My Passat only upshifts and downshift at high speeds/RPMs when in Auto Mode

Tiny
TRISTANBOYD
  • 2002 VOLKSWAGEN PASSAT
  • 110,852 MILES

BUT IT ACT WEIRD ONLY IN AUTO MODE. Down shifts in Tiptronic mode are normal and it upshifts on command. It does this everytime we drive it. Here are the facts:
2002 V6, FWD, Auto w/tiptronic mode
110k miles
approximate shift numbers
up shift
1st-2nd ~20Mph
2nd-3rd ~40Mph
3rd-4th ~65Mph
4th-5th ~92Mph

down shift(the ones I can remember)
5th-4th ~62
4th-3rd ~40-45ish (all number are approx anyway)
I cant remember the rest of the way down.
Thanks in advance guys for any wisdom on the subject!

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Friday, February 24th, 2012 AT 4:25 PM

16 Replies

Tiny
FIXITMR
  • MEMBER

Have you checked the fluid level?

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Friday, February 24th, 2012 AT 9:47 PM
Tiny
TRISTANBOYD
  • MEMBER

I have not as checking the trans fluid is not a quick task in these cars and my jack stands are in use by my 65 comet. To check the trans fluid, the car has to be raised for access, level, and running with trans at operating temp to check the level at the fill bolt on the side of thing.

The car hasn't shown any signs of slipping though.

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Friday, February 24th, 2012 AT 10:56 PM
Tiny
RIVERMIKERAT
  • MEMBER

Have it scanned for transmission codes and check the fluid pressure.

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Monday, February 27th, 2012 AT 5:37 PM
Tiny
FIXITMR
  • MEMBER

Also trans box under pass seat may have wiring/plug corrosion.

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Tuesday, February 28th, 2012 AT 12:48 AM
Tiny
TRISTANBOYD
  • MEMBER

I just found something about that when scouring the forums on passat world, I'll check it out tomorrow and post an update!

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Tuesday, February 28th, 2012 AT 2:50 AM
Tiny
TRISTANBOYD
  • MEMBER

I pulled the carpet up today and found the box housing the tcm. There is no signs of moisture ever getting down there and the wiring/box looks like new. I have ordered a obd/usb k-can cable to further help with diagnostics. I will take a picture of the box and wirings and submit them this afternoon

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Wednesday, February 29th, 2012 AT 4:52 PM
Tiny
RIVERMIKERAT
  • MEMBER

We'll be waiting.

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Wednesday, February 29th, 2012 AT 10:45 PM
Tiny
TRISTANBOYD
  • MEMBER

So I know this has been a while since this was last visited but things have been a little crazy. I'm still trying to chase this problem. Since then I've had it scanned with a VAG-COM, no transmission codes. I've also done a filter change. The problem seemed to have lessened for a few hundred miles after the filter change but it could be coincidence. Based on that though, I'm considering having a transmission flush done. What do you think?

Also I was unable to relocate the info about the harness going to the TCM, what should I look for?

Thanks!

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Tuesday, November 20th, 2012 AT 4:12 PM
Tiny
RIVERMIKERAT
  • MEMBER

How many miles on the fluid? What does it look and smell like? Is it red, or is it brown?

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Tuesday, November 20th, 2012 AT 5:14 PM
Tiny
TRISTANBOYD
  • MEMBER

I'm assuming that, with the exception of the fluid I added during the filter change, the fluid is the original. It was not red at all. It was more brown than anything. The car is sitting at 117k miles now.

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Tuesday, November 20th, 2012 AT 5:43 PM
Tiny
RIVERMIKERAT
  • MEMBER

Yeah, flush it. Brown is bad.

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Tuesday, November 20th, 2012 AT 6:08 PM
Tiny
TRISTANBOYD
  • MEMBER

I took the car to VW for a flush and they do not do flushes. They said flushed have a tendancy to be followed by more problems or failure altogether. I did find out that the transmission fluid was actually fine. The tech was kind enough to bring me to the back and compare my fluid with fluid from a brand new sealed bottle. The fluid that VW makes to put into these trannys is brown brand new. I described the problem to him and he believes that it is a solenoid in the valve body that is getting weak. He explained that it could be worn out to the point where it doesn't respond to the electronic pulses sent for regular shifting but that the pulses for tip mode are longer so it still responds to them. Made sense to me, reminded me of having to adjust pulses on an aftermarket keyless entry system to trigger factory locks. He said replacing it is a job that anyone who know his way around a car could do but I am unable to find such solenoid. Would you have any insight about this solenoid or where I could find it? Thanks!

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Wednesday, December 12th, 2012 AT 1:48 AM
Tiny
RIVERMIKERAT
  • MEMBER

No. I wouldn't not off the top of my head, and I'm unable to access our online reference material at the moment,

However, the valve body is easily reached by draining the trans and then pulling the pan. But he is correct. A worn solenoid can cause what you're experiencing.

If the fluid smells like something that's been overcooked, it has.

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Wednesday, December 12th, 2012 AT 1:19 PM
Tiny
TRISTANBOYD
  • MEMBER

Hi, would there be any way to find out what the solenoid is that I would need? I know you were unable to look it up last time but I just wanted to ask. Also, I can't find the flippin donate more to this question button. How do I do that?

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Thursday, January 17th, 2013 AT 4:17 PM
Tiny
RIVERMIKERAT
  • MEMBER

I just looked through our reference materials for about an hour and couldn't find any mention of the solenoid. It's an electronically controlled that is usually located under (above) the valve body in the transmissions I've worked on. It might be somewhere near where the input speed sensor is.

I'll let the admin know you're looking for a "donate again" button. Thank you.

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Thursday, January 17th, 2013 AT 7:02 PM
Tiny
2CARPROS MIKE
  • ADMIN
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We appreciate you considering us for another donation. We should have a donate again button installed soon.

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Thursday, January 17th, 2013 AT 11:29 PM

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