Code 16 - lift down valve - short circuit, Code 17 - ground control module - in fold back, Code 18 - alarm - short circuit – JLG 15/20MSP Service Manual User Manual
Page 145: Code 16 - lift down valve - short circuit -25, Code 17 - ground control module - in fold back -25, Code 18 - alarm - short circuit -25, See table 6-20, Ge 6-25, See table 6-21, See table 6-22

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