Mulltiple Fault codes, transfer case problems?

[SpawnyWhippet]

.........I coasted through 5 lanes of fast traffic, stopped and put it into Park, but it didn't engage Park and kept rolling......... I could not engage any forward, reverse or park position.

Apart from all the other issues going on with the 4 wheel drive system, selecting the transmission into Park is a mechanical function of the selector lever via a cable to the gearbox which engages a pawl into a gear inside the transmission and thereby locking it.

If you indeed selected transmission into Park and the car kept rolling, there is a mechanical failure between the tranny selector lever and the transmission.

I thought the same about the Park system, but after the car came back to life, the Park function again operated correctly. Therefore it must have some kind of electronic control overriding it.

I'm still no nearer to a fix. I may have to bite the bullet and take it to my local stealership

[bigbuzuki]

Did you do another scan for the fault codes?

[SpawnyWhippet]

Yes, same codes as the last 2 times. Nothing new.

[bigbuzuki]

Fault message 2053 states a faulty transfer case control unit, not outputting data. Same fault if unit is not powered.

There are several fuses which feed this unit.

Could be prudent to check and reseat them, also check the ground to the control unit.

[SpawnyWhippet]

I really appreciate everyone's time and effort to help me with this problems, thank you.

Where is this control unit located so I can check the ground? I will try to identify and clean the relevant fuses.

At this point, I am considering a shotgun approach and just buying a replacement control module, switches and transfer case motor off fleabay.

Can anyone tell me if control module 0AD 927 755 AM will work on my 04 Turbo Pig, or will I need to get OAD 927 755 AA? The second one was 6 times the price of the first one and looks identical.

[bigbuzuki]

PM me your VIN and I'll check the correct part numbers.

[bigbuzuki]

The correct Porsche part numbers for your VIN are as follows.

955 624 601 01 servo motor

955 618 023 05 transfer case control unit

I dont have the VW equivalent numbers.

[Nacho]

Stupid question, but where is the transfer case control unit located? I think I need to replace either one or both of these parts on my car. I saw a writeup for replacing the servo motor somewhere out on the net, which makes it look like a 20 minute job, but I have yet to find anything mentioning the physical location of the control unit.

I have had the Four Wheel drive system faulty error for a while now, accompanied recently with the PSM failure workshop error icon that is making the rig about worthless to drive.

[bigbuzuki]

Control unit is located under the right front seat.

[wrinkledpants]

Control unit is located under the right front seat.

The transfer case stepper can be purchased from VW for 382. Check VWparts2go for any 04-06 Touareg. I checked on my CTT and it's the same part number. The early versions of the stepper motor ended with an A part number (stamped on the motor itself), but the updated version ends with a C. I'm almost 100% positive everything behind the dash is the same part number (at least in regards to the HVAC unit) as the Touareg. VWparts2go has the cheapest new parts I've been able to find online (got most of my Touareg parts from them). When I cross checked a lot of the flapper solenoids with the VW part, it was quite a bit cheaper.

[SpawnyWhippet]

I replaced my transfer case control module with a $150 used part from a 2006 Turbo S in a wreckers yard and drove for 4 hours at high speed - no errors popped up, where they would usually have appeared within 2 hours. I'll keep an eye on it, but hopefully that's finally fixed.

UPDATE: I got a 4WD fault but no PSM fault today after a short drive, still needs troubleshooting.

Edited March 27, 2014 by SpawnyWhippet

[SpawnyWhippet]

Do you have the VW part numbers for the 95562490801 right hand A/C drive motor (1810 code)? One of mine has gone bad.

The transfer case stepper can be purchased from VW for 382. Check VWparts2go for any 04-06 Touareg. I checked on my CTT and it's the same part number. The early versions of the stepper motor ended with an A part number (stamped on the motor itself), but the updated version ends with a C. I'm almost 100% positive everything behind the dash is the same part number (at least in regards to the HVAC unit) as the Touareg. VWparts2go has the cheapest new parts I've been able to find online (got most of my Touareg parts from them). When I cross checked a lot of the flapper solenoids with the VW part, it was quite a bit cheaper.

[SpawnyWhippet]

OK, I gave up. Took it to my local main dealer, who charged me $200 for diagnostics and found no faults.

On the way home, it did it again, so I sold it dirt cheap for parts or repair on Craigslist. At least the guy buying it knows what he is getting into and seemed not too bothered by it.

The most annoying thing is that I will never know the cause of the error codes and warning lights.

Edited April 8, 2014 by SpawnyWhippet

[bigbuzuki]

Did you change the transfer servo motor?

[SpawnyWhippet]

no, after changing the transfer case control module and all the fluids, cleaning all the terminals and grounds, trying all the fuses, testing the battery then still finding nothing significant with multiple diagnostics, I just lost the will to live with this car.

[bigbuzuki]

Sorry to here about that, but looks like you didn't change the part (servo) that would have solved the issue.

[ekstroemtj]

Very sad to hear. I can understand you in some way but with these cars you need at least two things: patience and a good mechanic or like here some supporting people in a forum. Wish you good luck with your next racer

[Pkscheldt]

Sorry to hear that. I've become good friends with my local service mngr because he's a good guy and because from 2003 to 2013 I had the first CTT in the shop 31 times, Early on most of these visits focused on electronic gremlins, which went away after year five and then came back with a vengeance in year 8 on. I replaced nearly every module in that car from ignition to abs. I've mentioned before that I loved my first CTT, but in the end the gremlins drove me insane! Engine was excellent though.

Cheers!