Help Needed! Multiple engine error codes.

[bakes]

Hi all,

Over the past week while driving on the highway my car has displayed the EPC error code and the check engine light flashed. The first time I made it back home, turned off the car and everything cleared. 5 days later it happened again on the highway and now the check engine light is constant on the dash.

Here are the Vagcomm codes:


5 Faults Found:
17875 - Exhaust Pressure Control Valve
P0475 00 [040] - Electrical Malfunction
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 93
Mileage: 170086 km
Date: 2023.04.24
Time: 18:40:47

Engine RPM: 1956.50 /min
Normed load value: 32.5 %
Vehicle speed: 114 km/h
Coolant temperature: 96 °C
Intake air temperature: 28 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 14.088 V
Unlearning counter according OBD: 17
Engine status: COENG_RUNNING
Engine status-Test_Program_Co Eng st COMPU VERB UBYTE: 3

10203 - Random/Multiple Cylinder Misfire Detected
P0300 00 [172] - -
MIL ON - Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 2
Mileage: 174531 km
Date: 2023.06.13
Time: 22:35:05

Engine RPM: 1917.50 /min
Normed load value: 20.8 %
Vehicle speed: 111 km/h
Coolant temperature: 96 °C
Intake air temperature: 38 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 13.923 V
Unlearning counter according OBD: 40
Engine status: COENG_RUNNING
Engine status-Test_Program_Co Eng st COMPU VERB UBYTE: 3

10598 - Cylinder 8
P0308 00 [172] - Misfire Detected
MIL ON - Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 2
Mileage: 174531 km
Date: 2023.06.13
Time: 22:35:05

Engine RPM: 1917.50 /min
Normed load value: 20.8 %
Vehicle speed: 111 km/h
Coolant temperature: 96 °C
Intake air temperature: 38 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 13.923 V
Unlearning counter according OBD: 40
Engine status: COENG_RUNNING
Engine status-Test_Program_Co Eng st COMPU VERB UBYTE: 3

10596 - Cylinder 6
P0306 00 [032] - Misfire Detected
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 174532 km
Date: 2023.06.13
Time: 22:35:18

Engine RPM: 1904.00 /min
Normed load value: 23.1 %
Vehicle speed: 110 km/h
Coolant temperature: 97 °C
Intake air temperature: 33 °C
Ambient air pressure: 990 mbar
Voltage terminal 30: 13.900 V
Unlearning counter according OBD: 25
Engine status: COENG_RUNNING
Engine status-Test_Program_Co Eng st COMPU VERB UBYTE: 3

10205 - Cylinder Disabling
P130A 00 [032] - -
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 3
Mileage: 174532 km
Date: 2023.06.13
Time: 22:35:19

Engine RPM: 2064.50 /min
Normed load value: 21.2 %
Vehicle speed: 16 km/h
Coolant temperature: 100 °C
Intake air temperature: 37 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 13.711 V
Unlearning counter according OBD: 40
Engine status: COENG_RUNNING
Engine status-Test_Program_Co Eng st COMPU VERB UBYTE: 3

Any thoughts or suggestions would be welcome. My local indie shop wants to replace the coils on cylinders 6 and 8 given the errors.

Should I think about going into Vagcomm and deactivating the engine from going into 4 cylinder mode while cruising as I do see a big puff of smoke out of the exhaust when that cycle ends and all cylinders are activated.

Any feedback would be greatly appreciated!

[Alabama]

Should I think about going into Vagcomm and deactivating the engine from going into 4 cylinder mode while cruising as I do see a big puff of smoke out of the exhaust when that cycle ends and all cylinders are activated.

Wait for the experts, but this does not seem like cylinder-on-demand is the culprit. My car does not make any puff of smoke when C.O.D. cycles on or off. Many AZ members choose to disable C.O.D. in the hope the life of the motor mounts will be extended, not because they get tailpipe smoke. My memory is that the chief engineer for Dyno Spectrum wrote that he maintains C.O.D. on his personal car, so I suspect it's personal preference.

[Burkeomatic]

You could go old school, and swap the misfiring coils to other cylinders and clear the codes.

If the code moves, to say, cylinders 3 and 5, it is your coils. If it doesn't, well you have ruled out coils.

Free diagnosis > shotgunning parts.

