P2A65Alternative Fuel Tank C Level 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
- For tank C this code reports a level that stays within the valid voltage window yet contradicts what happens to the tank. Examples are a reading that remains unchanged over many kilometres although tank C supplies the engine, no rise after a fill, or a level that disagrees with the pressure in a CNG cylinder. With LPG a float that sticks or a sender fitted at the wrong angle are likely; with calculated CNG levels the error usually sits in the pressure or temperature input. GM's Impala bulletin explains one harmless case: after a cold fill, the gauge may stay below full even though the tank is correctly filled. No manufacturer publishes P2A65; CARB requires rationality monitoring. Cross-check against the mechanical gauge at tank C.
- What you may notice
- Check engine light after several trips
- Level for tank C frozen or illogical
- Range estimate unreliable
- Likely causes
- LikelyFloat in tank C sticking or sender mounted at a wrong angle (LPG)
- PossiblePressure or temperature input of tank C drifting (CNG)
- RareContact resistance shifting the level signal
- 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: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.