P233D
Fuel Pressure Regulator B Solenoid Supply Voltage Control Circuit Open
The supply line that powers the solenoid of fuel pressure regulator B is open. Without supply the regulator cannot operate and the ECU cannot maintain rail pressure on this stage; sets when the controller sees no current flow even with the solenoid commanded on.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Common causes
Ordered by how often each turns out to be the cause.
- Supply line open or relay defectiveCommon
- Fuse for regulator B supply blownPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Fuel Pressure Regulator B
- Regulator B Supply Relay
- Fuel Rail
P233D 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.