Engine software and gearbox software
The engine control unit manages how the engine delivers torque. On a compatible automatic, the transmission control unit helps decide when to shift and coordinates torque with the engine during a gear change. A gearbox tune changes the transmission calibration. Available adjustments depend on the gearbox and software.
What you might notice behind the wheel
Depending on the calibration, the gearbox may hold a gear longer, choose a different shift point or respond differently to kickdown. Think about where you want a change. A driver who finds the car hunts between gears in traffic has a different goal from someone who wants more predictable shifts on faster roads.
Checking compatibility and condition
Give us the registration, exact model and any existing engine tune. Tell us about slipping, harsh shifts or warning lights so we can discuss whether the gearbox needs diagnosing first. We list Gearbox Tune at £240 and check the transmission and its software before confirming the job.
Further reading xAutomotive’s explanation of shift and torque settings