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Home >> GMC >> 1987 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> CCC Theory/Operation >> Operation >> Electronic Control Module (ECM) Operation >> CALPAK (Calibration Package)

CALPAK (Calibration Package)

The CALPAK contains back-up fuel control circuitry required to keep the vehicle operable enough to get it to a repair facility in the event the ECM becomes damaged or defective. If battery voltage is removed, CALPAK information will be retained. The CALPAK can be removed from the ECM. If the CALPAK is missing from the ECM, a no start and run condition will be exhibited. A missing CALPAK can also set a Code 52.

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