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DTC P0A78: Drive Motor A Inverter Performance

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 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 malfunction.
Possible Causes: 
  • Inverter malfunction.
  • Inverter temperature sensor malfunction.
  • Motor control module (MCM) malfunction.
  • Motor gate drive circuit open.
  • Motor current sensor malfunction.
  • Motor current out of range.
  • MCM supply voltage out of range.
  • High voltage traction battery malfunction.
Diagnostic Aids:  The TCM DTC P0A78 could be stored as a result of a traction battery fault. Check for the presence of TBCM DTC P0A1F, P0A27, or P0A8D.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test TS .
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