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Home >> GMC >> 1999 >> Forward Control 7.4 J >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P1537-U1193 >> DTC P1621 >> DTC P1621: Pcm Memory Error (1.9L SATURN) >> Diagnostic Procedures

Diagnostic Procedures

Reprogram PCM. If DTC P1621 resets, replace PCM. Program replacement PCM using required equipment.

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