Transmission shifting problem

This is a hard one due to two a length of time it takes to occur. It may be something sticking inside the transmission. Try adding some Lucas transmission treatment and see if there works. If it doesn't help you will need to take you to a good VW transmission shop. Good luck

Hi,

I suspect that when the vehicle is warmed up and driven that far, there may be a loss of line pressure in the transmission, That can be caused by a couple things. First, make sure the transmission fluid is clean and full. If it is and there are no diagnostic trouble codes specific to the transmission issue, I would recommend checking transmission line pressure. You will need a pressure gauge and VAG software to make checks. Here are the directions of how it is done. The attached pictures will correlate with the directions.

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2003 Volkswagen Jetta Sedan (9M2) L4-2.0L (AVH)
Main Pressure, Checking
Vehicle Transmission and Drivetrain Automatic Transmission/Transaxle Testing and Inspection Component Tests and General Diagnostics 4 Speed Automatic 01M Main Pressure, Checking
MAIN PRESSURE, CHECKING
4 Speed Automatic 01M

Main pressure, checking

Conditions for performing check

- Diagnostic Trouble Code (DTC) memory checked
When the DTC memory is checked, the following display should appear:
"No DTC recognized!"
- ATF level OK

Special tools and equipment

pic 1

- V.A.G 1702 Pressure tester

pic 2

- Remove bolt -arrow- for main pressure port. Always replace bolt.
- Connect pressure tester V.A.G 1702 and tighten thumb screw.
- Start engine.
- Bleed pressure tester V.A.G 1702. To do this, loosen thumb screw and tighten when bleeding is complete.
If V.A.G1551 is used:

pic 3

- Remove Data Link Connector (DLC) cover -1-.
- With ignition switched off, connect V.A.G 1551 Scan Tool with diagnosis cable V.A.G 1551/3A.

Pic 4

Indicated on display
1) appears alternately
- Start engine.
- Press key 1 for "Rapid data transfer" mode.

Pic 5

Indicated on display
- Press keys O and 2 to select address word "Transmission electronics".

Pic 6

Indicated on display
- Confirm entry with key Q.

Pic 7

Indicated on display
- Press keys 0 and 8 to select function "Read measured value block".

Pic 8

Indicated on display
- Confirm entry with key Q.

Pic 9

Indicated on display
- Press keys 0, 0, and 5 to select "Display group number 005".
- Confirm entry with key Q.

Pic 10

Indicated on display
The first display zone shows the ATF temperature.
- Allow ATF temperature to rise to 60°C.

Main pressure specifications at idle

pic 11

pic 12

If there are deviations from the prescribed values, the following could be the cause:

- Switch engine off.

Pic 13

Solenoid valve connector
- Press fuse together and pull off connector.
- Start engine.

Main pressure specifications at 2000 rpm

pic 14

If possible, the main pressure test should be performed on a rolling road.

Pic 15

If there are deviations from the prescribed values:
- After test is complete, disconnect pressure tester V.A.G 1702.
- Install new bolt for main pressure port and tighten to 15 Nm.
- Fit solenoid valve connector.
- Once connector has been fitted, check and erase DTC memory.
- If necessary, install sound insulation.

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Let us know what you find and if the pressure specs are within the manufacturer's recommendations.

Take care,
Joe

I'm assuming it's an automatic?

40 = 4000 (1/min x 100) rpm (revolutions per minute)

4 speed automatic? 5 or 6 speed tiptronic? (Transmission code would help as well as a scan for fault codes).

Does it shift OK when in Manual mode?

Did you check / add fluid at the correct time? Needs to be checked while in park, running and between 35c to 45c.

Have you done basic settings via scan tool? Have you tried to re-code the control module to Economy mode (if 01M Tranny)?

Just some thoughts that might help the experts answer your concerns. Provided you reply back with more info.

Thomas

Must have fixed itself?

An out time engine will cause the transmission not to shift correctly to include an engine needing a tune-up

If your timing belt is off, you WILL have a "camshaft position sensor allocation" or "range performance" code. If your MIL is off, your timing is on.

Please post the faults so I can help you out.

Check and test the throttle poisition and vehicle speed sensors if okay get the transmission checked out could be a problem with a shifting solenoid/s

Could be the O2 sensor not switching accordingly to provide the fuel demand during acceleration

Any codes in the computer?A hard shift usually means there is too much pressure. We need to check for codes and also perform a transmission pressure test.