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P0604 – Internal Control Module RAM Error

Want to confirm the real cause of this fault code?

A high‑quality OBD2 scanner gives you live data, fuel trims, sensor readings and freeze‑frame information — exactly what you need to verify the root cause of this code with confidence.

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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
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