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Home > Technical (L322) > P004B and P004C 2012 4.4tdv8

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Joff1961

Member Since: 24 Dec 2023
Location: Wroughton
Posts: 18

P004B and P004C 2012 4.4tdv8

I have had the above codes for a bit now and have been trying to fix the problem. I then lost power and went into get you home mode, my Hawkeye is telling me it’s the boost control solenoid on turbo B. The thing is on the last drive when it went into limp mode I got home to find I have oil in the left side air filter ( uk car)

Click image to enlarge

I have today taken the compressor shut off valve off the car and have oil in it and pipe work to it on both sides

Click image to enlarge

Is this a sine the turbo B is now done or what could make this happen.

Any help would be fantastic. Also can I check the solenoid valve by putting 12v across the two terminals.

21st Jul 2025 5:23pm

Joff1961

Member Since: 24 Dec 2023
Location: Wroughton
Posts: 18

So after a few hours of looking and checking looks like I have found the problem

Click image to enlarge

3 vacuum lines not connected and I’ve also add some gas PTFE tape to help help seal around plastic part that goes onto throttle body as it was loose and £230 for a new seal is just mad, codes are gone and no RP at 2500rpm.

31st Jul 2025 9:03am

stan
Site Moderator

Member Since: 13 Jul 2010
Location: a moderate moderated moderator moderating moderately in moderation
Posts: 35801

good job ... - .- -.

Y. O. L. O.
.

31st Jul 2025 9:12am

TDV8_Tommy

Member Since: 20 Feb 2019
Location: Pinoso, Valencia
Posts: 434

2012 Range Rover Westminster TDV8 Baltic Blue

Yep, had the same problem.

Cheap and easyish fix.

Well done! 2012 4.4 TDV8 Westminster - Baltic Blue, Jet interior
1997 P38 2.5 DSE auto & 1998 P38 2.5 DT Manual
1988 Vogue 3.5 EFI - Manual, gone.
2004 Volvo C70 2.0T convertible, had since new.
2007 Mazda MX-5 2.0 Sport Roadster/Coupé, had since new.
2024 Mini Cooper S cabrio, JCW kit, 2.0, DCT auto

31st Jul 2025 10:10am

Eastsoutheast

Member Since: 10 Jan 2023
Location: Wimblington
Posts: 199

2012 Range Rover Vogue TDV8 Santorini Black

Could you help my do the same. How did you gain access to the cross over valve? Where abouts are those vacuum lines, the oily ones and the single one that had popped off?

Thanks 2012 4.4 TDV8 Vogue Santorini black ivory leather

31st Jul 2025 11:44am

Joff1961

Member Since: 24 Dec 2023
Location: Wroughton
Posts: 18

The vacuum lines are on the right hand side if your looking from the front with bonnet up. If you look at the fan cover on that side and look down about 150mm, take the air filter box out and the first part of the hose and you can just get your hand to them. As for the value I took off the front tray under the bumper and it’s just off centre on nearside (uk car)

Click image to enlarge

31st Jul 2025 3:36pm

Eastsoutheast

Member Since: 10 Jan 2023
Location: Wimblington
Posts: 199

Thanks 2012 4.4 TDV8 Vogue Santorini black ivory leather

1st Aug 2025 12:27am

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