Hi There.

 

So my ad has had my Skoda for a couple of weeks now, and on his way home from work it startet faulting showing the engine coil symbol blinking and later an engine lamp.

 

I tried reading the faultcodes, after that i reset them and read them again after 50 meters of driving when they came on again.

 

These are the fault codes:

Quote

01. Engine control unit01. Engine control unit
DTCs: 1
----------------------------
16409 [0x004019]
P00AF00: Turbocharger/Supercharger Boost Control "A" Module, Performance
Status bits: 1
Priority: 2
Frequency: 1
Unlearning index: 255
Odometer: 204105 km
Date, time: 2025.02.11 15:26:31
Engine RPM: 1483 rpm
Calculated engine load value: 99.22 %
Vehicle speed: 27 km/h
Engine coolant temperature: 69 ℃
Engine oil temperature: 22 ℃
Barometric pressure: 14.793849276714 psi
Klemme 30 voltage: 14
Paramteric values:  20 96 28 44 A5 26 BD 44 BA 04 41 44 B9 00 F3 44 8D 0E CB 44 D0 12 C0
Status: Pending, Test failed since last DTC clear, Test not completed during this operation cycle
============================
08. Heater and climate08. Heater and climate
DTCs: 1
----------------------------
1048835 [0x100103] Archive (inactive)
P171900: Function restriction by engine control module
PTC-Reduzierung durch MSG
Status bits: 1
Priority: 6
Frequency: 1
Unlearning index: 185
Odometer: 204105 km
Date, time: 2025.02.11 15:26:46
Paramteric values:  02 86 8D 27 C1 B2
Status: Confirmed
============================
13. Active cruise control13. Active cruise control
DTCs: 1
----------------------------
02068 [0x000814] Archive (inactive)
U112300: Databus error value received
FAULT_TSK_IRREV_FAIL
Status bits: 1
Priority: 6
Frequency: 1
Unlearning index: 185
Odometer: 204105 km
Date, time: 2025.02.11 15:26:31
Paramteric values:  02 8D 50 02 85 91 10 11 07 6D 10 12 06 52 10 2E 02
Status: Confirmed

 

I think the DTC 16409 is the trigger am i right?

 

Anyone know what i should look for?

 

Edit: I forgot that you might want to have the codes from before resetting:

 

