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Home >> GMC >> 1987 >> Forward Control 7.4 W, Standard >> Repair and Diagnosis >> Engine Performance >> System >> CCC TBI Tests W/Codes >> Diagnostic Charts >> Code 51 - Prom Problem (2.8/4.3/5.0/5.7/7.4L)

Code 51 - Prom Problem (2.8/4.3/5.0/5.7/7.4L)

Check that all pins are fully inserted in socket. If okay, replace PROM, clear memory and recheck. If Code 51 appears, replace ECM.

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