P0603 – Internal Control Module Keep Alive Memory Error

Description

The ECM detects a fault in the keep-alive memory circuit.

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Symptoms

  • Rough idle
  • Poor fuel economy
  • Hard starting

Causes

  • Battery disconnect
  • ECM memory failure
  • Wiring issues

Diagnosis

  • Check battery voltage
  • Inspect ECM grounds
  • Scan for faults

Repair

  • Repair wiring
  • Replace ECM
  • Fix power/ground issues

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