Change fluid start there
SOURCE: VW Jetta 2004 wont shift gears after running fine for some time
The
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem. The
engine and the automatic transmission (transmission control is only
for automatics, engine is still computer controlled no matter the
transmission type) in this vehicle are computer controlled and in
most cases when a fault occurs a fault code is stored in the memory
of the computer control module. There are exception to this, such as
the Mass Airflow Meter and fuel pressure problems. What must be done
is to have all the basic testing done such as a scan of the system
for fault codes as well as a check with a live data scanner tool for
engine functions that are not within range of normal, a trained
technician is required to know what is correct and what isn't, then
based on careful diagnostics done from a factory repair manual the
correct part is replaced or the wiring repaired or the computer
replaced (known as the PCM), which is very rarely the problem. Other
basic checks must be done as well such as mechanical problems with
the engine as well as engine state of tune and mileage on the engine.
The transmission can have mechanical issues as well such as no gear
engagement at all or a failed pump or other pressure related
problems. Also engine mechanical problems ca cause many
drive-ability related problem such as rough idle and other symptoms
SOURCE: 2004 mazda3 wont shift into 4th gear
Sounds like it needs a transmission. Try JDMengines.com
SOURCE: 1996 Saturn auto trans will not shift into 4th
Check your transmission fluid. If it is bright almost pinkish-red then it is not the transmission. If it is dark red or brown then you need to either get a flush done or replace your transmission depending on the severity.
SOURCE: 2000 vw jetta 1.8 automatic shifts hard between 3rd and 4th gear
2000 VW Jetta, Autmatic, 2 L: Front end vibrates between 25-30 MPH when accelerating under torque, feel like it may becoming trom the transmission. Have replaced, balanced and aligned the front two tires.
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