Nissan-tcm

Turn the ignition , wait at least one minute, then start the engine and let it idle in Park for one minute to recalibrate.

The is a specialized computer that manages your vehicle's shifting behavior by processing signals from the engine and drivetrain. Over time, the TCM "learns" driving habits, which can sometimes lead to hesitation, jerks, or rough shifting as the stored data becomes outdated or "confused". Resetting and Relearning

When a TCM is physically replaced—often alongside a new valve body or transmission assembly—it must be programmed or "calibrated" to function correctly.