CHECK THAT ALL PIN ARE FULLY INSERTED IN THE SOCKET. IF OK, REPLACE MEM-CAL, CLEAR MEMORY AND RECHECK. IF CODE 51 REAPPEARS, REPLACE ECM
NOTICE: To prevent possible eletrostatic discharge damage to the ECM or MEM-CAL, do not touch the component leads. Do not remove intergrated circuit from carrier.
SOURCE: GM SERVICE MANUAL.
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