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Diagnose/P0601
P0601High SeverityElectrical

Internal Control Module Memory Check Sum Error

What This Means

The engine control module (ECM/PCM) has detected an internal fault: internal control module memory check sum error. This is a serious internal computer issue that may require PCM replacement or reprogramming.

Common Symptoms

  • Multiple warning lights
  • Engine may not start
  • Erratic behavior
  • Communication errors during diagnostics

Common Causes

  • PCM internal failure
  • Power supply issue to PCM
  • Corroded PCM connector
  • Voltage spike damage
  • Water intrusion

Estimated Repair Cost

$200 – $2000
Parts and labor (varies by vehicle and location)
Difficulty:Professional

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.