OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P233D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySupply line open or relay defective
- PossibleFuse for regulator B supply blown
- Less likelyPin pushed back out of connector body
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Pressure Regulator B, Regulator B Supply Relay, Fuel Rail
Related codes
- P233AFuel Pressure Regulator C Control Circuit Open
- P233BFuel Pressure Regulator C Control Circuit Low
- P233CFuel Pressure Regulator C Control Circuit High
- P233EFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit Low
- P233FFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit High
- P2340Cylinder 5 Above Knock Threshold
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.