) signal.

Fig 1: Identifying Hybrid Vehicle Transaxle Assembly
GTY213087Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DTC No. INF Code DTC Detection Condition Trouble Area
P085D 582 P position (PPOS) signal is logically inconsistent
  • Wire harness or connector
  • Transmission control ECU assembly
  • Power management control ECU
599 P position (PPOS) signal malfunction (output pulse is abnormal)
P0861 597 GND short in P position (PPOS) signal circuit
P0862 598 +B short in P position (PPOS) signal circuit