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Home >> Ford >> 2004 >> Focus LX, 2.3 Z, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Powertrain DTC Charts & Descriptions - CNG, Flex-Fuel & Gasoline >> Diagnostic Trouble Code (DTC) Charts >> P0603 - Powertrain Control Module Keep Alive Memory (KAM) Error
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P0603 - Powertrain Control Module Keep Alive Memory (KAM) Error

P0603 - POWERTRAIN CONTROL MODULE KEEP ALIVE MEMORY (KAM) ERROR

Description:  Indicates the PCM has experienced an internal memory fault. However, there are external items that can cause this DTC.
Possible Causes: 
  • Reprogramming.
  • Battery terminal corrosion.
  • KAPWR to PCM interrupt/open.
  • Loose battery connection.
  • Damaged PCM.
Diagnostic Aids:  If KAPWR is interrupted to the PCM because of a battery or PCM disconnect, a DTC can be generated on the first power-up.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to QB: DTCs P0603 or P1633: Keep Alive Power STEP 1 - -