[paul-g]

You could go old school, and swap the misfiring coils to other cylinders and clear the codes.

If the code moves, to say, cylinders 3 and 5, it is your coils. If it doesn't, well you have ruled out coils.

Free diagnosis > shotgunning parts.

agree with this, my old f150 had same kinda thing going on and that's what i did found out it moved and 2 new coils went in

[Valpo A7]

Could this be another incident of a failing battery?

Multiple misfires on different cylinders. As suggested swap the coils and see if the code follows. Might be time for new spark plugs as well. Could even be a loose wire connection to the coil pack. Cylinder disabling happens when multiple misfires get detected. They attempt to shut down that cylinder so it does not dump fuel into it to cause fuel to travel into the exhaust and cause cat damage.

[Audisthesia]

Could this be another incident of a failing battery?

Multiple misfires on different cylinders. As suggested swap the coils and see if the code follows. Might be time for new spark plugs as well. Could even be a loose wire connection to the coil pack. Cylinder disabling happens when multiple misfires get detected. They attempt to shut down that cylinder so it does not dump fuel into it to cause fuel to travel into the exhaust and cause cat damage.

No. Misfires are not battery related, neither is the exhaust code. These are actual errors directly corresponding to the engine and exhaust.

[Valpo A7]

Well if you google CAN A BAD BATTERY CAUSE MISFIRE CODES there is a crapton of information saying yes it can.

The OP says he is getting the EPC light and codes but does not state that he actually feels the misfires. His sig says he has a 2013 and if the battery was original I would say he likely needs a new battery. I have read on here multiple times that when you get a bunch of codes to clear them and see what returns. If they clear and don't come back fairly soon then it points to a battery on its last leg.

Now if the OP does in fact feel the misfires then check the plugs, swap coils, check wiring, etc . . . to see what is going on including checking on the age of the battery.

Weak power systems cause all sorts of problems with these cars.

[Audisthesia]

Well if you google CAN A BAD BATTERY CAUSE MISFIRE CODES there is a crapton of information saying yes it can.

The OP says he is getting the EPC light and codes but does not state that he actually feels the misfires. His sig says he has a 2013 and if the battery was original I would say he likely needs a new battery. I have read on here multiple times that when you get a bunch of codes to clear them and see what returns. If they clear and don't come back fairly soon then it points to a battery on its last leg.

Now if the OP does in fact feel the misfires then check the plugs, swap coils, check wiring, etc . . . to see what is going on including checking on the age of the battery.

Weak power systems cause all sorts of problems with these cars.

I can Google all sorts of information, doesn't make it true. I have looked at enough scans on this platform to say with certainty that the OP scan is NOT a battery issue. If it were, we would see other errors that are a telltale sign.

[Alabama]

You could go old school, and swap the misfiring coils to other cylinders and clear the codes.

As was said in the movie "The Incredibles", there's no school like the old school.

[Burkeomatic]

As was said in the movie "The Incredibles", there's no school like the old school.

Hey man, some things never go out of style. Air, Fuel, Spark, Compression are still needed no matter how high tech the engine is, and if one of those is missing, you get misfires.

[bakes]

Hi all,

Quick update. I could definitely feel the misfires when they were happening. The car ran very rough and had a big loss in power. My indie shop recommended swapping the coils but then also commented that if they did swap over the coils to different cylinders and the errors followed the bad coils then they'd have to go in again to replace them. I had them replace the two coils on 6 & 8 and all seems good again. Hopefully that resolves things but it was random so time will tell. I had the spark plugs replaced in January when I had the car in for the oil screen recall work.

I appreciate the feedback and suggestions!

[Alabama]

Cylinder disabling happens when multiple misfires get detected. They attempt to shut down that cylinder so it does not dump fuel into it to cause fuel to travel into the exhaust and cause cat damage.

That's pretty clever. Cylinder on Demand (C.O.D.) also shuts down cylinders, for a different purpose. Question: if someone disables C.O.D., do they lose the ability to also shut down one cylinder that is misfiring?

[Valpo A7]

I have no idea about the COD. I just know that when my A7 threw some misfires that the cylinder disabling kicked in as well. I did not get a coil wire put back on correctly and it was fine in the garage but as soon as I hit the street for a test drive it gave me misfires under load.