508 GT - P0299 Turbocharger pressure regulation fault

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scotcruz
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508 GT - P0299 Turbocharger pressure regulation fault

Post by scotcruz »

Hi folks,

I have a 2011 508 GT 2.2HDI and for the past few days not been feeling the GT factor, it feels if though the car is restricted. There are no warning lights and the car runs fine otherwise.

I have scanned the Engine ECU with Daigbox and found the P0299 Turbocharger pressure regulation fault.

Fault code details:
Atmospheric Pressure is 20995 mbar
Turbocharging Pressure is 2420 mbar
Turbocharger Pressure Setting is 30218 mbar
Accelerator Pedal Position is 132%
Airflow is 296 mg/impulse

I have cleaned both the Air Temperature and Air Pressure Sensors on the intake manifold (both were oily) but still no luck.

Please can someone give me pointers as to where to start from.

Thanks in Advance

Hell Razor5543
NOT Alistair or Simon
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Re: 508 GT - P0299 Turbocharger pressure regulation fault

Post by Hell Razor5543 »

Hi, and :welc: to the Forum,

Something that will help is if you post up the VIN here (which will, for security reasons, be obscured so only forum staff can read it). Then Forum staff can look up your vehicle, and then see exactly WHAT your vehicle had when she rolled out of the factory.

scotcruz
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Joined: 26 Sep 2020, 20:52
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Re: 508 GT - P0299 Turbocharger pressure regulation fault

Post by scotcruz »

Thanks James

Its VF3**************[VIN obfuscated, can be read by forum staff].

Appreciate your help

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GiveMeABreak
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Re: 508 GT - P0299 Turbocharger pressure regulation fault

Post by GiveMeABreak »

scotcruz wrote:
26 Sep 2020, 21:01
Hi folks,

I have a 2011 508 GT 2.2HDI and for the past few days not been feeling the GT factor, it feels if though the car is restricted. There are no warning lights and the car runs fine otherwise.

I have scanned the Engine ECU with Daigbox and found the P0299 Turbocharger pressure regulation fault.

Fault code details:
Atmospheric Pressure is 20995 mbar
Turbocharging Pressure is 2420 mbar
Turbocharger Pressure Setting is 30218 mbar
Accelerator Pedal Position is 132%
Airflow is 296 mg/impulse

I have cleaned both the Air Temperature and Air Pressure Sensors on the intake manifold (both were oily) but still no luck.

Please can someone give me pointers as to where to start from.

Thanks in Advance
Ok, so you have the DW12C engine with Bosch Injection ECU.
Fault Code: Fault P0299 the Charge pressure regulation: Air pressure below the reference value.

Description of Fault: It happens where there is a positive discrepancy of 300 to 600 mbar between the turbo pressure setting and the turbo pressure measured (for at least 5 seconds). It occurs during Turbocharger pressure regulation.

Conditions for Fault to clear: 3 decelerations passing through these conditions, without a recurrence

Downgrade Modes whilst Fault is active: When this code is active the Turbo is changed to "controlled turbo" mode. which is probably why it has lost some welly.

Also, there is deactivation of the vehicle cruise control, until the disappearance of the fault. It will reset when the fault disappears and you can use it again - until the fault reoccurs again though. Forced DPF regeneration is also prohibited via the diagnostic tool whilst he fault is active.

The Engine Management Light will also come on.

Symptoms: Noise
Smoke from the exhaust
Lack of power
Jerking/stalling
Starting problem
Fluid leak/smells (diesel fuel, oil, etc.)
Engine overheating with illumination of the engine coolant temperature indicator light
Diesel fuel consumption a bit higher
Unwanted acceleration

Suspect Areas: Turbocharging pressure sensor
Oil sump
Lubrication circuit of the turbocharger
Oil strainer
Air flow meter
Air cleaner
Engine oil
Air line between turbocharger and mixers
Air line between mixer and engine
Oil pump
Turbocharger air cooler
Turbocharger
Position indicator of the turbocharger
Exhaust gas recycling valve
Exhaust gas recirculation valve repeat
Electrical harness
Connector

scotcruz
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Joined: 26 Sep 2020, 20:52
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Re: 508 GT - P0299 Turbocharger pressure regulation fault

Post by scotcruz »

Thank you.. thats a long list but good starting point.

I have cleaned the MAF too.. so would need to check the live readings. Any idea where I can get the standard readings of the sensors involved for what does good look like?

Also, I have been looking at the diagrams on service box but cannot locate the turbocharging pressure sensor? Just need to start from the top of the list and go through process of elimination.

In the meantime, if anyone has got ideas so I can focus on the possible cause, it will be greatly appreciated.

scotcruz
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Joined: 26 Sep 2020, 20:52
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Re: 508 GT - P0299 Turbocharger pressure regulation fault

Post by scotcruz »

I have checked the turbo readings.

Turbocharging pressure reference value us 1043 mbar
Turbocharging pressure measured is 990 mbar
Atmospheric pressure is 1005 mbar

This was at Idle.. does that mean turbocharger boost valve is faulty?

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xantia_v6
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Re: 508 GT - P0299 Turbocharger pressure regulation fault

Post by xantia_v6 »

You can't tell much at idle, as the ECU is not requesting any significant boost. You need to put some load on the engine to get the reference value a bit higher.

scotcruz
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Re: 508 GT - P0299 Turbocharger pressure regulation fault

Post by scotcruz »

OK, so after cleaning the Turbocharger boost sensor and clearing the code at the weekend, I have driven the car and scanned twice and the fault hasn't appeared again? Although the car is still sluggish.. its not the limp mode as I am getting the revs but not the GT umph..

Any thought?

I will do a forced regeneration on my drive on Thursday (rain tomorrow) and revert

scotcruz
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Joined: 26 Sep 2020, 20:52
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Re: 508 GT - P0299 Turbocharger pressure regulation fault

Post by scotcruz »

So the regeneration takes place as it should. (I had to delete the P0299 code to let regeneration take place)

I have noticed that the P0299 only shows up when the car is driven over 2500 rpm (definitely at 3000rpm)

Any idea what vacuum pipes I need to check? I noticed that the hoses to the intercooler is a bit loose.. is this meant to be loose? The top ones which are not the typical screw on ones are also loose (looks like they are loose by design)

Please can someone help?