What letter often marks the automatic selector position for low gear? L. The letter “L” commonly stands for Low and identifies a setting that restricts an automatic transmission to lower ratios.
Low is useful when a driver wants stronger engine braking on a steep descent or extra wheel torque while climbing, towing, or starting with a heavy load. Depending on the transmission, L may hold first gear only or may allow the transmission to select among a limited group of lower ratios. The exact behavior varies by vehicle design.
Older selector patterns often used numbers such as 3, 2, and 1. These numbers indicated the highest gear the transmission could use: selecting 2, for example, generally prevented an upshift beyond second gear. Many cars replaced the lowest numbered positions with L, making the control easier to recognize.
L is not the same as “lock” and does not always mean the car is permanently stuck in first gear. Modern transmissions may ignore a low setting temporarily if using it would overspeed the engine. Drivers should also avoid selecting low at excessive road speed unless the vehicle’s instructions permit it.