P233F
Fuel Pressure Regulator B Solenoid Supply Voltage Control Circuit High
Same as P233D but with the supply line shorted to a higher potential than expected, so the ECU measures more voltage on the regulator B feed than the commanded level allows.
- 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 shorted to a higher voltage railCommon
- Supply relay contact welded closedLess likely
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Fuel Pressure Regulator B
- Regulator B Supply Relay
P233F 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.