T6 T32 180 limp mode

[Hannu]

I'm sorry to say that I'm very much old school and a VCDS novice.
I've just returned from a run were everything was fine and then after about 1/2hr returned to the vehicle to find the engine management light on. I connected VCDS to find the following warning:-
2 Faults Found:
9120 - EGR Sensor 1
P046C 00 [11101101] - Implausible Signal
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 4
Mileage: 216700 km
Date: 2102.14.31
Time: 18:05:32

Engine RPM: 0.00 /min
Normed load value: 0.0 %
Vehicle speed: 0 km/h
Coolant temperature: 68 C
Intake air temperature: 13 C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 13.080 V
Unlearning counter according OBD: 40
Air mass: actual value (mg/stroke): 0.0 mg/stroke
EGR Vacuum Regulator Solen.val.: activation: 100.00 %
EGR Solen.val.: actual value: 99.82 %
EGR valve: offset closed: -10.21 %
Actuator for high pressure EGR: status-Bits 0-7: 0
Actuator for high pressure EGR: status-Bits 0-7: 0
Actuator for high pressure EGR: status-Bits 0-7: 55
Actuator for high pressure EGR: status-Bits 0-7: 0
High press EGR actuator: actual unconditioned volt val: 1311.6 mV

11866 - Position Sensor for Turbo Inlet Valve
P22D5 00 [01100000] - Implausible Signal
Intermittent - Not Confirmed - Tested Since Memory Clear
Believing this was nothing major "implausible signal" I cleared the fault only to find the vehicle in limp mode.

I'm I right to clear the code to see if it returns and how do I get it out of limp ¯\_(ツ)_/¯

Many thanks

 

[Hannu]

I'm sorry to say that I'm very much old school and a VCDS novice.
I've just returned from a run were everything was fine and then after about 1/2hr returned to the vehicle to find the engine management light on. I connected VCDS to find the following warning:-
2 Faults Found:
9120 - EGR Sensor 1
P046C 00 [11101101] - Implausible Signal
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 4
Mileage: 216700 km
Date: 2102.14.31
Time: 18:05:32

Engine RPM: 0.00 /min
Normed load value: 0.0 %
Vehicle speed: 0 km/h
Coolant temperature: 68 C
Intake air temperature: 13 C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 13.080 V
Unlearning counter according OBD: 40
Air mass: actual value (mg/stroke): 0.0 mg/stroke
EGR Vacuum Regulator Solen.val.: activation: 100.00 %
EGR Solen.val.: actual value: 99.82 %
EGR valve: offset closed: -10.21 %
Actuator for high pressure EGR: status-Bits 0-7: 0
Actuator for high pressure EGR: status-Bits 0-7: 0
Actuator for high pressure EGR: status-Bits 0-7: 55
Actuator for high pressure EGR: status-Bits 0-7: 0
High press EGR actuator: actual unconditioned volt val: 1311.6 mV

11866 - Position Sensor for Turbo Inlet Valve
P22D5 00 [01100000] - Implausible Signal
Intermittent - Not Confirmed - Tested Since Memory Clear
Believing this was nothing major "implausible signal" I cleared the fault only to find the vehicle in limp mode.

I'm I right to clear the code to see if it returns and how do I get it out of limp ¯\_(ツ)_/¯

Many thanks

Forgot to mention its a CFCA engine

 

[mmi]

Please share

1) full VCDS Auto-Scan​

2) engine blockmap data - ignition ON, engine OFF​

3) engine blockmap data - engine running at idle​

---

How-to:

VCDS > Applications > Controller Channel Map >

For "Single controller address" - 01

Tick/fill boxes as above and click Go.

VCDS flashes screens for a moment (when finished hit "Done, Go Back") and there should be a file blockmap-01-... in folder C:\Ross-Tech\VCDS\Logs\....

Note: only VCDS HEX-V2 and VCDS HEX-NET cables have the capability to create blockmap files.

 

[Hannu]

Please share

1) full VCDS Auto-Scan​

2) engine blockmap data - ignition ON, engine OFF​

3) engine blockmap data - engine running at idle​

---

How-to:

VCDS > Applications > Controller Channel Map >

For "Single controller address" - 01

Tick/fill boxes as above and click Go.

VCDS flashes screens for a moment (when finished hit "Done, Go Back") and there should be a file blockmap-01-... in folder C:\Ross-Tech\VCDS\Logs\....

Note: only VCDS HEX-V2 and VCDS HEX-NET cables have the capability to create blockmap files.

Wednesday,18,December,2024,13:56:02:63135
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 24.7.1.0 (x64) HEX-V2 CB: 0.4643.4
Data version: 20240919 DS356.3
www.Ross-Tech.com

Many thanks for your assistance
I'll carry out the other check in the morning, I'm currently thinking I'll be needing a EGR value and cooler
Bryan

 

[Hannu]

Please share

1) full VCDS Auto-Scan​

2) engine blockmap data - ignition ON, engine OFF​

3) engine blockmap data - engine running at idle​

---

How-to:

VCDS > Applications > Controller Channel Map >

For "Single controller address" - 01

Tick/fill boxes as above and click Go.

VCDS flashes screens for a moment (when finished hit "Done, Go Back") and there should be a file blockmap-01-... in folder C:\Ross-Tech\VCDS\Logs\....

