Hi all,

 

Last week while powering up a fairly steep hill in 3rd gear I experienced a sharp loss in power and the engine management light illuminated... Instant thought, car in limp mode...

 

I pulled over at the 1st opportunity and switched off the engine, on restarting apart from the engine management light everything seemed to return to normal. However, as I continued to drive the car I realised it wasn't as smooth at low revs and now had a pronounced shudder at engine shut-off. 

 

I have since read the codes using the VAG option on a T55 Fault Code reader recommended elsewhere in these forums.

 

This produced code 12547

 

reading the codes using the OBD2 option using the same tool gives code P2108

 

both codes return after resetting

 

The only other symptom (found after reading the forums) was F24 (10A) is blown, I haven't tried replacing it yet to see what happens.

 

So which part is faulty, I can't find much on 12547 on Google, most posts seem to point to 1.9 tdi Audi's, but are suggesting the throttle body needs replacing, searching for this part on the forum recommends changing rather than cleaning as they don't survive cleaning for long. However, doing the same on P2108 suggests that the EGR valve needs cleaning/replacing...

 

The car is September 2009, with BKD engine has currently 57,000 miles, the car has been serviced by main dealer and local VAG specialist and came into my ownership at 3 1/2 years old with only 18,000 miles recorded. I've added the rest of the mileage since. Car normally drives very well and despite being used around town with the occasional long run returns 47-47MPG with 55+MPG on a run... (based upon calculations as to what has gone into the tank and mileage covered, not the fuel computer)

 

I would appreciate comments before I go spending big wads of money with "experts" to swap parts until the problem goes away.

 

Regards,

 

Brian

 

Really need a proper vcds scan to identify the codes but the fuse blowing sounds like the throttle body flap isn't opening/closing, which will bring on eml on.

Limp mode could be clogged up turbo vanes, you could try adding archoil turbo cleaner to the fuel to see if that helps.

Bad form replying to my own post...

 

Thank you Briscodian for your reply so far, just to be 100% clear, limp mode only lasted until I stopped and restarted the car, a minute or so after the light came on.

 

But, now changed F24, cleared code...

 

Car now drivers as before light came on with no MIL

 

Hasn't returned (yet!)

 

Will see how it gets on this week, good run coming up on Thursday...

 

Regards,

 

Brian

Neither of those codes come up on Ross Tech wiki but there are a few close by that relate to the throttle valve. When these seize they blow the cooling fan fuse and put on the EML.

I'd disconnect the intake turbo hose and check the flap.

 

 

 

Sorry trying to get rid of the quote box, posted again... 

 

Regards,

 

Brian

Edited 22 July, 20169 yr by Yorkshire_Brian

I thought a postscript to this post may be useful to someone searching in the future...

 

Thanks for the replies...

 

All investigation pointed to throttle body, which for the uninitiated is the valve at the end of the intake hose just before the EGR valve, professional advice was to replace with either a new dealer part or the "branded" version from eurocarparts.co.uk, dealer wanted £350 (including discount!) eurocarparts got £204 for a part identical to the faulty part I took off (all numbers apart from date code identical), changed F24, reset MIL...

 

The butterfly in the faulty valve while not seized was quite stiff to open and close, the new one was much easier to operate with fingers.

 

500 miles later car is running as well, if not better than when I bought it...

 

No shudder on switch off, seems to drive much better at lower revs, I don't know exactly what the valve does and when it does it, but it doesn't just operate when you turn the engine off.

 

Regards,

 

Brian

Quote

 

All investigation pointed to throttle body, which for the uninitiated is the valve at the end of the intake hose just before the EGR valve, professional advice was to replace with

...

I don't know exactly what the valve does and when it does it, but it doesn't just operate when you turn the engine off.

 

As far as I know, no diesel engine has a "throttle body" but some recent TDI engines have something called "swirl flap" which, if I've understood correctly, is supposed to introduce additional turbulence to air before it enters the engine. The point of this additional turbulence is to improve burn process of fuel with light load (and improve economy as a side-effect). The flap is supposed to be near closed while idling or with very light load, and fully open whenever you hit the go-faster pedal.

 

As far as I know, this flap is way too often attached to plastic holders which end up wearing out sooner or later and that results in too much play for the flap axis, which causes the mechanism to hang or break down.

 

In the end, the idea behind this part is good but the actual implementation is of inferior quality (plastic pieces where metal should have been used).

P2108 is Throttle Actuator Control Mod Performance from the list I have...   although I'm not sure quite what that means...???

 

But this may help

 

https://www.obd-codes.com/p2108

Edited 11 July, 20187 yr by skomaz

39 minutes ago, skomaz said:

But this may help

https://www.obd-codes.com/p2108

 

That seems to document that code for gasoline engines. Note that this thread is about a TDI engine which burns diesel fuel.

15 minutes ago, mtrantalainen said:

 

That seems to document that code for gasoline engines. Note that this thread is about a TDI engine which burns diesel fuel.

 

Indeed I AM fully aware of that...   having owned diesel Skoda's for over 18 years and having been a member of this site all that time and VW Vortex before then...!!

 

In the spirit of helping I've posted a link which gives some additional ideas with regard to the fact that it could be something as simple as a connection etc., or an accelerator position sensor...

 

Jeez...

 

Either way it sounds like it's probably the intake manifold flap that's jamming / jammed as suggested earlier...   that is also generally known as a throttle body, regardless of engine type.

Edited 11 July, 20187 yr by skomaz