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Grundey2



Member Since: 03 Jan 2023
Location: Lincolnshire
Posts: 31

United Kingdom 2010 Range Rover Vogue SE TDV8 Santorini Black
P0046-77 (2F)

Afternoon all,

Hoping someone with more technical know how then me can help with the error code I have.

GAP IID gives me: P0046-77 (2F) Turbo/supercharger boost control solenoid - circuit range / performance - mechanical failure - commanded position is not reachable

The car intermittently drops into Restricted Performance with the red triangle.

I tried to check the live data on “commanded boost actuator control - Bank 1” and the same for bank 2. Bank 1 is 0% and if you boot the car hard it jumps to 100%, no variation between where as bank 2 is fluctuating depending on how hard the engine is working. This may be nothing to do with the fault, I was taking a pun at which live data may be useful. I’m assuming it’s a stuck/faulty actuator?

Any advice on where to go next, where to locate any potential faulty items, and what to try next would be great.

Many Thanks, J

Post #659325 14th Mar 2023 4:20pm
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garyRR



Member Since: 13 Mar 2021
Location: Hampshire
Posts: 1464

United Kingdom 

Faults shown are normally a symptom and not the cause.

I'm assuming it's a 3.6?

If it's a 4.4 TDV8, the turbos are different. One is fixed and one is variable. One works 1,300+ and is variable, the other doesn't kick in until 2,200+, so they will perform differently. 2015 Range Rover Autobiography 4.4 SDV8

Post #659331 14th Mar 2023 5:41pm
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Grundey2



Member Since: 03 Jan 2023
Location: Lincolnshire
Posts: 31

United Kingdom 2010 Range Rover Vogue SE TDV8 Santorini Black

It a 4.4 TDV8.

I also had the donut off at the weekend, cleaned everything up and replaced the 4 intake rubber hoses, and cleaned the MAP and MAF sensors

Post #659335 14th Mar 2023 5:56pm
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garyRR



Member Since: 13 Mar 2021
Location: Hampshire
Posts: 1464

United Kingdom 

Any loss or irregular boost from either turbo? When does it go into restricted performance? E.g heavy acceleration?

Next thing I'd look at is the plastic union between the throttle body and the intercooler hose. If it's loose or there's sign of soot in the vicinity, temporary fix it to see if it solves the issue (just wrap gas spec PTFE or silicone tape around the throttle body and refit tight).

It's very rate for a 4.4 TDV8 to experience any form of turbo issue. 2015 Range Rover Autobiography 4.4 SDV8

Post #659338 14th Mar 2023 6:13pm
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Grundey2



Member Since: 03 Jan 2023
Location: Lincolnshire
Posts: 31

United Kingdom 2010 Range Rover Vogue SE TDV8 Santorini Black

It’s really intermittent. I took it for a run to try and diagnose it. I drove it steady, booted it, engine braked and it wouldn’t fault, then steady cruising at 55mph on the dual carriageway and it faulted.

I think there is more lag than there used to be, it seems a bit slow to respond when you accelerate.

I had the throttle body apart and cleaned it all up, and checked the large intake hose that attaches to the throttle body and that all seemed ok.

I’m pretty baffled. How you drive it, engine temperature no consistency in the error.

I assumed it was a sensor to begin with as I think it faults when the ECU does its status checks

Post #659342 14th Mar 2023 6:35pm
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Phoenix



Member Since: 16 May 2022
Location: Gone
Posts: 1631

United Kingdom 

The symptoms are similar to a small split in one of the charge air hoses or a leaking union, are you able to get it smoke tested? - not the usual low pressure smoke test, needs to be around 1.5bar.

Post #659345 14th Mar 2023 6:48pm
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Grundey2



Member Since: 03 Jan 2023
Location: Lincolnshire
Posts: 31

United Kingdom 2010 Range Rover Vogue SE TDV8 Santorini Black

I’ll ring round and see if there is somewhere that can smoke test it.

Which pipes are the Charge hoses?

Post #659370 14th Mar 2023 8:29pm
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garyRR



Member Since: 13 Mar 2021
Location: Hampshire
Posts: 1464

United Kingdom 

The two big hoses at the front of the engine bay.

Sometimes you need to remove them and give them a good squeeze and inspection to find a split.

I once found one where the split was only visible when squeezing it in the hand. 2015 Range Rover Autobiography 4.4 SDV8

Post #659374 14th Mar 2023 8:34pm
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Phoenix



Member Since: 16 May 2022
Location: Gone
Posts: 1631

United Kingdom 

Charge air hoses are anything after the turbos, air intake hoses are anything before them.

Post #659375 14th Mar 2023 8:34pm
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Grundey2



Member Since: 03 Jan 2023
Location: Lincolnshire
Posts: 31

United Kingdom 2010 Range Rover Vogue SE TDV8 Santorini Black

Ok, thanks for all the advice, I’ll strip some more hoses off and inspect them.

I’ll make some calls about smoke testing tomorrow too

Post #659379 14th Mar 2023 8:47pm
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24valve



Member Since: 07 Apr 2009
Location: Cornwall
Posts: 162

United Kingdom 2010 Range Rover Autobiography Black TDV8 Santorini Black

Bookmarked this as it is suspiciously similar to the problems my 4.4tdv8 has.

I've booked mine in for a inlet smoke test on Friday in the hope to find something split. 2010 L322 Autobiography Black Edition
1975 Land Rover

Post #659384 14th Mar 2023 9:19pm
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Grundey2



Member Since: 03 Jan 2023
Location: Lincolnshire
Posts: 31

United Kingdom 2010 Range Rover Vogue SE TDV8 Santorini Black

Keep us posted on how you get on with the smoke test, I’d be interested to know what they find

Post #659385 14th Mar 2023 9:34pm
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kevinp



Member Since: 28 Sep 2019
Location: Telford
Posts: 1205

United Kingdom 2011 Range Rover Autobiography TDV8 Santorini Black

Have you checked if the CSOV for the second turbo moves freely. There is an upgraded part.

Post #659389 14th Mar 2023 10:16pm
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Grundey2



Member Since: 03 Jan 2023
Location: Lincolnshire
Posts: 31

United Kingdom 2010 Range Rover Vogue SE TDV8 Santorini Black

Which is the second turbo, and what is the CSOV? Is it the actuator at the bottom on the near side of the engine bolted through the radiator housing? If so Yes. I had it off and cleaned it up etc when I swapped the alternator, belt and tensioner a couple of weeks ago.

Post #659392 14th Mar 2023 10:29pm
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kevinp



Member Since: 28 Sep 2019
Location: Telford
Posts: 1205

United Kingdom 2011 Range Rover Autobiography TDV8 Santorini Black

Sounds like you found it. Charge air shut off valve.
If yours has a nut on the actuator rod then it is original. Modified part is LR033284 but if it moves freely then I don't think it would help your problem.

Post #659394 14th Mar 2023 10:43pm
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