The most common symptoms of a faulty Gear Shift/Stick are:

Vehicle does not drive forward/back with the pedal but works with remote.
Vehicle drives forward but not on reverse.
Vehicle drives on reverse but not forward.

Depending on the symptoms above, here are a few ways you can troubleshoot a faulty Gear Shift/Stick

Before proceeding with the below, make sure the MainBoard/Speed Controller connections are all in place as this could also prevent it from working in forward or reverse. You should also check the MainBoard/Speed Controller troubleshooting guide the eliminate this as the culprit. You can find the guide here.
Make sure the gear stick wires are connected by simply removing the screws next to the gear stick and removing this from the body to check that the wires have not been dislodged.
If the wires are connected, this could mean that the Gear Stick is faulty and will need replacing.
If the gear stick will physically not go into forward or reverse you will need to replace the gearstick.

Here's a quick video showing you how to replace a faulty Gear Shift/Stick

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