Hi Guys,

I have 2017 XC 90 D5. I was really delighted with the car until the engine cut out on the road a month ago. After cutting out the engine was turning over but failed to start after that. It has been in the main dealers since. The diagnostics computer in the show "Injector Control Pressure too low. *About 2 days prior to problem arising I noticed a very minor vibration/ struggle when the car was cruising at about 1500 RPM. It was enough that I noticed it but not enough to really effect the driving or cause me concern. No unusual engine sound. Speed Test
2 Injectors were thought to be at fault but when replaced, the fault persisted. The other 2 injectors are now being replaced.
Question:
1. Could all 4 injectors suddenly fail in a car with relatively low mileage of this age?
2. Is the car cutting out at 50mpg symptomatic of injector problems.
3. A non volvo mechanic (but highly regarded) suspects its no injectors but the fuel pump.

Any ideas/ views?

All help appreciated

 

Any reason you posted the same question 3 times? as far as a non volvo mechanic - that's not really a concern. Most cars are designed the same. The year of your car has more to do with the diagnostics to this issue. Example, prior to 2005 or so, Volvos used a fixed pressure pump with a pressure regulator to maintain pressure at the fuel rail. After that, Volvos used a variable pressure pump with a pressure sensor to provide a signal to the pump controller to increase the fuel pressure with the ECU controlling the pressure. Given your fault code, you are being told by the ECU that the pressure at the rail going into was out of range - not that the injectors were bad. There's a different code to say when the solenoid in an injector goes open or shorts so the code is telling you that the fuel pressure went out of spec.