Thread: Gear box fault warning

Originally Posted by Eric SDV6SE

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A quick Google tells me that P0088 is high fuel pressure too high, and relayed to the fuel rail pressure sensor voltage. A failing high pressure fuel pump leads to a drop in fuel delivery pressure (as seen by the sensor) as more is bypassed through the pump and back to tank.

No, a failing high pressure pump leads to an incorrect pressure. The PCV generally sticks and it can stick closed leading to low pressure or it can stick open leading to high pressure. The VCV sticking can only lead to low pressure as if it sticks open the only result is excessive fuel return temperatures and no impact on pressure.

Edit : The PCV description is ass about. It's closed for high pressure and open for low pressure.

Thanks for the clarification Brad, thought you'd be along.

I don't know too much about the hpfp system and PCV, was just going off the DTC description.

Update on the gearbox fault issues. So after getting the use of the scan tool and getting the code I decided after discussion with Richard the scan man as a first and cheapest step to replace the fuel filter which I reckon I hadn’t done in over a year, anyhow replaced it and so far no fault warning ⚠️ 😅 so fingers crossed.
Thanks again for the feedback.

Originally Posted by Bru

Update on the gearbox fault issues. So after getting the use of the scan tool and getting the code I decided after discussion with Richard the scan man as a first and cheapest step to replace the fuel filter which I reckon I hadn’t done in over a year, anyhow replaced it and so far no fault warning so fingers crossed.
Thanks again for the feedback.

“Tell him he’s dreamin’ “

It’ll be back.

Yes - it’s a long shot but worth a try.

Here’s a good sequence of same fault and diagnosis leading to HPFP DIY replacement eventually

Land Rover Discovery 3 Estimated 4000 Euro repair for 40 Euro fixed? Is this possible? - YouTube

Maybe I should have bought a Toyota? Land Rover Discovery 3 - High Pressure Fuel Pump replacement - YouTube

Fuel Injector Balance and Spill Check - Land Rover Discovery 3 TDV6 - YouTube

Originally Posted by DiscoJeffster

“Tell him he’s dreamin’ “

It’ll be back.

First time it happened to me I cleared it and it went away for nearly half a year. I *have* heard stories about it being a blocked filter however, and I can understand how that might be possible, but then if it was a blocked filter it'd happen under load every time.

Ahh well I’ll keep with the dream as long as it lasts ⚠️⚠️ I have it booked in for some tests in a few weeks so let’s wait and see. 👍