Davegsm82
Veteran Member
Driving to work this morning I got a flashing GP lamp and lack of power, what felt like a misfire (more like a rev-limiter) above 2500rpm.
At the same time and Error popped up on the MFD saying Start-Stop system error. Probably unrelated but I did notice that it happened immediately after the SS became available, about 7 miles away from home, because the status screen was up on the infotainment unit.
Fault persisted after turning the engine off/on.
managed to get VCDS plugged in and the codes are pointing to fuel pump issues, before clearing codes and trying to start again I had;
5211 P0087 - fuel rail system pressure - too low
5212 P0087 - fuel rail system pressure - too low
5231 P0087 - fuel rail system pressure - too low
10058 P3045 - Fuel pump - electronics defective
10062 P3044 - Fuel pump - short circuit.
After clearing, still have the last 2 codes relating to fuel pump and the engine will still not start, it occasionally splutters and tries to fire but fails every time.
I Have checked the HP fuel pump (CP4) on the front of the engine and the filter, I expected to see metal shards if the pump had failed but all I could see were 2x tiny little flecks of silver, barely a hairs width and maybe 1mm long on top of the filter. Absolutely nothing at all inside of the N290 valve housing on the pump, completely clean inside and the strainer on the valve is also clean. Fuel filter was also full to the brim.
In VCDS, using the measurement units the ID for "High Fuel pressure: control deviation" shows 290100 hPa at ignition on, during cranking this sometimes gets up to about 350000~, but when you look at the ID for "Fuel pressure valve: desired pressure" (possibly not the exact description but close enough) it shows exactly 850000 hPa.
Obviously from this it looks like the HPFP isn't building enough pressure. Whether this is because of failure or restriction down the line I'm not sure.
The only other thing I've tried is to check the connector and what wire I could see on the HPFP top front of the engine, and also ran output test in the engine control unit on the LPFP (lift pump) in the fuel tank, which I could hear chuntering away - not a continuous noise but more like clicking from under the back seat, more audible from outside of the vehicle. Does anyone know if this is normal?
Any advice on this is welcomed as I am at work until 6.30pm and I have normal socket sets, hand tools, multimeter etc available so can try various things.
At the same time and Error popped up on the MFD saying Start-Stop system error. Probably unrelated but I did notice that it happened immediately after the SS became available, about 7 miles away from home, because the status screen was up on the infotainment unit.
Fault persisted after turning the engine off/on.
managed to get VCDS plugged in and the codes are pointing to fuel pump issues, before clearing codes and trying to start again I had;
5211 P0087 - fuel rail system pressure - too low
5212 P0087 - fuel rail system pressure - too low
5231 P0087 - fuel rail system pressure - too low
10058 P3045 - Fuel pump - electronics defective
10062 P3044 - Fuel pump - short circuit.
After clearing, still have the last 2 codes relating to fuel pump and the engine will still not start, it occasionally splutters and tries to fire but fails every time.
I Have checked the HP fuel pump (CP4) on the front of the engine and the filter, I expected to see metal shards if the pump had failed but all I could see were 2x tiny little flecks of silver, barely a hairs width and maybe 1mm long on top of the filter. Absolutely nothing at all inside of the N290 valve housing on the pump, completely clean inside and the strainer on the valve is also clean. Fuel filter was also full to the brim.
In VCDS, using the measurement units the ID for "High Fuel pressure: control deviation" shows 290100 hPa at ignition on, during cranking this sometimes gets up to about 350000~, but when you look at the ID for "Fuel pressure valve: desired pressure" (possibly not the exact description but close enough) it shows exactly 850000 hPa.
Obviously from this it looks like the HPFP isn't building enough pressure. Whether this is because of failure or restriction down the line I'm not sure.
The only other thing I've tried is to check the connector and what wire I could see on the HPFP top front of the engine, and also ran output test in the engine control unit on the LPFP (lift pump) in the fuel tank, which I could hear chuntering away - not a continuous noise but more like clicking from under the back seat, more audible from outside of the vehicle. Does anyone know if this is normal?
Any advice on this is welcomed as I am at work until 6.30pm and I have normal socket sets, hand tools, multimeter etc available so can try various things.