Quote

09. Onboard supply control unit09. Onboard supply control unit
DTCs: 2
----------------------------
204546 [0x031F02] Archive (inactive)
B147A18: Remote key 2, Voltage too low
Funkschlüssel 2-unterer Grenzwert unterschritten
Status bits: 1
Priority: 4
Frequency: 2
Unlearning index: 40
Odometer: 202341 km
Date, time: 2025.01.02 16:31:04
Status: Confirmed
----------------------------
197904 [0x030510] Archive (inactive)
B140A4B: Central locking, Excess temp.
Zentralverriegelung-Thermoschutz (ZV-Spielschutz) aktiv
Status: Confirmed
============================
01. Engine control unit01. Engine control unit
DTCs: 2
----------------------------
23957 [0x005D95]
P029900: Turbo/Super Charger Underboost
Status bits: 1
Priority: 2
Frequency: 1
Unlearning index: 255
Odometer: 203968 km
Date, time: 2025.02.11 06:13:18
Engine RPM: 2204 rpm
Calculated engine load value: 99.61 %
Vehicle speed: 77 km/h
Engine coolant temperature: 17 ℃
Engine oil temperature: 3 ℃
Barometric pressure: 14.793849276714 psi
Klemme 30 voltage: 14
Paramteric values:  20 96 28 20 29 08 DD 44 5A 04 96 44 C9 14 3D 44 6A 00 07 44 A7 00 00 44 BA 04 78 20 97 00 1D
Status: Pending, Test failed since last DTC clear, Test not completed during this operation cycle
----------------------------
25958 [0x006566]
P029900: Turbo/Super Charger Underboost
Status bits: 1
Priority: 2
Frequency: 1
Unlearning index: 255
Odometer: 203968 km
Date, time: 2025.02.11 06:13:18
Engine RPM: 2203 rpm
Calculated engine load value: 99.61 %
Vehicle speed: 77 km/h
Engine coolant temperature: 17 ℃
Engine oil temperature: 3 ℃
Barometric pressure: 14.793849276714 psi
Klemme 30 voltage: 14
Paramteric values:  20 96 28 20 29 08 DD 44 5A 04 96 44 C9 14 30 44 6A 00 07 44 A7 00 00 44 BA 04 78 20 97 00 1D
Status: Pending, Test failed since last DTC clear, Test not completed during this operation cycle
============================
08. Heater and climate08. Heater and climate
DTCs: 1
----------------------------
1048835 [0x100103] Archive (inactive)
P171900: Function restriction by engine control module
PTC-Reduzierung durch MSG
Status bits: 1
Priority: 6
Frequency: 135
Unlearning index: 185
Odometer: 199013 km
Date, time: 2024.11.02 09:48:12
Paramteric values:  02 86 8C 27 C1 F3
Status: Confirmed
============================
13. Active cruise control13. Active cruise control
DTCs: 5
----------------------------
01538 [0x000602] Archive (inactive)
C110BF0: Adaptive cruise control sensor, Restricted view
FAULT_SENSOR_BLIND
C10A800: Wheel diameter implausible
FAULT_EVI_TIRE_SIZE
Status bits: 1
Priority: 4
Frequency: 1
Unlearning index: 162
Odometer: 203255 km
Date, time: 2025.01.23 06:54:28
Paramteric values:  02 8D 41 02 85 92 10 11 18 55 10 12 02 DB 10 2E 02
Status: Confirmed
----------------------------
01396 [0x000574] Archive (inactive)
C110BF0: Adaptive cruise control sensor, Restricted view
FAULT_SENSOR_NO_FREE_SIGHT
Status bits: 1
Priority: 4
Frequency: 1
Unlearning index: 162
Odometer: 203268 km
Date, time: 2025.01.23 15:03:21
Paramteric values:  02 8D 39 02 85 55 10 11 00 00 10 12 00 00 10 2E 01
Status: Confirmed
----------------------------
01542 [0x000606] Archive (inactive)
C110BF0: Adaptive cruise control sensor, Restricted view
FAULT_SYSTEM_BLIND
Status bits: 1
Priority: 4
Frequency: 1
Unlearning index: 162
Odometer: 203258 km
Date, time: 2025.01.23 06:56:29
Paramteric values:  02 8D 41 02 85 92 10 11 1F AC 10 12 04 54 10 2E 02
Status: Confirmed
----------------------------
01397 [0x000575] Archive (inactive)
C110BF0: Adaptive cruise control sensor, Restricted view
FAULT_SYSTEM_NO_FREE_SIGHT
Status bits: 1
Priority: 4
Frequency: 1
Unlearning index: 162
Odometer: 203268 km
Date, time: 2025.01.23 15:03:21
Paramteric values:  02 8D 39 02 85 55 10 11 00 00 10 12 00 00 10 2E 01
Status: Confirmed
----------------------------
02068 [0x000814] Archive (inactive)
U112300: Databus error value received
FAULT_TSK_IRREV_FAIL
Status bits: 1
Priority: 6
Frequency: 3
Unlearning index: 185
Odometer: 203981 km
Date, time: 2025.02.11 06:22:05
Paramteric values:  02 8D 40 02 85 93 10 11 0E 64 10 12 04 BD 10 2E 02
Status: Confirmed
============================
69. Trailer functions69. Trailer functions
DTCs: 2
----------------------------
136203 [0x02140B] Archive (inactive)
P175700: Voltage supply, Open circuit
Supply voltage - open circuit
Status: Confirmed
----------------------------
656394 [0x0A040A]
C10F515: Left trailer tail lamp bulb, Open circuit/short circuit to B
Left-hand tail light, trailer - open circuit/short circuit to B (RoW)
Status bits: 1
Priority: 3
Frequency: 1
Unlearning index: 141
Odometer: 195172 km
Date, time: 2024.09.14 09:37:26
Status: Test failed, Confirmed

 

Edited 11 February, 20251 yr by asser90

Hello there,

 

I suspect that you have either a boost pressure leak on the Turbo (incoming, check the manifold for leaks) or you have sticking Turbo vanes.  Check the turbo vane actuator and make sure it hasn't got stuck.

 

Other issues highlighted:

 

a) Remote Key 2 needs a new battery

b) You have a Left trailer tail lamp bulb that has failed.

 

All the other faults about Restricted performance and no cruise control is in relation to the Turbo problem.

From underboost code I wud expect a leak / crack in boost pipe or a vacuum leak.

 

What engine?

 

I believe sticking turbo vanes usually cause overboost.

19 hours ago, Skodaudi said:

I believe sticking turbo vanes usually cause overboost

Not always, not if the vanes are stuck in the shut position.