My Vag-com trouble codes

[98A4TurboAWD]

My transmission goes into limp mode after a few miles. Here is the vag-com reading.



Control Module Part Number: 8D0 927 156 BN

Component and/or Version: AG5 01V 1.8l5VT USA 8508

Software Coding: 00000

Work Shop Code: WSC 00000

1 Fault Found:

00652 - Gear Monitoring

27-10 - Implausible Signal - Intermittent

---------------------------------------------------------------------------


According to ross tech wiki:
Possible Causes

Automatic Transmission Fluid (ATF) Level not OK
Vehicle Speed Sensor (G68) dirty/faulty
Impulse Wheel dirty or Installation faulty
Gearbox Speed Sensor (G38) dirty/faulty
Impulse Wheel dirty or Installation faulty
Multi-Function Switch (F125) faulty (but not detected)
Clutch or Valve Body faulty
Automatic Transmission Fluid (ATF) Pump faulty

Possible Solutions

Check Automatic Transmission Fluid (ATF) Level
Check/Clean/Replace Vehicle Speed Sensor (G68)
Check/Clean/Replace Gearbox Speed Sensor (G38)
Check/Replace Multi-Function Switch (F125)
Check/Replace Clutch and/or Valve Body


I replaced the vehicle speed sensor with one from ECS tuning, I don't think that's the problem, but you never know. I could try swapping in the old one to rule it out.

The transmission has no signs of leaking, but I will check the level tomorrow.

How common is it for the gearbox speed sensor to go bad? In all my searching about limp mode, that has never come up, but perhaps people got a different code than I got.

I have always seen this problem point to the multifunction switch.

What do you guys think? Where would you start, assuming the ATF level is fine?

[Vierings]

Might try picking this up. I had a similar problem with my old s4
http://www.blauparts.com/proddetail.asp?prod=F2A1007-A

[98A4TurboAWD]

Might try picking this up. I had a similar problem with my old s4
http://www.blauparts.com/proddetail.asp?prod=F2A1007-A

Actually, lucky for me, S&G imports is right down the street and they have the filter kit in stock, and keep the ATF on the floor, at only $75 per gallon for the ATF, and 30 for the filter kit, and it's local, so it works out well for me.

I'd rather not mess with the ATF if I check the level and it is fine. The hard part will be getting the car level without a lift.

[themadscientist]

Change the filter and fluid. Or leave it in there and end up as another tragic TIP story.

Does it slip or ever engage late?

If you have vagcom you can use the measuring blocks in the TCM to see what the MFS and VSS are reporting or not reporting.

Sometimes this code can be an internal mechanical failure.

[98A4TurboAWD]

Change the filter and fluid. Or leave it in there and end up as another tragic TIP story.

Does it slip or ever engage late?

If you have vagcom you can use the measuring blocks in the TCM to see what the MFS and VSS are reporting or not reporting.

Sometimes this code can be an internal mechanical failure.

Not until it goes into limp mode. It shifts fine until the dash lights up.

Once it lights up, it will rev and slip into gear and then it's like it's taking off in the highest gear.

I do not have the registered vag-com so I cannot do what you have said.

I will start by checking the fluid level and cleaning the connections on the transmission.

[themadscientist]

Not until it goes into limp mode. It shifts fine until the dash lights up.

Once it lights up, it will rev and slip into gear and then it's like it's taking off in the highest gear.

I do not have the registered vag-com so I cannot do what you have said.

I will start by checking the fluid level and cleaning the connections on the transmission.

Non registered doesn't do measuring blocks? Damn.

Take it to a shop then. It could also be a bad TCM.

[98A4TurboAWD]

Non registered doesn't do measuring blocks? Damn.

Take it to a shop then. It could also be a bad TCM.

As far as I know. When I clicked that button it said that I must register.

A shop is out of the question. From what I understand the TCM goes bad from water getting into the cabin. I have inspected the area under the carpet and it is clear that there has never been any water intrusion.

I am thinking that it's the transmission range sensor but was curious if anybody had ever had this issue and got it corrected.

It just sucks because each fix is equally expensive. The trans fluid change is as expensive as the range switch. You can't win!

In researching I did find a post and a person who claimed to be a VW tech (this was on a vw forum, not specifically an A4 or even a Passat) and he said that this code was typically cause by low or dirty fluid.

