2001 volkswagon jetta wont shift passed second gear its an automatic

HI. I would inspect the transmission fluid level, asap. This is the first issue that may cause this no shift. Low fluid level can damage the gear assembly, if it is not at a optimal level. If the fluid is at an acceptable level, this will lead to a failed shift solenoid. These devices are located inside the transmission, mounted on the valve body. You will need to remove the transmission pan, in order to, expose the shift solenoid. there are three(control,kickdown,OD). The solenoid at question, will be your control solenoid(shift). This damaged device will need to be tested for proper Resistance, or continuity. A multimeter can be used for testing. Each solenoid is equipped with two terminals. use these terminals for testing. This will , also, require you to drain all the transmission fluid, as well.


NOTE_ If you are uncomfortable with disassembling the transmission, i would suggest to contact your local mechanic for this inspection, and repair.