Fault codes help needed

[rourkemason]

Checking the OBDII had a list of error codes, few that stood out were:
P26F800 - Coolant pump C stuck
U042800 - Invalid data received from steering angle sensor module
U101100 - supply voltage too low
C10D700 - comfort restriction
B12ECF2 - LED module left for DRL and parking lamp Supply, open circuit/ short circuit to B+
I appreciate it’s a lot but any help would be great as i’m new to VAG

 

[RUM4MO]

The first and last one are probably indicating actual faults as described, the rest is probably due to a low battery state of charge - maybe due to battery dying with age or car not being used enough, or on short journeys only.

 

[rourkemason]

The first and last one are probably indicating actual faults as described, the rest is probably due to a low battery state of charge - maybe due to battery dying with age or car not being used enough, or on short journeys only.

Any idea as to what they mean? guessing coolant pump c stuck means a wire may be damaged or something? No clue for DRL code had a look and can’t find much else said for it

 

[rourkemason]

To add context, the car has had a newer engine fitted (same engine just less mileage) and unsure if codes were cleared since so i did clear them - the only two to come back as errors were LED footwell and fuel cover locking. Does this mean the codes previously appearing are not an issue?

 

[RUM4MO]

Well, do the DRLs and parking lights work as they should, that would be my first and logical check.

The coolant pump, I’m guessing has a solenoid operated sleeve that controls the rate of coolant flow. Other than using your scan tool to check for actual coolant temperatures that could indicate a pump issue.
Really using a scan tool without having any ability to fix cars can be a waste of time.
Just record and clear the faults and see if they come back.

 

[SuperV8]

To add context, the car has had a newer engine fitted (same engine just less mileage) and unsure if codes were cleared since so i did clear them - the only two to come back as errors were LED footwell and fuel cover locking. Does this mean the codes previously appearing are not an issue?

Yes, probably just temporary codes from the battery disconnect.

 

[nd-photo.nl]

@rourkemason protip, VAG error codes tend to be pretty well documented. Just search for the error code and add "vcds" to it.

For instance: P26F800 vcds

I think the first and last are real error messages, the rest probably a result of low battery state or disconnecting the battery. For P26F800:A quick search points to the AUX water pump(s). Which car + engine do you have?

 

[RUM4MO]

I’d certainly give the fuel flap fault code consideration as having that failed could spoil your day. Footwell LED hardly a worry though again, are they working?

 

[DaveS]

The fuel flap one is a common problem and is reasonably easy to replace yourself. Just make sure to get an original part and not a cheap copy. They can fail in the locked or unlocked position.

 

[rourkemason]

@rourkemason protip, VAG error codes tend to be pretty well documented. Just search for the error code and add "vcds" to it.

For instance: P26F800 vcds

I think the first and last are real error messages, the rest probably a result of low battery state or disconnecting the battery. For P26F800:A quick search points to the AUX water pump(s). Which car + engine do you have?

Good to know, i’m new to VAG and my dad just ran an obd reader to see if any faults came up. My model is Leon fr 184 Tdi 2016

 

[rourkemason]

Thanks everyone for the help, the fuel lock issue does get annoying but usually a few lock/ unlocks sorts it ?. I might get the coolant pump looked at as i hear gurgling in the dash on ignition start (even on the driest of days so i’m presuming its coolant). I did take that to my mechanic and he said it shouldn’t be anything to worry about but i’m not so sure.

 

[SRGTD]

Thanks everyone for the help, the fuel lock issue does get annoying but usually a few lock/ unlocks sorts it ?.

I‘m a great believer of ‘Sod’s Law’, and Sods Law says that the fuel filler flap actuator will fail with the filler flap in the locked position when you‘re miles from home with a nearly empty petrol tank and unable to open the flap to refuel. The warning signs are there of impending failure so I’d get it sorted sooner rather than later, rather than suffer the annoyance, frustration and expense of potentially being left stranded; forewarned is forearmed…….?

There are quite a few videos on YouTube showing how to replace the actuator.

 

[nd-photo.nl]

Same here, I'm all for preventative maintenance. Sometimes maybe even too much But that also generates content for my Youtube channel so yeahhhh ?‍

 

[tracktoy]

With regards to the fuel lock issue I have replaced mine its very easy but I would also suggest you change the coding so reduce the number of opening/closing events

Disable fuel cap lock while driving.


* Applicable up to MY16 *
With this mod, the fuel cap lock will not work when we are driving.
Originally it closes together with the doors when reaching 20 KM / H. It is an element that suffers a lot of wear and tear, so by doing this mod we will give it a little more useful life.
1 - Module 09 - Electronic control unit - Code (31347)
2 - Adaptation
3 - Access control
4 - Geschwindigkeitsabhaengige tankdeckelverriegelung - (Change value to not active)


* Applicable from MY17 *
1 - Module 09 - Electronic control unit - Code ( 31347)
2 - Adaptation
3 - ZV Autolock
4 - Geschwindigkeitsabhaengige tankdeckelverriegelung - (Change value to Inactive)

 

[nd-photo.nl]

@tracktoy Awesome, I will be doing this!

 

[BillyCool]

Thanks everyone for the help, the fuel lock issue does get annoying but usually a few lock/ unlocks sorts it ?. I might get the coolant pump looked at as i hear gurgling in the dash on ignition start (even on the driest of days so i’m presuming its coolant). I did take that to my mechanic and he said it shouldn’t be anything to worry about but i’m not so sure.

As others have said, if your fuel flap actuator fails in the locked position, it is a real PITA to sort. No manual release option (some people do retrofit one with a manual release from what I've read). Mine failed in the unlock position and the replacement has been sat in the shed for 3 years and may get fitted one day.

Do you know if the heater matrix has ever been replaced? The dashboard "gurgling" could also be a sign of that. The engine has 3 coolant circuits, so can be hard to fault find as the car won't always know exactly where the fault lies.

Ref the coolant pump, this video is helpful, particularly if you read the comments/replies.

 

[LeylandVCDS]

To add context, the car has had a newer engine fitted (same engine just less mileage) and unsure if codes were cleared since so i did clear them - the only two to come back as errors were LED footwell and fuel cover locking. Does this mean the codes previously appearing are not an issue?

The LED footwell light error will appear when the standard W5W bulbs are replaced with LED bulbs. The error can be coded out with diagnostics, simply by telling the ECU that LED bulbs are fitted. Here's the coding you need to sort that out:

Eliminate the error of the LED lamps on the footrest panels All models
If you are thinking about putting LEDs on the footrest soffits, with this modification you will avoid the VCDS footwell light error.
1 - Module 09 - Electronic control unit. Code (31347)
2 - Adaptation
3 - Leuchte30FR LC72
4 - Lasttyp 30 - (Change value to Led Kleinleistung - Default 2 * 5W)

 

[Danniw88]

Hi I'm new here. I have a code that has come up on mine quite similar P26F400 says its for coolant pump "C" control circuit/open. Mechanic seemed to think it was one of the water pumps (didn't know my car had 2 pumps if someone could educate me) Anyway he changed one yesterday and within 24 hours the light is back on the dash.

 

[Shahriyar Mustafa]

Hi I'm new here. I have a code that has come up on mine quite similar P26F400 says its for coolant pump "C" control circuit/open. Mechanic seemed to think it was one of the water pumps (didn't know my car had 2 pumps if someone could educate me) Anyway he changed one yesterday and within 24 hours the light is back on the dash.

Did you seem to sort it out? I’m in a similar situation right now too