P233E
Fuel Pressure Regulator B Solenoid Supply Voltage Control Circuit Low
The supply line that powers the solenoid of fuel pressure regulator B is below the expected voltage with the regulator commanded active - typically a high-resistance feed, partial short to ground or weak relay contact.
- 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 feed has high contact resistanceCommon
- Partial short to ground on supply linePossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Fuel Pressure Regulator B
- Regulator B Supply Relay
P233E 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.