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Home >> Cadillac >> 2000 >> DeVille Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.6L >> Diagnostic Tests >> DTC P0602: Pcm Not Programmed >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Flash PCM with correct software. Check if DTC resets. If DTC resets, go to next step.
  3. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to step  1.
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