P0234 code

Mike C
Posts: 146
Joined: Fri Dec 10, 2021 7:13 am

Re: P0234 code

Post by Mike C »

Are your battery and body earths clean and tight?
wwilliamson
Posts: 2
Joined: Thu Oct 27, 2022 11:22 am

Re: P0234 code

Post by wwilliamson »

Hi, did you ever work out what was the cause of the Code P0234, with Engine check light and limp mode.
I have the exact same intermittent problem.
Any help would be appreciated.
mydmax
Posts: 2103
Joined: Sat Oct 12, 2013 8:36 pm

Re: P0234 code

Post by mydmax »

Williamson
A check revealed a code indicating overboost at some point or time. If driven quietly and oil from blowby has clogged up the director ring in the turbo exit it may stick sometimes and allow more boost to be developed than normal. A good loaded run may cure that, ie, get it hot to burn out the rubbish which may cause sticking. What oil quality do you use? A dealer may not fill with decent oil and cause more blowby fumes etc which is carbon in the burn in cylinders. It is possible the boost sensor is faulty or perhaps the wiring plug is loose and periodically not sending proper voltage reading to ECU.
The turbo has a vacuum operated boost control chamber. It !ay be sticking sometimes and not controlling the internal turbo vane ring properly.
wwilliamson
Posts: 2
Joined: Thu Oct 27, 2022 11:22 am

Re: P0234 code

Post by wwilliamson »

Thanks mydmax
Radicol
Posts: 1
Joined: Sun Jun 16, 2024 8:58 am

Re: P0234 code

Post by Radicol »

This is a blocked hose between air cleaner and 4 way valve with hose to turbo and intake.
I spent 1500 trying to find the reason for turbo overboost, 35 psi, then it would shut down.
It was a speer grass sead in the hose out of the air cleaner and it would suck down and blockthe hose. $3 hose replacement and problem solved.
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