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Home >> Isuzu >> 1999 >> Trooper Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Trouble Code Identification >> DTC P1618: Serial Peripheral Interface (SPI) Pcm INTERPROCESSOR Communication Error
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DTC P1618: Serial Peripheral Interface (SPI) Pcm INTERPROCESSOR Communication Error

  1. Perform On-Board Diagnostic (OBD) System Check. See BASIC DIAGNOSTIC PROCEDURES article. After performing OBD system check, go to next step.
  2. If EEPROM calibration is latest version available, replace PCM. Retest system. If EEPROM calibration is not latest version, go to next step.
  3. Reprogram PCM with latest available EEPROM calibration. Clear DTCs. If DTC P1618 resets, replace PCM. If DTC P1618 does not reset, repair is complete.
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