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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1256 (Instrument Panel, Gages, And Console) >> Diagnostic Information and Procedures >> DTC P1663: Pcm >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The PCM controls the change oil soon indicator when it determines that the engine oil life has decreased to a certain level. DTC P1663 will set when the PCM detects an improper voltage level on the control circuit of the change oil soon indicator.

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