P2A6B
Alternative Fuel Rail Pressure Regulator Pressure Sensor Circuit Low
Voltage on the inlet pressure sensor signal line of the alternative fuel rail pressure regulator is below the expected window. Wire shorted to ground or sensor short.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Signal wire shorted to groundCommon
- Internal sensor shortPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Alt Fuel Rail Pressure Regulator
- Alt Fuel Pump
- Afcm
P2A6B 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.