P0604 – Internal Control Module RAM Error

Description

The ECM detects an internal RAM memory error.

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Symptoms

  • No start
  • Stalling
  • Multiple warning lights

Causes

  • ECM internal failure
  • Voltage spikes
  • Poor grounds

Diagnosis

  • Scan for ECM faults
  • Check charging system
  • Inspect grounds

Repair

  • Replace ECM
  • Repair power/ground issues