P0605 – Internal Control Module ROM Error

Description

The ECM detects an internal ROM memory error.

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Symptoms

  • No start
  • Stalling
  • Check engine light

Causes

  • ECM internal failure
  • Corrupted ROM
  • Voltage issues

Diagnosis

  • Scan for ECM faults
  • Check battery/alternator
  • Inspect grounds

Repair

  • Replace ECM
  • Repair power/ground issues