I am perhaps underestimating the seriousness of the quality of the fluid in the trans. I never had a car that would break down because the fluid was dirty.

[themadscientist]

As far as I know. When I clicked that button it said that I must register.

A shop is out of the question. From what I understand the TCM goes bad from water getting into the cabin. I have inspected the area under the carpet and it is clear that there has never been any water intrusion.

I am thinking that it's the transmission range sensor but was curious if anybody had ever had this issue and got it corrected.

It just sucks because each fix is equally expensive. The trans fluid change is as expensive as the range switch. You can't win!

In researching I did find a post and a person who claimed to be a VW tech (this was on a vw forum, not specifically an A4 or even a Passat) and he said that this code was typically cause by low or dirty fluid.

I am perhaps underestimating the seriousness of the quality of the fluid in the trans. I never had a car that would break down because the fluid was dirty.

You can win with the fluid, because it's a service item that should be done every 80k or less. It all depends on the year and specifoic transmission. Honestly, limp mode is a very vague problem, but if it were my own car, I would do a fluid and filter change before anything.

Why is a shop out of the question?

[98A4TurboAWD]

You can win with the fluid, because it's a service item that should be done every 80k or less. It all depends on the year and specifoic transmission. Honestly, limp mode is a very vague problem, but if it were my own car, I would do a fluid and filter change before anything.

Why is a shop out of the question?

Because it's too expensive and I do not know of a shop that I would trust with my car.

[98A4TurboAWD]

I think you're right... I'm going to do a filter and fluid swap tomorrow. I'm not overly optimistic about it fixing the problem though, but you are correct.

[themadscientist]

I think you're right... I'm going to do a filter and fluid swap tomorrow. I'm not overly optimistic about it fixing the problem though, but you are correct.

Gotta start somewhere...

[98A4TurboAWD]

I take back my previous comment about the measuring blocks. It does prompt that registration is necessary, but once I click OK, I can monitor the transmission blocks and see gears and other diagnostic things.

So this car would go into limp mode after just a mile or two since I bought it.

Today I drove it for 15 miles after clearing the transmission fault code. The code would not come back and the car was running pretty good with the exception of one problem.

After a few miles, when it downshifts from a higher gear to 1st, it will not engage right away. Say I come to a stop. It will not engage right away, but after 3 seconds, then I can accelerate as I normally would. It doesn't slip at all once it's in gear and shifts smooth to 2nd, 3rd, 4th, 5th, and tiptronic is just the same.

I took the car out to an empty parking lot that wasn't plowed with a few inches of snow. This quattro is awesome. It's crazy to be in snow like that and just hit the gas and move without slipping at all. I did get a little over confident and made a sharp turn in the snow and I did slide a little but once I let off it grabbed. That is freaking awesome. I've never had AWD, but I think I'm really going to like it.

Anyway, I took videos of what it's doing and it's clear to see that it is fine aside from the slippage going into first gear. I guess I will start now with the fluid check.

If it means anything, upon initial startup it does not have this problem. It's only after a couple of miles that this starts.

Trans never went into limp mode again.

It ran better today than it ever has. This is the first time I've really been able to drive this car. Usually it would go into limp mode after a short amount of time.

I do not know if clearing the code is what made the difference, but that was the only thing that changed from yesterday.

[98A4TurboAWD]

I will continue to update this thread as a future reference for others.

I drove the car until it was warmed up. Pulled it into the garage and left it running while I got it up on jack stands. Checked the car with a level, specifically on multiple parts of the transmission. It was close enough for me. I think the front needed to be up about an 1/8th or so. It was just barley off by a hair in some spots. In other spots that I checked it was perfectly level. I figured this isn't an exact science so one way or the other it's going to be a miniscule amount of fluid either over or under. Whatever.

I shut it down and pulled the check plug. Now from what I read, fluid should spill out. No fluid spilled out. When I put my finger in, I felt no fluid. I drained it and it wasn't as much as I thought it would be. I didn't measure it exactly, but I have a standard oil pan that comes free with an oil change package at advance auto and it was about halfway full, maybe a little less.

The fluid was black, but no chunks or anything were spotted.

I left off after cleaning the trans pan.


Tomorrow I will have my local import shop order me a new filter kit.

I will be installing valvoline max-life ATF.

Before everybody freaks out and tells me I am going to doom my transmission, this ATF is compatible with the factory Esso LT71141 that comes standard, and also the G-052-025-A2 and G-052-162-A1.

