P2291: The injection pressure is too low while cranking
The injection pressure is too low while cranking. The engine may be hard to start. It is usually the pump, the regulator or a leak.
| Code | P2291 |
|---|---|
| System | Engine and transmission |
| Group | P22xx, NOx sensors, oxygen sensors and emissions |
| Type | Generic: it means the same on every make |
How to read and clear P2291 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2291 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P228C The fuel pressure stays below what the regulator can correct
- P228E Fuel pressure regulator 1 has exceeded its learning limit and its signal is low
- P228F Fuel pressure regulator 1 has exceeded its learning limit and its signal is high
- P2290 The injector control pressure is below normal
- P2292 The injector control pressure fails now and then
- P2293 Fuel pressure regulator 2 performance
- P2294 The fuel pressure regulator 2 control has a broken or disconnected wire
- P2295 The fuel pressure regulator 2 control gives a lower signal than normal
- P2200 NOx sensor circuit fault (bank 1)
- P2201 NOx sensor circuit range or performance problem (bank 1)
- P2227 Barometric pressure sensor A range or performance problem
- P2228 Barometric pressure sensor A circuit low
What does code P2291 mean?
The injection pressure is too low while cranking. The engine may be hard to start. It is usually the pump, the regulator or a leak.
How do you clear P2291?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2291 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
