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Car was driving and shifting fine for 2hrs then I came to a stop and when I took off again it would only go 20mph and revved up to 3500rpms and would not shift. Also throwing codes P0234 turbocharger/supercharger "A" Overboost condition and a coolant thermostats sensor P0128

Vehicle: 2005 volksawagen jetta GL TDI 1.9L

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P0234 Turbocharger overboost condition

P0128 Thermostat below regulating temperature

Check the transmission fluid level, low fluid level can set this code , having the transmission slip would set a P0234 condition, Most every VW has a P0128 but you should always check for coolant leak especially at the thermostat housing area. Most important check the transmission fluid level.

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