Another Angle on Torque Converter 17125 Code

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
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Shoppinit
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Post by Shoppinit » Wed Aug 25, 2010 11:07 am

Gareth, we've got the same TCU map and for about the same length of time and I've had zero problems with mine. I don't think it's the TCU, I suspect it's a failing TC.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

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Post by GarethRS » Wed Aug 25, 2010 11:44 am

Shoppinit wrote:Gareth, we've got the same TCU map and for about the same length of time and I've had zero problems with mine. I don't think it's the TCU, I suspect it's a failing TC.
Hi mate,

No, i'm still on the MRC tcu map as I haven't got around to soldering in my MTM chip into my spare TCU.

TBH, I do think it is the TC and i've been in conversations with MRC re a replacement gearbox, but I just wanted to check a few things before I outlay lots of cash.

Yesterday I put in my standard TCU and i'll take it out for a good thrashing sometime this week :) .

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Shoppinit
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Post by Shoppinit » Wed Aug 25, 2010 12:19 pm

Sorry, mate. I confused MTM and MRC for a second... I should really learn to read better!
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

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Post by bam_bam » Wed Aug 25, 2010 12:57 pm

Is it possible that the BLS is failing without throwing an error?

After replacing the BLS I've not seen the "17125 - Torque Converter Clutch: Stuck OFF / No Power being transferred" error since. It's only an £8 replacement part and takes about 30mins to fit.
I don't like that the BLS can fail leaving us to drive around with the TC stuck open, can't be good for the TC longevity!?!?
No matter where you go, there you are.

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Post by GarethRS » Wed Aug 25, 2010 1:46 pm

Hi, I'm happy to try anything first, I have almost resided to the fact that as my car is approaching 60k, the tc is on it's way to the big tc grave in the sky.

Do you have a part number? I assume it just screws into the gearbox.
Thanks

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Shoppinit
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Post by Shoppinit » Wed Aug 25, 2010 2:04 pm

Having the TC stuck open is probably better for longevity since the clutches are not doing any work and getting used up. Used to be that the TCs didn't have lock-up clutches at all :)

The brake light switch is what bambam is talking about and it's definitely worth a shot...

http://www.flickr.com/photos/surgenor/s ... 52/detail/
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

bam_bam
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Post by bam_bam » Wed Aug 25, 2010 2:24 pm

It doesn't just screw into the gearbox, it's a plunger connected to the brake pedal under the dash. I know it sounds weird but if the car thinks you've got your foot on the brake it'll open the TC, hence, if the BLS is faulty, the TC stays open.
No matter where you go, there you are.

GarethRS
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Post by GarethRS » Wed Aug 25, 2010 5:48 pm

Wouldn't the brake lights be on or flickering. Not that u'd notice from the drivers seat, lol

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Post by bam_bam » Wed Aug 25, 2010 6:28 pm

Sometimes but I'd read not always, seems like a pretty flakey part to me.
No matter where you go, there you are.

GarethRS
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Post by GarethRS » Thu Aug 26, 2010 10:07 am

Looks like its tha same switch in my wife's VW touran, i'll just pinch it out of that, lol.

bam_bam
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Post by bam_bam » Tue Aug 31, 2010 1:34 pm

Hi Gareth,

Any news on this? Did you replace the BLS and, if so, did the 17125 case come back?
No matter where you go, there you are.

GarethRS
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Post by GarethRS » Thu Sep 02, 2010 4:36 pm

Hi,

I swapped over the tcu with my standard unit, but I haven't driven the car yet :( . Not touched the switch yet.

Might take it to work tomorrow.

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RsMagic
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Another Angle on Torque Converter 17125 Code

Post by RsMagic » Wed Jan 25, 2012 6:17 pm

Just reading up on this old post,

I've had the car down mrc two or three weeks ago, I had no codes back then.

Had the codes checked again and have hade the BLS fault and the 17125 come in together,

Can any one confirm that they are deffo related, obviously I could have a a fault with both, but does the BLS cause the 17125 fault?

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Shoppinit
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Re: Another Angle on Torque Converter 17125 Code

Post by Shoppinit » Wed Jan 25, 2012 7:06 pm

Could be. Better start praying that that's the case...
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

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