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Diagnose/U0115
U0115High SeverityElectrical

Lost Communication with ECM/PCM B

What This Means

The vehicle's CAN bus network has lost communication with the ECM/PCM B. This means other modules cannot exchange data with this module, which may disable related systems.

Common Symptoms

  • ECM/PCM B functions disabled
  • Warning lights on
  • Communication fault during diagnostics
  • Related systems inoperative

Common Causes

  • Failed ECM/PCM B
  • CAN bus wiring damage
  • Corroded network connector
  • Power/ground issue to module
  • Water intrusion

Estimated Repair Cost

$150 – $1000
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.