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Diagnose/P0631
P0631Medium SeverityElectrical

TCM Internal Communication Error

What This Means

The tcm internal communication error has been detected. This relates to the PCM internal programming or actuator control.

Common Symptoms

  • Check engine light on
  • Charging system warning
  • System malfunction
  • Reduced functionality

Common Causes

  • PCM programming error
  • Module failure
  • Wiring issue
  • Communication error
  • Internal component failure

Estimated Repair Cost

$100 – $1500
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.