Here is a link to a a statement by Valvoline.
http://www.bimmerfest.com/forums/att...5&d=1299595225

I paid $17 for a gallon of this fluid and $4.99 for two extra quarts. I am sure that it will be fine. Unless you know somebody who put this into a perfectly good transmission and it caused catastrophic failure, please to not speculate and tell me I'm screwed and scare others from saving some $ by purchasing this fluid, which is probably just as good.

I will report back with more information after I finish replacing the filter and adding fluid.

I just wish there was a way to get more fluid out of the transmission. This entire procedure is ridiculous.

[98A4TurboAWD]

Fluid was low, the fluid change fixed my slippage problem.

I got a meyle filter/gasket kit. The seal that was on the filter would not fit into the transmission. I almost thought it was the wrong part. In looking at the stock filter and new one, they looked the same. I pulled the seal off the old filter and put it on the new filter. It slipped right in without a problem, so I knew the filter itself was correct.

So I tried to put the seal that came on my new filter into the transmission first, then slide the filter into it. No go. In no way was that thing going into the transmission. For whatever reason, it just wasn't going in and I wasn't about to beat on it to make it work. I ended up reusing the old seal, which was a snug fit and snapped in, allowing me to bolt the new filter on.

Anybody else experience that?

The car took 8 quarts of ATF, and I measured about 4 that came out of my drain pan.

This car is 100% ready to roll and I couldn't be happier. The suspension is rickety and the car needs new shocks all around, and I'll probably want to do control arms in the spring.

I took a driving video after the fluid change.
http://www.youtube.com/watch?v=_pBWgl7CRQU

[themadscientist]

Told ya so :)

I can back up the statement about Max life. I've mixed it with the Audi/VW liquid gold, and I've ran it in boxes that I rebuilt. I haven't seen or had an issue with it. BUT, and there's always a but...

I wouldn't push anymore than 25 or 30k miles on it. It has the life of a typical trans fluid, not the long life of it's high tech CHF/Ravenol counterpart.

[98A4TurboAWD]

Told ya so :)

I can back up the statement about Max life. I've mixed it with the Audi/VW liquid gold, and I've ran it in boxes that I rebuilt. I haven't seen or had an issue with it. BUT, and there's always a but...

I wouldn't push anymore than 25 or 30k miles on it. It has the life of a typical trans fluid, not the long life of it's high tech CHF/Ravenol counterpart.

You called it, thank you!! Amazing difference. Have you ever had a problem getting the filter into the trans with a new seal? Is there a trick to it? I could not get it in with that new orange seal. There's no way it was going in, not even if I tried pushing it in by itself without being on the filter. I thought that was very odd. What do you think?

[themadscientist]

Did you lube it?

[98A4TurboAWD]

Did you lube it?

With new trans fluid, yes. It was not happening man. I did smack on too and it wasn't happening. I said screw it, I'm going to bend or break this thing. It was just cheap plastic. So I tried the seal itself to avoid damage to the filter itself. Still no luck. It felt like it would need a press. The old seal should be fine for the 30k interval that you suggested, so hopefully the next filter I get will fit better.

[themadscientist]

With new trans fluid, yes. It was not happening man. I did smack on too and it wasn't happening. I said screw it, I'm going to bend or break this thing. It was just cheap plastic. So I tried the seal itself to avoid damage to the filter itself. Still no luck. It felt like it would need a press. The old seal should be fine for the 30k interval that you suggested, so hopefully the next filter I get will fit better.

Yep, sounds like an aftermarket fitment issue. You could always grab the OEM seal from the dealer.

[deft]

I have a 1998 Audi A6 C5 2.8 Quattro, 142kw ACK engine, ZF5HP19FLA transmission.
Now I have this problem. When I drive on cruise speed my car shifts smoothly thru all gears, BUT if am in a hurry, it goes 1-2-3-4 then,if I hold the gas pedal on 2000rpm or low, it shifts smoothly to 5th gear, BUT if I push the 4th gear above 2000rpm, it slips and goes into LIMP mode....until OFF & ON.
After driving like for about two years I decided to throw in another transmission and behold...exactly the same problem as the former.
I have tried another TCM on it....same issue.
VCDS suggested changing the Multifunction switch(F125), that I have not done.

[deft]

Mine does everything