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Home > General > P0234-77 Turbo Overboost - SDV6 L494 |
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PhilMid Member Since: 14 Aug 2015 Location: Hull, East Yorkshire Posts: 61 |
I kept getting the same code come up (with similar dpf issues), and in the end changed the throttle body and had a software update, which has solved the issue so far. |
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Sun Apr 24 2022 3:12pm |
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SAK335 Member Since: 02 Apr 2022 Location: Henley-on-Thames Posts: 22 |
Well, a few days after I wrote this, I got another check engine light. Same code, plus one for the MAP sensor. I replaced the MAP sensor and that's solved it for now. If I get another error, I'm going to swap out the oil separator, which seems to be a very common problem. Nobody seems to know why for sure. I keep plugging in my scan tool and seeing that the DPF hasn't regenerated in over 500 miles, with no warnings on the dash, with no other error codes present. It seems very odd that JLR have programmed this car this way. |
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Tue Apr 26 2022 8:34pm |
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SAK335 Member Since: 02 Apr 2022 Location: Henley-on-Thames Posts: 22 |
RTMOP:
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Thu Apr 28 2022 9:30pm |
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Disco_Mikey Member Since: 08 Apr 2012 Location: Dundee, Scotland Posts: 4390 |
These were guilty of throttle body issues...
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Thu Apr 28 2022 11:10pm |
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SAK335 Member Since: 02 Apr 2022 Location: Henley-on-Thames Posts: 22 |
I've tested that numerous times and it's functioning as intended. I readapted it twice and there are no issues. I can't tell you how many posts I've found where people replaced this part only to have the problem return days or weeks later.
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Fri Apr 29 2022 8:56am |
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Disco_Mikey Member Since: 08 Apr 2012 Location: Dundee, Scotland Posts: 4390 |
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Fri Apr 29 2022 12:07pm |
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SAK335 Member Since: 02 Apr 2022 Location: Henley-on-Thames Posts: 22 |
Yep, I've got the TSB, and as I said, mine checks out fine and doesn't need to be replaced. Have you had one of these in your hands? There is exactly one moving part on the intake throttle body, which is the throttle plate which is controlled by a solenoid. The failure mode is that the plate (which is made of a fibrous plastic material), swells up when bombarded constantly by the soot and oil from the turbo and EGR gases. Once the plate swells sufficiently, it sticks in place in the fully closed position which cuts off the supply of air to the engine, setting the check engine light. Replacing the part will just guarantee that you will replace it again once the new one swells up. That's because, despite the TSB and despite JLR knowing this is problematic, they have not issued an updated part, which they should have done and that part should have a metal throttle plate. It's a FoMoCo (aka Ford Motor Company) part, after all, since this is Ford engine. And had I known that before I bought this car, well, I wouldn't have bought it because as an American I'd rather push my Chevy than drive a Ford, for good reason.
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Sat Apr 30 2022 8:15am |
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SAK335 Member Since: 02 Apr 2022 Location: Henley-on-Thames Posts: 22 |
So, an update of sorts. I'm still getting "itemporary" P0234-77 errors, but now have P049C as the primary source of the MIL being illuminated. Ran a smoke test and found that it was leaking at the oil separator. Replaced that and it was still leaking in the same place. Replaced the seals between the block and the oil separator (they are cheap) and I can't find any more leaks. The smoke starts coming out the intake on the opposite side. When I plug the intake with a rag, no smoke anywhere so I assume no leaks.
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Fri Jul 01 2022 3:49pm |
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Claritas Member Since: 08 Jan 2023 Location: North Posts: 3 |
Having had the RRS for over a year now and suffered the similar problems to you, I want to try and resolve for good.
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Sun Jan 08 2023 12:39pm |
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SAK335 Member Since: 02 Apr 2022 Location: Henley-on-Thames Posts: 22 |
If I were you, then I would replace the throttle body itself.
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Sat Jan 14 2023 10:17am |
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Claritas Member Since: 08 Jan 2023 Location: North Posts: 3 |
I think I might have done the same as you and filed too much off the flap and probably need a new throttle body.
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Sat Jan 14 2023 11:11pm |
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SAK335 Member Since: 02 Apr 2022 Location: Henley-on-Thames Posts: 22 |
I bought one from Maltings Off Road. You need to send the old one back as a core, but they provide a postage-paid label. |
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Sun Jan 15 2023 3:15pm |
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Claritas Member Since: 08 Jan 2023 Location: North Posts: 3 |
Thanks man, I suppose you don't have a part number handy? |
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Sun Jan 15 2023 4:00pm |
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SAK335 Member Since: 02 Apr 2022 Location: Henley-on-Thames Posts: 22 |
LR078546 |
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Sun Jan 15 2023 4:46pm |
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