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Home >> Buick >> 2002 >> Century Custom >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.1L Engine >> Diagnostic Tests >> DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681 Or P1683: Control Module Read Only Memory >> Test Description

Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 2

    A DTC P0602 indicates the PCM is not programmed.

  2. 4

    Attempt to program the PCM. If the PCM fails to program a second time, replace the PCM.
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