55 A/D Error

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The PCM receives analog voltage signals from various sensors and converts them to digital square waves. If there is a problem with the conversion process, Code 55 will set.

Code Parameters

  • Code 55 will set if:
  • The analog to digital conversion takes too long.
  • The low voltage of a square wave is greater than 0.1 volt.
  • The high voltage of a square wave is less than 4.88 volts.

Diagnostic Aids

  • Code 55 indicates an internal PCM malfunction. The PCM should be replaced.