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I think you will find it is called 'Limp Mode'. It is the Engine Control Module finding a fault so serious that is might permanently damage the vehicle. You need to connect it to a Scan Tool and read the codes. The codes tell you the problem and the fix.
No. As with any vehicle, maintain clean transmission fluid, and the car will serve you well. However, the 2002 S80 does have a high frequency of instrument cluster failure.
your car is going in "limp" mode, the computer is seeing a problem with a sensor on the transmission,so it won't up shift because it doesn't know how fast your going. check the speed sensor,the input sensor,and the output sensor.one of these is not working correctly, it will help when you have the car checked for codes,look for history codes section. cycling the key resets the soft code but it will always return until repaired.
There are three ecu settings? gearbox / main ecu / and center control, they all will need to be updated then a process called learning cycle which has to be reset by the technicians, then the car needs to be driven to adapt the new transmission.
Most likely your mechanic is right. The reason it will shift normally for a little while is because when it does detect the problem it goes into a limp home mode. When you reset the battery it takes it out of limp home mode until it sees the problem again.
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