P0603 DTC

P0603

Technical Definition:

(Internal Control Module) Keep Alive Memory (KAM) Error

Trouble Code: P0603
Address: 0x0603
System: Powertrain
Subsystem: Computer and Auxiliary Output Circuits
Technical Description:

Possible Causes:
  • Battery terminal corrosion or loose connections
  • Keep Alive Power (KAPWR) circuit wire routing
  • Open wire in the KAPWR circuit
  • Damaged PCM, water intrusion / internal fault
  • Charging system fault
  • Ignition system fault causing secondary ignition voltage inference
  • Internal PCM program fault

Possible Symptoms:

Internal Control Module Keep Alive Memory Error

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Loose or poor battery terminal connection
– Low battery charge
– ECM power supply circuit is open or shorted
– ECM Programing
– Faulty ECM

Specific Makes:

– Engine may not start