P2A5CAlternative Fuel Vaporizer C Outlet Temperature Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2A5C stands for a vaporizer C outlet signal below the valid range. Since such inputs are normally NTC thermistors, the module would read an implausibly hot unit; a signal lead touching ground or a sensor shorted internally is far more likely. Coolant that has seeped into the connector can also create a path to ground. AC STAG controllers show this as a short in the reducer temperature circuit and advise checking insulation and plug. A wrongly hot vaporizer C is a safety concern, since gas could pass through a unit that is in fact too cold to vaporize it fully. No manufacturer documents P2A5C. Disconnect the sensor and watch the value: a jump to cold means the sensor itself is shorted, no change means the fault sits in the wiring.
- What you may notice
- Check engine light, depending on calibration
- Gas operation blocked or limited
- Vaporizer C shown far too hot
- Likely causes
- LikelySignal lead of sensor C shorted to ground
- PossibleCoolant or water in the connector
- PossibleSensor C shorted inside
- 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 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.