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DTC P1618 - SPI Pcm INTERPROCESSOR Communication Error

WARNING: This page is about a different car, the 1996 Acura SLX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) System Check. See BASIC TESTING 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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