P01C9
Fuel Rail/System Pressure - Too High Bank 2
Rail pressure on bank 2 above the target operating range. Often regulator or sensor fault.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Regulator stuck closedCommon
Parts involved
- Fuel Pressure Regulator
- Fuel Rail Pressure Sensor B2
P01C9 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.