I bought a 2000 (according to the scan - 19 plate) Superb L&K about 2 month ago second hand. A couple of weeks ago the passenger door wouldn't open, either with the internal or external handles. Central locking seemed to sound like it was activating. The following week I started to get lane assist errors. Then the car went into limp mode + lane assist error on one occasion exiting a roundabout behind another car fairly rapidly. These faults appeared intermittent, then got worse. I ordered up an odbeleven to reset the codes. With everything cleared down the lane assist issue disappeared once and I could open the door. Then it reappeared next engine start.

I've pulled out the diagnostic info using the VAG app. Given that there's multiple issues around the left door i'm suspecting a wiring issue?

What would be the best way to diagnose this. There's still a month's worth of warranty on the car, so taking it in to be checked if it is a door lock issue is a possibility, though I'd rather trace it beforehand so I don't end up wasting time.

Error Logs:

OBDeleven data log

Date: 2025-03-27 16:41

VIN:

Car: Skoda Superb

Year: 2020

Engine: DFHA

Mileage: 149486 KM

---------------------------------------------------------------

09 Central Electrics

System description: BCM PQ37BOSCH

Software number: 5Q0937086CF

Software version: 0303

Hardware number: 5Q0937086BR

Hardware version: 038

Serial number: J53F060719002V

ODX name: EV_BodyContrModul1UDSBosc

ODX version: 020001

Long coding: 000000000000000000000000000000000000000000000000000000000000

Subsystems:

System description: 48x RL 280519

Software version: 0121

Hardware version: 032

Serial number: 00000001905230303625

Long coding: 165DDD

System description: RLHS

Software version: 0206

Hardware version: 051

Serial number: SBY19M07D16H04M40S43

Long coding: 0088DF

System description: Sensor, DWA

Software version: 0316

Hardware version: 005

Serial number: 000000000ZY19190093C

System description: Sirene, DWA

Software version: 0007

Hardware version: 004

Serial number: 00000000000000510142

System description: Lenks.Modul

Software version: 0170

Hardware version: H33

Serial number: 0100160720190C104301

System description: SysNameFanLin

Software version: 0101

Hardware version: 014

Serial number: ESE0542736

System description: SysNameFanLin

Software version: 0101

Hardware version: 014

Serial number: ESE0651027

System description: SysNameFanLin

Software version: 0101

Hardware version: 014

Serial number: ESE0932069

System description: SysNameFanLin

Software version: 0101

Hardware version: 014

Serial number: ESE0651021

Trouble codes:

B1330F5 - Anti-theft alarm system sensor Alert - Emergency activation stage 1

static

13 Adaptive Cruise Control

System description: ACC BOSCH MQB

Software number: 5Q0907572R

Software version: 0771

Hardware number: 3Q0907567A

Hardware version: H01

ODX name: EV_ACCBOSCHVW416

ODX version: 003014

Long coding: 320467D359FFC728949C812480400600000000000000000046

Trouble codes:

U112300 - Databus error value received

static

3C Lane Change Assistant Right

System description: HRE3_Kl15_Mst

Software number: 2Q0907686B

Software version: 0149

Hardware number: 2Q0907686B

Hardware version: H06

Serial number: 00000522862771

ODX name: EV_HREntryHellaGen3Kl15

ODX version: 002001

Long coding: 92954640

Trouble codes:

C122C11 - Blind spot recognit. warning lamp in left ext. mirror Short circuit to ground

static

52 Passenger Door

System description: TSG BFS

Software number: 5Q4959592K

Software version: 0480

Hardware number: 5Q4959592K

Hardware version: 007

Serial number: 0000383507623

ODX name: EV_DCU2PasseSideMAXHCONT

ODX version: 001005

Long coding: 001D8020DE01020000001100

Trouble codes:

B122B12 - Central locking motors Short circuit to B+

static

B122D29 - Lock unit for central locking Implausible signal

static

BC Rear Right Door

System description: TSG HBFS

Software number: 8W0959595M

Software version: 0384

Hardware number: 8W0959595J

Hardware version: 010

Serial number: 0000384830150

ODX name: EV_DCU2RearPasseMAXHCONT

ODX version: 001005

Long coding: 001C80208001020000001100

Trouble codes:

B148754 - Motor for window regulator No basic setting

static

Hi,

46 minutes ago, rowanw said:

B122B12 - Central locking motors Short circuit to B+ static

There should be a wire issue indeed. If the locking motor has a short circuit to + in your passenger door, it can't operate as expected. This may be the cause of your problem.

Then, the other code may be a result of the previous one :

48 minutes ago, rowanw said:

B122D29 - Lock unit for central locking Implausible signal static

Regarding the Lane assist system :

48 minutes ago, rowanw said:

C122C11 - Blind spot recognit. warning lamp in left ext. mirror Short circuit to ground

Check the blinker in your mirror. The lamp may need to be replaced, or there could be some rust causing this short to ground.

Considering the Lane Assist deactivates each time you move the blinker stalk, this may be a reason why it doesn't work...

^^^ This man knows!

Who ? Me ?

Well... Let's wait for @rowanw to make some investigations and confirm (or not) my sayings... Then we'll know if I was right... 😉

I think Bap, like MartiniB and Carlston, are specially designed bots of Skoda to keep us satisfied there is always a solution waiting .... 😁

5 hours ago, leolito said:

I think Bap, like MartiniB and Carlston, are specially designed bots of Skoda to keep us satisfied there is always a solution waiting .... 😁

I think you've forgotten ApertureS. The master bot! 😁

8 hours ago, Bap33 said:

I think you've forgotten ApertureS. The master bot! 😁

Of course, H.I. is better than A.I. any day.

No, Aperture goes into a category of its own ... he has trascended the "virtuality" and has made those things real 😁

I think if that project car was to make a trip back to CZ more than one engineer would grab his/her head and pull his/her hair ...

There are a couple of short circuit error codes relating to stuff in the door. I’ve known a few cars (not Skodas) with chafed or broken wires at the door hinge where they flex every time the door is opened or closed. This is where I’d start looking.

I ended up replacing the blind spot light with a second hand working one. This cleared up most of the errors. After that the door lock still didn't work and was showing up in the error scan. Managed to get the lock replaced under warranty so all good now