P2A56Alternative Fuel Vaporizer B Outlet Temperature Sensor Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- With two vaporizers fed by the same coolant, their outlet temperatures should behave alike, which gives the module a natural cross-check. P2A56 means the vaporizer B reading is electrically fine but out of line with that expectation, with the engine state or with its own history. The plausible window is wide: Westport's LNG patent gives vaporized fuel temperatures anywhere from about −20 °C to +80 °C depending on how the engine runs, so tests rely on comparisons rather than fixed values. Two causes look alike here: a drifting sensor, or vaporizer B really running colder because an air lock or kinked hose starves it of coolant. Feeling both coolant hoses settles it. The second case belongs to P2A8C. No manufacturer publishes P2A56 thresholds.
- What you may notice
- Check engine light, depending on calibration
- Power drop under high load on gas
- Clear temperature gap between vaporizer A and B in live data
- Likely causes
- LikelyVaporizer B sensor reads off or sluggishly
- PossibleVaporizer B gets too little coolant (air lock, kinked or blocked hose)
- RareSensor seated loosely in its port
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.