Passat b8 2015 Bitdi CUAA+QAX

   #1  

peter_sakal

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Hello,

I would like to ask, I have Passat B8 EU ver. from 2015. CUAA eng. code and cod of Trans. QAX. (DQ500)
On the internet I saw that Passat had also other variants of the DQ500 I think how production went (TJL etc)
My question is when I buy gearbox with code TJL but originally I have QAX code is it possible to code it or adjust it to my early version of CUAA engine ?
Prices are better for TJL also there is no many QAX on the market.

reason : my gearbox needs to change clutch pack, than it wierd noises comming from gearbox when its downshifiting,
it has 260 000km.

thank you
 
   #2  

MrMeeseeks

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Gear ratios may differ on TJL compared to QAX, meaning shift point RPM and speeds will be different.
 
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siLc

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TJL is not a valid replacement for QAX in a Passat B8 CUAA. You can use RCG and SDR boxes. TJL is for CUAA in a Tiguan and Kodiaq.
 
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Dr Sheldon

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TJL is not a valid replacement for QAX in a Passat B8 CUAA. You can use RCG and SDR boxes. TJL is for CUAA in a Tiguan and Kodiaq.
But why take a risk ??

If it came with QAX then rely on the $$ ££ millions VAG spent on research and testing to marry that box with that lump in that car ?
 
   #5  

stefdds

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Also, it sure would not hurt to Post a Auto-Scan from a Legitimate RT product/interface ; you can get one from a friend or service center and then post it here. Just be sure it is a Legitimate interface. It would be wise to do this first before you purchase or install any used part.
 
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iichel

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passat typically has the longest gear ratios of the passenger cars. tiguan shorter gears due to larger wheels.
 
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   #8  

peter_sakal

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doesnt need scan because the ECU is pure original and there no any code in memorry, problem is that I think is it mechanicly worn out.
Many people looked at it, mechatronic has been repaired, sw update has been done, so many time adpatation was made still it is bad,
so many money spend on nothing just on people who might know what are they recomend or do
 
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   #9  

siLc

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Don't forget - MQB has Component Protection on the DSG mechatronic. So plan a dealer visit or transfer your old mechatronic to the "new" box.
 
   #10  

PetrolDave

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doesnt need scan because the ECU is pure original and there no any code in memorry
Lack of a fault code is NOT a good reason not to do a scan, as I said doing a scan BEFORE you change anything gives you two thngs:
1) coding information for the future WHEN something goes wrong
2) information of modules fitted and part numbers.

Thinking that an Auto-Scan is only about fault codes is misguided.
 
   #12  

MrMeeseeks

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But why take a risk ??

If it came with QAX then rely on the $$ ££ millions VAG spent on research and testing to marry that box with that lump in that car ?
You must have missed this line of thought from the OP: "Prices are better for TJL also there is no many QAX on the market"

You wouldn't have needed to answer so rudely if you'd read and understood what he was asking. He doesn't know if the boxes are the same or not, hence the question.
 
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Dr Sheldon

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But why take a risk ??

If it came with QAX then rely on the $$ ££ millions VAG spent on research and testing to marry that box with that lump in that car ?
You wouldn't have needed to answer so rudely if you'd read and understood what he was asking.
I dont see any thing near rude in my answer !! And I understand exactly what he is asking !
 
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