Note: only VCDS HEX-V2 and VCDS HEX-NET cables have the capability to create blockmap files.

Sincerely hope this makes more sense to you than it does to me

 

[mmi]

Thank you!
Could you please make also one but: ignition ON, engine not running.
Would help to understand how things are "at rest" as the fault P046C was triggered when engine was not running

P046C 00 [11101101] - Implausible Signal
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
....
Engine RPM: 0.00 /min

Meanwhile, have a look into VCDS if CFCA engine also have same diagnostics functions available as T6 EU6 engines - I believe it has as the diagnostics functions have been in ECUs "forever".

---

EDIT: it seems that in CFCA engine data has different labels.
Thus the following data items (measurement values) need to be "ticked" for CFCA engine's EGR testing:

• IDE00473 EGR Vacuum Regulator Solen.val.: activation
• IDE00581 EGR specified value
• IDE01259 EGR Solen.val.: actual value
• IDE01373 EGR valve: offset closed
• IDE01374 EGR valve: offset open
• IDE04257 High pressure EGR actuator: activation -9.23 %
• IDE04259 High press EGR actuator: actual unconditioned volt val

---

EGR Valve Self Test Procedure (IDE00242)- P046C?

So, I've been getting the all too common P046C fault code along with P2457 (Insufficient EGR Cooling Performance). Neither alone will flag a check engine light but combined they sometimes seem to. To try to figure out what is going on, I ran an EGR Flow test on VCDS using instruction from @mmi...

www.t6forum.com

[T6_measured] 01-Engine - Built-in test for EGR

So it seems - inevitable P0401. Well, visited a VW garage to be tested - the van had accumulated 30 events in ECU's memory since July 2021 (since 20 months now). Eventually managed turn on the emission light at event number 31 - thus had a priviledge to have EGR flow tested. The result -...

www.t6forum.com

I'm I right to clear the code to see if it returns and how do I get it out of limp ¯\_(ツ)_/¯

Yes, clearing the codes should take it out of limp mode.

 

[Hannu]

Thank you!
Could you please make also one but: ignition ON, engine not running.
Would help to understand how things are "at rest" as the fault P046C was triggered when engine was not running


Meanwhile, have a look into VCDS if CFCA engine also have same diagnostics functions available as T6 EU6 engines - I believe it has as the diagnostics functions have been in ECUs "forever".

---

EDIT: it seems that in CFCA engine data has different labels.
Thus the following data items (measurement values) need to be "ticked" for CFCA engine's EGR testing:

• IDE00473 EGR Vacuum Regulator Solen.val.: activation
• IDE00581 EGR specified value
• IDE01259 EGR Solen.val.: actual value
• IDE01373 EGR valve: offset closed
• IDE01374 EGR valve: offset open
• IDE04257 High pressure EGR actuator: activation -9.23 %
• IDE04259 High press EGR actuator: actual unconditioned volt val

---

EGR Valve Self Test Procedure (IDE00242)- P046C?

So, I've been getting the all too common P046C fault code along with P2457 (Insufficient EGR Cooling Performance). Neither alone will flag a check engine light but combined they sometimes seem to. To try to figure out what is going on, I ran an EGR Flow test on VCDS using instruction from @mmi...

www.t6forum.com

[T6_measured] 01-Engine - Built-in test for EGR

So it seems - inevitable P0401. Well, visited a VW garage to be tested - the van had accumulated 30 events in ECU's memory since July 2021 (since 20 months now). Eventually managed turn on the emission light at event number 31 - thus had a priviledge to have EGR flow tested. The result -...

www.t6forum.com

Yes, clearing the codes should take it out of limp mode.

Good morning, it didn't save the ignition on engine off data yesterday ¯\_(ツ)_/¯. I'm afraid I don't feel confident enough to do the further EGR test, always afraid of changing something I shouldn't and cocking things up.
Clearing the fault code HAS NOT taking it out of limp mode . Looking very much like I'll have to bite the bullet and change the EGR value and cooler
Many thanks for your help

 

[mmi]

Good morning, it didn't save the ignition on engine off data yesterday ¯\_(ツ)_/¯. I'm afraid I don't feel confident enough to do the further EGR test, always afraid of changing something I shouldn't and cocking things up.

Thanks for sharing the data - appreciated. Presumably sticking valve would only be noticed by doing a longer (than just one sample). recording. The procedure shouldn't change anything but never checked on CFCA engine - so indeed better safe than sorry.

Clearing the fault code HAS NOT taking it out of limp mode . Looking very much like I'll have to bite the bullet and change the EGR value and cooler

Interesting - possibly the implausible signal value was captured already when doing startup preparations.
New EGR + cooler sounds like a plan - obvioulsy sooner than later. Please update with new blockmaps with new parts.

 

[Hannu]

Thanks for sharing the data - appreciated. Presumably sticking valve would only be noticed by doing a longer (than just one sample). recording. The procedure shouldn't change anything but never checked on CFCA engine - so indeed better safe than sorry.


Interesting - possibly the implausible signal value was captured already when doing startup preparations.
New EGR + cooler sounds like a plan - obvioulsy sooner than later. Please update with new blockmaps with new parts.

Will do, parts on order