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2004 R5 VW Touareg auto. PPRND21S lights on dash not

2004 R5 VW Touareg auto.PPRND21S...
2004 R5 VW Touareg auto.PPRND21S lights on dash not working, transmission in limp home, ESP light on. I have a VCDS but the CAN Bus isn't connecting to the ECU.
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Answered in 19 minutes by:
1/14/2018
Wolfgang
Wolfgang, VW Master Technician
Category: VW
Satisfied Customers: 5,250
Experience: Senior VW Master Tech 15 yrs
Verified

Welcome, I'm Wolfgang.

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I do need a picture of the dash when running please to verify something.

in the spare tire are is a white sticker 3x5 that has the option codes. can you provide the pic of the whole options sticker please to pull up the factory information to assist. please see attached file for example

thanks

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Customer reply replied 7 months ago
Hi Wolfgang, pictures attached.
Does the vehicle start and run?
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Customer reply replied 7 months ago
The engine starts easily and runs perfectly. The transmission is in limp mode/

can you connect to 01 engine electronics?

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Customer reply replied 7 months ago
I don't know what that means. I have an ELM327 but it says it's not connected to the ECU. I have a Ross-Tech Mini-CAN but it's the wrong one for my car.

ok mini can does not work with touareg. elm has issues too . do you have access to another scan tool for a test.

if you are looking for ross tech hex can will work.

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Customer reply replied 7 months ago
I don't have any other scan tools. I'm looking at trading the Mini-CAN for a HEX V2 as long as the postage doesn't kill the deal.

there is a chinese clone that you can get for a pretty good price

let me get that site for you .

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Customer reply replied 7 months ago
All the guys on Club Touareg warn against using the clones, they say that they can fry the ECU.
But some of those guys are really pedantic. There's one who changes out his tyres when they're only half worn. So, is this clone safe to use? You use it with the VCDS from Ross Tech?
Customer reply replied 7 months ago
$67 is cheap. I'll get it if you say it's safe to use.
Have you any idea what would have caused the problem in the first place?
If taken the gear selector apart, the magnets are in the right place and it's clean in there with no obstructions.

trans ecu off line

i have used clones just do not update the cable

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Customer reply replied 7 months ago
What would cause the trans ECU to go offline and how do I get it back on?

need to check powers and grounds

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Customer reply replied 7 months ago
Where is it located?

under the drivers seat there should be 2 modules

one is the 4wd module and the other is the trans module.

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Customer reply replied 7 months ago
I'll have a look. Thanks.
Customer reply replied 7 months ago
My car is RHD, still under the driver's seat? Left side has the battery.

yes correct!!

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any new updates?

please do let me know!!

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Customer reply replied 7 months ago
I'm going to take the seat out today and check for any obvious problems.
No need to take the seat out from the back seat you have access
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Customer reply replied 7 months ago
Ok, thanks.
Customer reply replied 7 months ago
I couldn't get to the TCM without taking the seat out. I had to fix some airbag wires anyway.
I can't see anything obvious, no water damage or burns.

did you unhook the connector and did you see transmission fluid in the connector (very common for this issue)

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Customer reply replied 7 months ago
I did unhook the connector, looking for corrosion, but didn't see any oil. I've heard about that, I didn't know it was common though. A guy on Club Touareg was quoted $14,000 in 2012 to replace the loom and TCM because of oil creeping up into the TCM. In the end technicians replaced some pins in the connectors.

ok since there is no corrosion and oil extensive diagnosis is needed with scan tool and DVOM this will require premium service .

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please do let me know

thanks

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Customer reply replied 7 months ago
I'll have to wait 'til the cable gets here so I can get the codes to you.
Ok thanks
Wolfgang
Wolfgang, VW Master Technician
Category: VW
Satisfied Customers: 5,250
Experience: Senior VW Master Tech 15 yrs
Verified
Wolfgang and 87 other VW Specialists are ready to help you
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Customer reply replied 6 months ago
Where does the TCM get it's power from?
Terminal 30 just means unswitched power.

ok pin 1 and 2 are ground

powers are at pins 3 , 27 , 28 with the key on !!

correct 30 is constant power

15 is ignition power

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Customer reply replied 6 months ago
There's no power getting to the TCM, where is it supposed to come from?
Let me get that. Give me a bit
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Customer reply replied 6 months ago
Do you have a diagram of where those pin numbers are? I can't see numbers on the plug or TCM.

here is the connector pinout!!

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Customer reply replied 6 months ago
Thanks. I test with the cable plugged in to the module?

no check it unplugged!!

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Customer reply replied 6 months ago
Aha. Thanks.
Customer reply replied 6 months ago
Is there a way to test the module itself?

no. if you have powers and grounds then you have module failure!!

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Customer reply replied 6 months ago
Ok, 27&28 are ground (brown wires) 1&2 blue wires no power and 3 haspower.
Customer reply replied 6 months ago
Can I jump power to 1&2 to see if that does anything?
Customer reply replied 6 months ago
Where are they supposed to get the power from?

please see email . thanks

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