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P0A1A - Generator Control Module

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.
P0A1A - GENERATOR CONTROL MODULE

Description:  This DTC indicates a generator control module (GCM) internal concern.
Possible Causes: 
  • GCM processor concern
  • GCM A/D converter concern
  • GCM supply voltage out of range
  • TCM-GCM serial link concern
Diagnostic Aids:   
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   See Note 2 - See Note 5