P2291
Injector Control Pressure Too Low - Engine Cranking
During cranking, ICP does not build up enough to fire injectors. Typical no-start condition on HEUI engines from a stuck-open IPR or weak HP oil pump.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- HP oil rail does not pressuriseCommon
Parts involved
- Injection Pressure Regulator
- High Pressure Oil Pump
P2291 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.