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What does O/D off mean?

How the O/D Off Button Controls Your Transmission That small button on or near your gear shifter, usually labeled O/D OFF, is ...
Motor Trend

NHTSA to Investigate GM Vehicles for Faulty Gear Shifters

The National Highway Traffic Safety Administration (NHTSA) on Monday opened an investigation for certain General Motors vehicles that may have a faulty automatic transmission gear shift indicator.