error codes 03022 and 25796 and fault in the Start Stop system

[rat]

Hello to everybody,

last year I bought a T6 110kW CXH 2015 and now I am suffering from error codes 03022 and 25796 and on top of that there is also a fault in the Start Stop system...

Yesterday I went to a VW authorized service center to replace the EGR and I asked them to look at this problem as well, however, when I handed over the car they told me that they did not know what the problem could be and that I should continue driving with it and wait to see how it goes to develop, which I'm not entirely thrilled about and would like to resolve.

I have a smart alternator and I also noticed that my car is still charging at 14.1V while driving, so the smart alternator is not working as it should, so the voltage does not drop when it is not charging and at the same time the recuperation does not work either, so the voltage does not rise when I brake by the engine and it stays at the constant 14.1V.

Does anyone know what the problem could be?

The only thing I can think of is, could something happen when I accidentally turned on the ignition (without starting the engine) while the charger to the main battery was connected (CTEK MXS 5.0) ?

I will be grateful for any advice.

Thank you very much

rat

 

[Mike23864]

Do you get a ERROR start/stop on the display when you start up?

 

[rat]

Do you get a ERROR start/stop on the display when you start up?

Yes I do

Bellow you can see an ECU list from Carista:

ECU info obtained with Carista 8.0.2 for Android:

VIN: WV2ZZZ7HZGHxxxxxx

CAN network gateway
Part #: 7E0909901
Component: GW-K-CAN TP20
Software version: 0736
ASAM/ODX identifier: [none]
Coding: 042207 (hex)
[No fault codes]

Engine
Part #: 04L906056KM
Component: R4 2.0l TDI
Software version: 6186
ASAM/ODX identifier: EV_ECM20TDI03004L906056KM
Coding: 0019401C432401090000 (hex)
Fault codes:
25796 Manufacturer-specific code

ABS
Part #: 7E0907379P
Component: ESC
Software version: 0132
ASAM/ODX identifier: EV_Brake1ESCCONTIVN75XGP2
Coding: 307E4098256884850C7D027BA48A21D3780000 (hex)
[No fault codes]

Steering angle
Part #: 6R0959654
Component: LENKW.SENSOR
Software version: 0070
ASAM/ODX identifier: EV_LWSKLOVW25X
Coding: 01 (hex)
[No fault codes]

Airbags
Part #: 7E0959655E
Component: VW10Airbag00A
Software version: 0016
ASAM/ODX identifier: EV_AirbaVW10BPAVW12X
Coding: 000000000000000000000000000000003041 (hex)
[No fault codes]

Instrument cluster
Part #: 7E0920870L
Component: KOMBI
Software version: 1008
ASAM/ODX identifier: EV_Kombi_UDS_VDD_RM09
Coding: 1709010300 (hex)
[No fault codes]

Infotainment system
Part #: 5C0035680B
Component: MU-S-N-ER
Software version: 0254
ASAM/ODX identifier: EV_MUStd4CTSAT
Coding: 06570001FF00000011110001000808001F0100C4002001004E (hex)
[No fault codes]

Immobilizer
Part #: 5K0953234
Component: IMMO
Software version: 1008
ASAM/ODX identifier: EV_Immo_UDS_VDD_RM09
Coding: 000000 (hex)
[No fault codes]

Heater & air conditioning
Part #: 7E0907040
Component: ClimatronicT5
Software version: 0508
ASAM/ODX identifier: EV_ClimatronicT5
Coding: 0004000103 (hex)
[No fault codes]

Auxiliary heater
Part #: 7E0963273
Component: STH-T5GP2
Software version: 0007
ASAM/ODX identifier: EV_AuxilParkiHeateWOST5G2
Coding: 4101 (hex)
[No fault codes]

Parking/steering assist
Part #: 7E0919475N
Component: PARKHILFE 8K
Software version: 0205
ASAM/ODX identifier: EV_VW75XParkAssis8K
Coding: 11800C (hex)
[No fault codes]

Central electronics
Part #: 7E0937090
Component: BCM PQ25 Max4
Software version: 0736
ASAM/ODX identifier: [none]
Coding: 62A039380A212092002849747C2B8CDC8FAC710F60C84D60320400230840 (hex)
Fault codes:
03022 Manufacturer-specific code

Battery regulator
Part #: 7E0907534
Component: Batt.regelung
Software version: 0736
ASAM/ODX identifier: [none]
Coding: 030B1A73 (hex)
[No fault codes]

Trailer
Part #: 1K0907383F
Component: Anhaenger
Software version: 0100
ASAM/ODX identifier: [none]
Coding: 0100000100000000 (hex)
[No fault codes]

 

[Mike23864]

I’d definitely be looking at the LIN wire between the alternator and the battery negative as mentioned in this thread.

[Resolved] Start stop error/alternator charge issue ongoing

I've been chasing my tail with this issue for over a year now. Literally spent a couple of thousand trying to sort it and it still won't fix the issue. The garage I use are at a loss too. I have a start stop error on the dash. Also, if I start the van and let it idle, it won't charge the...

www.t6forum.com

 

[rat]

I allready plan to make a visual check of that wire next week when I woulod like to make an oil change, but I checked other threads in this forum and that wire fault is associated with error code 02252 which I do not have problem with.

Is it enought to make only a visual look on that wire or there is needed any resisatnce measuring? I do not have a experiences with wire resisstance measuring but I have a Multimeter which can do that. Any idea what value to measure and how to do it correctly?

Thank you very much

 

[Mike23864]

On mine it was fairly obvious where the likely break was after I removed the corrugated plastic sheath. I did a continuity test on either side which confirmed. New piece of wire spliced in. All good so far.

 

[rat]

So I checked that wire today and there is not any problem in my T6 with that. I checked that wire between fingers and did not feel anything broken or peeled isolation - see attached picture.

Does anyone has any other idea where I can have the problem please?

:-(

 

[mmi]

Engine:
25796 - Body Control Module (Central Electric) - No Communications

BCM:
03022 - Local databus 4 - Electrical Fault in Circuit

I would concentrate on the databus - the LINbus (yellow/green wire) between BCM - sensor at battery negative - alternator.
Check that you have continuity between all three - you need to measure the resistance of the yellow/green wire. You'll see a few ohms - or infinity on broken wire)

Page 162/7 here

T6 - Data Bus Network Wiring Diagram

Circuit Diagrams for the Data Bus Network Covers all wiring between control modules on the drivetrain CAN bus and convenience CAN bus, also includes LIN bus wiring Please check the history/updates tab, first release is for early T6s...

www.t6forum.com

 

[rat]

Hello,
It would be nice if I wrote here the status of how I proceeded with the problem.

The Bus was in the garage until May as I didn't have a time to check it more carefully and drive it anyway. When I took it out of the garage the error persisted but I went on a trip. After returning from the trip I connected the car to the charger, forgot about it and after a few days accidentally started it with the charger connected. To my surprise, I found that the previously displayed errors disappeared and since then the Bus has been running without this problem and I have driven about 1000 miles since that time. I really don't understand but of course I'm glad the problem has gone itself...