I have the GDE tune and just put in the weeks mod. My code reader says "turbo underboost" but the manual says "throttle position sensor" I have very little power after 30MPH. But it does accelerate, albiet, slowly.
I put in new Samco hoses and checked everything, no leaks.
So is it a problem in the TPS sensor circuit or is the tubo not boosting. I checked the vacuum and have 28 at the modulator.???

TPS sensor failure invokes 'limp-mode' - likely you bumped some wiring in the weeks elbow area - several sensors are on each +5v source - thus, a pinched wire can disable several sensors - recheck wiring in that area

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'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

Tks
But I pulled all the plugs on that side when I did the head gasket job and the weeks mob.
Is there a chance that there is something I did not reconnect on the intake side after the weeks mod?

Don't remember the code I had, but once I forgot to tie the clamp for the turbo hose. Could that be in your case?

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2005 kj CRD, samco, suncoast tc, provent, Kennedy lift pump, GDE ECO full torque, 2nd gen filter head, 245/70/16 a/t tires, mopar light bar, fumoto oil valve, OEM Skid Plates, ARB Front bumper and HD OME, tru cool LPD47391 40k GVW tranny cooler (stock cooler delete), FF Dynamics e-fan and shroud, rocker arms replaced, HDS2 190F thermostat.

_________________
'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

P0229 is a TPS malfunction. P0299 is turbo underboost. There is a conflict between your subject header and what you say your code reader is telling you the diagnosis is.

_________________
George Reiswig
2005 Jeep Liberty CRD
Suncoast, SEGR, lift, InMotion tune, homebrew B100
At 138k, new head & gasket, timing belt, rockers and swearing vocabulary

_________________
'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

I was in error, it was 299/turbo under boost. I was putting up Xmas decorations and geiswig put in the seed of doubt. So I drove 40 minutes RT to check the code reader and as another suggested, the hose clamps. I did not have the clamp on the weeks manifold square/ offset so it is probable that there is my boost leak. I thought it more politically correct to get back to the Xmas decorations. Without these forums for my two older tdi s and my two crd s I would be in trouble. I would just buy a new car and join the crowd.

Like the wife says, " 'Tis the season to DO AS YOU'RE BLOODY WELL TOLD!"

Glad you got it sorted. And yes, forums like this can be a huge help.

_________________
George Reiswig
2005 Jeep Liberty CRD
Suncoast, SEGR, lift, InMotion tune, homebrew B100
At 138k, new head & gasket, timing belt, rockers and swearing vocabulary