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Home >> GMC >> 1989 >> Magnavan 7.4 N, 475/M40 >> Repair and Diagnosis >> Engine Performance >> System >> 6.2L CEC Testing >> Diagnosis & Testing >> Code 51 - Prom Problem

Code 51 - Prom Problem

Check that all pins are fully inserted in socket. If okay, replace PROM and recheck. If problem is not corrected, replace ECM.

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