2.7 TDI: High Fuel Pressure - Causes & Fixes

Hello everyone,

'I have a 2.7 TDI A5 from 2008 with the following error.'

000136 - Fuel Rail/System Pressure
P0088 - 000 - Too High
Freeze Frame:
Fault Status: 01100000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 222,210 km
Time Indication: 0
Date: 2000.14.30
Time: 19:47:41

The preheating light is on, and the car is in a fault mode. If the car is running and I clear the error, it can be driven normally for 500 km. However, as soon as I turn the ignition on, the error reappears.

The car has a new HP pump, 6 new injectors, and no DPF (Diesel Particulate Filter) anymore.

Does anyone have a starting point?

The car has a new HP pump, 6 new injectors, and no DPF (Diesel Particulate Filter) anymore.

Does anyone have a starting point?

Yes, the person who disabled the DPF tinkered with things that should have been left alone.


Let's get the car produced in its standard configuration, and you'll see that the HD error will be gone.

A5 likely has an EDC17 engine control unit, which makes disabling the DPF a bit more complex.

A5 has, as far as I know, an EDC17 engine control unit, and disabling the DPF on that is a bit more complex.

I think it's more likely that it wasn't just the DPF OFF setting that caused it.

Quote:

I think it's more likely that it wasn't just the DPF OFF setting that caused it

.

I once looked at an EDC17-onlyDPFoff file... it's amazing how many things were modified in it.

The EGT state machine wasn't simply disabled, but all the parameters and settings for differential pressure monitoring, fuel mass, etc., related to regeneration requests were modified. Given the complexity, it's not surprising that an incorrect range might be changed sometimes .

Also check the pressure relief valve as well!