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Hi, My better half wants to know what the D with a slash through it, surrounded by a square means. He thinks it has to do with overdrive, but wants to know for sure. GMC C5500 Kodiac Endurance 2005
According to the manual for my '05 2500HD, it indicates that you have disabled the overdrive option of the transmission. If you press and hold the button on the end of the gearshift lever, you can turn the option back on and the symbol will go away.