P2108 Error Code - Dirty Throttle Body Adapter?

**nb99** · 19-08-2020,04:37 PM

Hi All

Quick summary of the problem - I've just had an engine light error which is giving me an error code P2108 "Throttle Actuator Control Module Performance". I first had it 2 weeks ago, cleared it and it came back yesterday. I've been doing a lot of city driving recently (Stop/Start, low speeds) - don't know if relevant or not. To give a bit of history, 12 months ago I had the Throttle Body replaced as it malfunctioned. Been perfect since. I'm now wondering if a dirty Throttle Body Adapter could cause the new error, however I am far from a car expert and could be completely wrong.

My questions are:
Is it likely to be that? If not, what is more likely?
If it is the TBA, is it complicated removing and cleaning?
Is this serious/urgent? We leave on holidays in 2 days (700km each way in a week, mostly motorways) so would like to know if this needs to be sorted before we go or if it's something that will be OK for that distance/time.

It's a late 2005 3.0 TDI with about 100,000 miles. No noticeable performance issues. Changed all the injectors 18 months ago.

Thanks very much for any input.

NB

**Crasher** · 20-08-2020,03:34 PM

Do you know any details of what was replaced? The code P2108 doesn't sound right to me, more a generic code a cheap code reader throws out to confuse people. I would start with a VAG specific code read using VCDS.

**nb99** · 20-08-2020,03:46 PM

Originally Posted by Crasher

Do you know any details of what was replaced? The code P2108 doesn't sound right to me, more a generic code a cheap code reader throws out to confuse people. I would start with a VAG specific code read using VCDS.

The throttle body was replaced last summer.

Yes it is just a cheap code reader but when I have to pay €150 for the garage to plug it in each time I'd ideally like to avoid going down that route.

**Crasher** · 20-08-2020,04:33 PM

Unless you get a proper code read done you could replace the wrong part, it could be the manifold flaps.

**nb99** · 20-08-2020,04:39 PM

Originally Posted by Crasher

Unless you get a proper code read done you could replace the wrong part, it could be the manifold flaps.

OK but if I do try to clean out the Throttle Body Adapter, is that a big job and what is my downside? If it fixes it, great, if not no harm done?

**Crasher** · 20-08-2020,04:56 PM

It is on the cars left of the engine with a flexible hose coming from the left intercooler and is mounted to an adapter which bolts to the inlet manifold distribution pipe. A gentle wipe inside with solvent is OK BUT make sure no solvent gets into the manifold, it is much safer to remove the motor.

**swalker** · 21-08-2020,08:30 AM

Crasher is right cant beat VCDS, however it is expensive to keep in the glove box (metaphorically speaking ) just in case.
However OBD eleven is licensed by VAG and is worth its money (about the same as a scan by a garage) when it comes to debugging at this level.
It does have its pitfalls if you try and use it like VCDS, but i believe its a good tool for the one car, have a go owner.

**Crasher** · 21-08-2020,09:01 AM

I did have a quick play with OBD11 on a customers car but didn't have time to dig deeper.

**nb99** · 21-08-2020,09:09 AM

Originally Posted by Crasher

it is much safer to remove the motor.

Sorry - don't understand this bit.

I saw a guy on this forum took his TBA right off and cleaned it properly - it just didn't go into detail as to how to do this and how tricky (or not) it was. His was filthy - almost completely blocked up. I wonder if mine has a similar problem.

By the way, thanks for your time on this.