Van went into limp mode.

[iamrinswind]

Hi all, hoping someone might have an idea about what happen to me today.

2021 T6.1 204 bi-tdi 4 Motion DSG

Started up this morning, short drive to an appointment. Almost straight away the glow plug light was flashing and van in limp mode. As it was not far, carried on to destination. When I started it again a few minutes later, everything was back to normal.

Did a VCDS scan and came up with a few errors (I've left out the bits that are ok)

Any insight as to what happened would be amazing - Thank you.

VCDS:

Address 01: Engine (J623-DMZA)
1 Fault Found:
21384 - Turbo / Supercharger B
P02CB 00 [01100000] - Pressure too Low
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 1
Reset counter: 40
Mileage: 67701 km
Date: 2026.02.28
Time: 09:16:09

Engine speed: 2187.00 /min
Normed load value: 40.0 %
Vehicle speed: 27 km/h
Coolant temperature: 21 C
Intake air temperature: 8 C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 12.080 V
Unlearning counter according OBD: 40
Charge air pressure: specified value: 2156 hPa
Mass airflow sensor 1 bank 1 airflow: raw value: 676.7 mg/stroke
Turboc.1 turbin.bypass valve 1 B. 1: pos.feedback - Actual value: 99.80 %
Mean injection quantity: 28.21 mg/stroke

Readiness: 0000 0000
--------
Address 03: ABS Brakes (J104) Labels: 7LX-614-517-V1.clb
Part No SW: 7LA 614 517 B HW: 7LA 614 517
Component: ESC_high H01 0800
Serial number: 08503301211022
Coding: 10554752C84BE686085AE2AA136C6726393724B8
Shop #: WSC 00012 790 00077
ASAM Dataset: EV_Brake1ESP90iBOSCHVN46X 003012
ROD: EV_Brake1ESP90iBOSCHVN46X_003.rod
VCID: 3E22DDCF30F0B60ABCF-806A

1 Fault Found:
1209 - Databus
U1123 00 [00001000] - Received Error Message
[SCL_ACC_Anhalteweg_Error]
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 3
Fault Frequency: 1
Reset counter: 40
Mileage: 67701 km
Date: 2026.02.28
Time: 09:16:10
------
Address 13: Auto Dist. Reg (J428) Labels:| 2Q0-907-572.clb
Part No SW: 2Q0 907 572 R HW: 2Q0 907 572 B
Component: ACCCONTIMQB H03 0372
Dataset Number: V03935335RG 0001
Coding: 3200670201FF8748949C815580508700000000000000000004
Shop #: WSC 00012 790 00044
ASAM Dataset: EV_ACCMRRCONTIVW376 003016
ROD: EV_ACCMRRCONTIVW376_VW41.rod
VCID: 43D4AC3B5B12DBE2D31-8016

3 Faults Found:
2111 - Databus
U1123 00 [00001000] - Received Error Message
[FAULT_ESP_CONS_ACC]
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 4
Fault Frequency: 1
Reset counter: 214
Mileage: 67701 km
Date: 2026.02.28
Time: 09:16:10

Voltage terminal 15: 12.1 V
Control Module temperature: 15 C
Vehicle speed: 7.45 m/s
Longitudinal acceleration: 1.19 m/s
Adaptive distance regulation: status: ACC_irreversible error

0928 - Databus
U1122 00 [00001000] - Implausible Message
[FAULT_STOPPING_DISTANCE_CONTROL_NOT_AVAILABLE]
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 6
Fault Frequency: 1
Reset counter: 214
Mileage: 67701 km
Date: 2026.02.28
Time: 09:16:10

Voltage terminal 15: 12.2 V
Control Module temperature: 15 C
Vehicle speed: 7.45 m/s
Longitudinal acceleration: 1.13 m/s
Adaptive distance regulation: status: ACC_irreversible error

2068 - Databus
U1123 00 [00001000] - Received Error Message
[FAULT_TSK_IRREV_FAIL]
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 6
Fault Frequency: 1
Reset counter: 214
Mileage: 67701 km
Date: 2026.02.28
Time: 09:16:09

Voltage terminal 15: 12.1 V
Control Module temperature: 14 C
Vehicle speed: 7.64 m/s
Longitudinal acceleration: 1.06 m/s
Adaptive distance regulation: status: ACC_StandBy

 

[mmi]

Please post the following

1) Full VCDS Auto-Scan
2) Engine blockmap - Ignition ON/engine OFF
3) Engine blockmap - Engine running at idle
4) Engine blockmap - Engine running at idle after 3 minutes

---

How-to create a blockmap file:

[VCDS]
[Applications]
[Controller Channel Map]
- Single Controller Address = 01
- Login or security access code: Leave blank
- Function: Measuring values
- Output: CSV file
[Go]

---

The result (TXT and CSV) files are saved into directory C:\Ross-Tech\VCDS\Logs
Please attach the files here.

 

[iamrinswind]

mmi,

Thank you for the reply.

See attached files:

 

[mmi]

mmi,

Thank you for the reply.

See attached files:

Thanks. Nothing obvious in the maps - a kind of expected as the fault obviously wasn't on at the moment of logging.
Collected the following turbo related data items (as a reference).

Charge air pressure: specified value: 2156 hPa

Perhaps it's good to check air hoses for cracks or loose joints as at the moment of the fault there was quite a high boost demand.

 

[iamrinswind]

mmi,

Thank you for looking at it. Very much appreciated.

What I found strange was that as soon as the van was restarted (after been off for a few minutes), everything seemed to be ok.

Thinking back over the circumstances: I first started the van from cold, then pulled out of the parking space and up a reasonably steep hill. It was fairly soon into the hill that the van lost power and was in limp mode. Is it possible that this might explain the high boost demand?

 

[mmi]

What I found strange was that as soon as the van was restarted (after been off for a few minutes), everything seemed to be ok.

That's normal behaviour to clear the limp mode - till the failure is detected again.

Thinking back over the circumstances: I first started the van from cold, then pulled out of the parking space and up a reasonably steep hill. It was fairly soon into the hill that the van lost power and was in limp mode. Is it possible that this might explain the high boost demand?

Obviously yes. But still the engine normally can handle such a situation, i.e can produce the requested boost.