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There are several causes that an automatic transmission will not want to shift into second gear. The two most common causes are transmission pump issues and trouble with the vacuum modulator.
A bad transmission gear can cause your 1999 Nissan frontier to shift hard. Low transmission fluid can also cause the transmission to shift hard.
A seized up transmission can cause a Volkswagen Golf with an automatic transmission to not shift and racing RMPs after second. A worn gear can also prevent shifting.
An automatic transmission can lock in a Honda for several reasons. The most common problem is with the shift solenoids. These parts allow the transmission to shift and when one is malfunctioning the gearbox may not go into gear.
If your gear shift is freezing it could be because your clutch is not longer working. If you have an automatic then your transmission may be slipping.
The transmissions aren't made by Freightliner, and this answer applies to all commercial truck manufacturers. A fully automatic transmission is clutch free. An autoshift basically adds a synchroniser gear and computer operated shift mechanism to a manual transmission, and still uses a clutch. With an autoshift, poor clutch manipulation often causes the synchroniser gear to go out, making the transmission unable to shift. On a fully automatic transmission, that problem does not exist.
low gear oil or gears are worn.
Automatic Transmission. You can also get semi-automatics where the driver decides what gear to put the car in, but the gear changes are done by an automatic mechanism.
Check
VERY CAREFULLY.
check the fluid level
It matters if you have atuomatic or manual transmission. In an automatic car the gears shift on it's own. In an manual car you shift buy pushing the clutch and then shift from 1st gear to 2 gear.