Tech Help Please? - D4D Error Code P1251 & Limp Home Mode

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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby shannon_parnell on Thu, 26 May 2011 6:55 +0000

I have a 2005 d4d lux, with exhaust & cat removed (smashed out) :) It does seem to rev a lot more freely from the bottom. No limp or engine lights, Im happy with my decision to de-restict it.. :)
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby Quikvl on Fri, 11 May 2012 5:03 +0000

Hey guys has anyone who had these problems fixed it.
Mine is starting to do it. Recently bought car and fitted 3" exhaust. But it did it with standard exhaust
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby eljotaferrari on Fri, 22 Jun 2012 8:34 +0000

Hi, I´m from uruguay, South Ameria and I have the same problem, I had clean my turbo twice and the problem persist, I don´t want to buy a new turbo
!!
Help Please

Thanksss
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby highoctane on Sun, 02 Dec 2012 9:28 +0000

Has this problem been sorted out yet?
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby greg bordin on Thu, 12 Jun 2014 7:45 +0000

Has problem been sorted yet I have hilux 2005 and mine has done this just once greg
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby TuffluxOffroad on Thu, 12 Jun 2014 8:55 +0000

It's an over boost issue, the turbo psi will spike intermittently, it's a variation of A few things combined, such as age, temp and the initial design
You can change turbos, ecu's etc etc as we have and you" ll waste your time and cash
The below modification will sort it out of its the same issue P1251 which on the scanner comes up as intermittent steppermotor overboost


A Dawes valve and a psi gauge set up will release pressure and stop the ecu from going into limp mode
Contact Taipan Exhaust for the kit
Hope this helped, we spent 4 years trying to sort this out with every bloke and his dog saying it was this this and that,
Taipan were the only ones who were correct they know their stuff!
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby esme_13 on Mon, 14 Jul 2014 6:46 +0000

Has anyone tried the Dawes valve approach. I have a stock standard 2007 d4d and has started doing this with error code p1251. I have just started towing a small 800 kg van and it comes on when I go up the first hill only
As with limp mode turn it off for 30 seconds and away it goes
It's bloody annoying It's cost me a small amount of a couple of hundred dollars but who wants to spend heaps and replace turbos etc for no result. It would be nice to find the answer
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby JUSTAUTOS on Mon, 14 Jul 2014 7:09 +0000

Dawes vavle will not work with a 1kd as thr turbo is electrical controlled and not by vacum like other cars. U other need a chip with map control or clamp the voltage.
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby 80scruiser on Fri, 25 Jul 2014 7:46 +0000

Take it to an independent diesel tech and have the fuel delivery pressure valve replaced on the pump. About $300.
2010 SR5 D4D Auto ARB bar & suspension, Rear Elocker.
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby jaxmyboy on Sat, 25 Jun 2016 2:35 +0000

So did this get sorted in the end. My 2011 is playing up now..
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby Luxxy2005 on Mon, 25 Jul 2016 6:41 +0000

Same issue here..... Any definite answers yet???
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby Luxxy2005 on Wed, 12 Oct 2016 9:15 +0000

Any updates?
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby babajangas on Wed, 12 Oct 2016 1:35 +0000

Hey Luxxy had the same issues with over boosting all the time threw a code a couple of times I wound out the grub screw on the turbo a few turns and hasn't happened in 6 months. Check out my thread on over boosting should provide a few answers .are you running a boost gauge?
Cheers matt
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby Ergon on Wed, 12 Oct 2016 8:45 +0000

This happened with my 2005 Hilux 3.0 when I installed a blocking device for the EGR. I even made a 6-7mm hole in the middle as advice here but still going on limp mode... I'm running 3" straight pipe No Muffler No Cat. I then removed the EGR block and never had any problem since then...
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby obiee on Wed, 01 Mar 2017 3:41 +0000

Has anyone found a cure for the p1251 overboosting code
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby fourby4diesel on Wed, 01 Mar 2017 4:32 +0000

It can be caused by a number of things.

Turbocharger sub-assembly
Turbo motor driver
Turbo motor driver power source
Extremely low battery voltage (P0560 output simultaneously)
Manifold absolute pressure sensor
MAF meter
EGR valve assembly
Exhaust system and intake system are modified or clogged
Turbo motor driver (momentary power cut)
Battery voltage drop
ECM
New DENSO Injectors are the go! New genuine parts.
Cheers, Anth - Technician - 1KD-FTV

Check your injectors about every 10,000k.
WARNING check oil pickup screen is clear
no chips no tune ups - why increase risk of piston cracking?
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Tech Help Please? - D4D Error Code P1251 & Limp Home Mode

Postby CHUTCH on Wed, 02 May 2018 7:09 +0000

My hilux just started throwing the same code dtc p1251, funny enough it happened going up a slight hill when it went into limp mode.

I booked the car into cornell diesel and the have told me that the turbo stepper control circuit fault with the car showing engine MIL & stability control light.

They also told me that the intercooler is full of oil and the egr is full of carbon build up, they want to replace the turbo and give the intercooler & egr a clean.


Is this the normal procedure for this problem, im only asking as im looking at a $4-4500k bill.


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Last edited by CHUTCH on Wed, 02 May 2018 7:28 +0000, edited 1 time in total.
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby hiluxxury on Wed, 02 May 2018 7:27 +0000

Its unlikely your intercooler is full of carbon. Common for the intake downstream of the egr.

What mods have you done - chip/exhaust?
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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby CHUTCH on Wed, 02 May 2018 7:29 +0000

hiluxxury wrote:Its unlikely your intercooler is full of carbon. Common for the intake downstream of the egr.

What mods have you done - chip/exhaust?



Edited post mate, meant to write oil.



No chip. 3” exhaust. 160,000km on the clock.


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Re: Tech Help Please? - D4D Error Code P1251 & Limp Home Mod

Postby hiluxxury on Thu, 03 May 2018 3:43 +0000

Shop around for a better price on the egr clean. Have the code cleared and see if it happens again.

Oil is normal in the intercooler unless you fit a catch-can.
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