17965 - Charge Pressure Control: Positive Deviation

matt-doyle · Mar 16, 2007

Hi,

I'm getting this fault code on my car:
17965 - Charge Pressure Control: Positive Deviation
P1557 - 35-10 - - - Intermittent

Seat Leon 1.9 TDi 110 (ASV engine)

When I'm travelling uphill mainly when the engine is cold at about 2500 to 3000rpm to turbo just cuts out because it detects overboost. My car then goes into limp mode until I switch the ignition off and on again. I've read on the forum it could be the vanes on the turbo sticking but i've thrashed it a few times to exercise them and it still does it. Could it be the N75 valve which i've read about?

Any ideas?

Thanks

Matt

stoneyfordNI · Mar 16, 2007

what kind of car is it , engine type/power?

Oh i see it now

positive deviations are usually sticky vanes , theres an cheap n easy way to find out tho ,. get the revs nice and low in a high gear , accelerate full blast and just as the turbo seems to build boost , lift the throttle , let the revs die , then repeat the process , this moves the vanes from theyre no boost position to the full boost position and should free any crud ,. also try getting some diesel engine cleaner , the spray can stuff ( £10 or so ) this gets applied into the boost pipe right before the intake and helped the same prob on mine - well reduced it anyhows - 10K boost i think it was , loads of these produsts on the market .

prevention is better than cure tho , so once in a while - if this is the problem , once the engine is up to temp , rev it out a few times whilst driving to blow the cobwebs from it

hope you get it sorted

stephen

matt-doyle · Mar 16, 2007

thanks for the advice mate, I've tried revving the pants off it while driving but it still does it. I'm going to get a can of cleaner tomorrow and try that

stoneyfordNI · Mar 16, 2007

im sure someone will come along with vagcom locally ,

do you know where the n75 and n18 ( egr control )valves are -- they are actually the same part , switch them over and see if the car behaves normally ( faulty n75) or still overboosting ( please look harder )

worth a punt

matt-doyle · Mar 16, 2007

I don't know where they are. I've only had the car for a month so i'm new to VAG diesels. would you be able to tell me?
i've got vagcom, thats how i got the fault code.

stoneyfordNI · Mar 16, 2007

do you know where the EGR and turbo actuator are ?

if you do , follow the vacc. lines from them , they each terminate in a valve ( prob mounted on engine or bulkhead. these valves just need swapped - label up the hoses or something so you dont mix them up - V important

EGR valve looks like a brass mushroom capped thing on the intake to the engine

stoneyfordNI · Mar 16, 2007

EGR valve

http://cgi.ebay.com/ebaymotors/VW-E...558QQitemZ230102696776QQrdZ1QQsspagenameZWDVW

all you'll see is the top bit tho

cossie333 · Apr 3, 2007

ive got the same problem and its driving me nuts as i do 1000ish miles a week ive connected vag com and got the same problem, i also took it to a specialist and he recons that the boost pressure sensor may be faulty as he has had to change these on a couple of passats recently have you sorted it yet, if so what was the problem, mine happens when the car is warm then goes into safe mode but i can feel a hesitation around 2500-3000 rpm when cold sometimes, please help me.......

matt-doyle · Jul 8, 2007

I had this problem sorted out a few months ago now. It was the VNT vanes sticking in the turbo. Had the thing dismantled and sandblasted to get rid of the soot and now it runs perfectly.

Fallen Angel · Jul 9, 2007

I think i have the same problem, at the same rev's too, is it like a flat spot in 1st and sometimes in 2nd gear? I've had mine at Seat three times, no fault code comes up, they are unable to tell me for certain which valve/sensor could be going wrong.
I've like to try putting the N75J valve on mine to see if that helps but can't find the part code and neither Seat or VW know hat valve i'm talking about!

matt-doyle · Jul 9, 2007

No, mine was driving fine then all of a sudden the turbo would completely be cut off and the car was in limp mode. The turbo would be enabled again when the ignition was switched off and then back on. The code showed positive pressure deviation caused by the VNT vanes sticking inside the turbo. Nothing was wrong with the N75 valve.

Chris_Hardy · Jan 31, 2009

help on charge pressure problems

I wonder if anyone could help? As I have the similar problem to Matt Doyle above,,, having recently purchase a Seat Leon 1.9 tdi the 90 bhp. Basically the turbo cuts out at speed (normally motorway driving) but on A roads as well and seems to loose a lot of power and acceleration. Once the car is parked it seems fine the next time it is driven until the power drop again. Now I have a lack of confidence to over take or to change into the fast lane as I know as soon as I get to the 3000rpm mark the power could be pulled beneath my rug of a car!
With this problem I have seen a friend with a laptop and cable and have received the sad news of the following error code,
17965 - Charge Pressure Control: Positive Deviation p1557 - 35 - 10 intermittent.
Any help as I have looked at all the vacuum pipes and the sensor and they all seem to be connected. I even looked at the EGR butterfly valve as I wondered if this would cut the turbo off.
What are the VNT vanes sticking inside the turbo? Can I clean them myself?? If not which one of the sensors should I start with?

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