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DTC P1640: Powertrain DTCS Available In Another Module

P1640 - POWERTRAIN DTCS AVAILABLE IN ANOTHER MODULE

Description:  Vehicles using a secondary engine control module can request that the powertrain control module (PCM) illuminates the malfunction indicator lamp (MIL) when a failure occurs which affects emissions.
Possible Causes: 
  • DTCs stored in a secondary module, which requested the MIL to be turned on
Diagnostic Aids  :
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
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