P2A66Alternative Fuel Tank C Level Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2A66 says the tank C level signal is below its lower electrical bound. With voltage-output senders that typically comes from a signal wire grounded somewhere along its route, a sender shorted inside, or a missing supply to a ratiometric Hall module such as those Rochester builds for LPG vessels, which needs a few volts to produce any output. The display consequence is an empty or missing tank C, so a driver may refuel early or think the gas supply is shorter than it is. No manufacturer documents P2A66, and since the petrol code family covers only two senders, the nearest documented relative is the tank B case P2A61. Disconnecting the sender should move the reading; if it stays low, trace the short in the harness.
- What you may notice
- Check engine light
- Tank C displayed as empty
- Refuelling earlier than needed
- Likely causes
- LikelyTank C sender signal wire grounded
- PossibleNo supply voltage at a Hall-type sender
- PossibleTank C sender shorted internally
- 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.