These are the steps you can take:Slow down to below 100kph till the error disappearsEnsure that the car has enough transmission fluid If you haven't serviced the gearbox for the last 50,000km or more, do so by changing the gearbox oil with original recommended oil for the gearbox.If the problem persists, change both the gearbox oil and sieve. You can also consider adding an extra radiator / cooler specifically for the gearbox. This is usually way smaller than the usual car radiator. ...