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P0A78 - Drive Motor A Inverter Performance

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P0A78 - DRIVE MOTOR A INVERTER PERFORMANCE

Description:  This DTC indicates a traction motor high voltage inverter or a traction battery concern.
Possible Causes: 
  • Inverter concern
  • Inverter temperature sensor
  • Motor control module (MCM)
  • Motor gate drive circuit open
  • Motor current sensor
  • Motor current out of range
  • MCM supply voltage out of range
  • High voltage traction battery
Diagnostic Aids:  The TCM DTC P0A78 could be stored as a result of a traction battery concern. Check for the presence of traction battery control module (TBCM) DTC P0A1F, P0A27, or P0A8D.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST TS .
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