P2B7AEVAP System Pressure Sensor/Switch C Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2B7A is the general circuit fault of a third EVAP pressure sensor or switch, C, alongside A (P0450 range) and B (P24D5 range). Each maker assigns the letters itself. Audi V6 and V8 engines (bulletin 2069531, 2022–2025) call it tank ventilation pressure sensor 3, part GX49, and use P2B7A for its electrical fault; the bulletin adds that some control units logged this fault wrongly as P0450. VW uses the code for its fuel tank pressure sensor G400 with NVLD switch on the 2025–2026 Jetta and Taos FWD, where bulletin 01-26-01 blames a too-small orifice in the plug housing. CARB demands that every EVAP input be monitored for circuit faults. Until the fault is fixed, leak tests that rely on this sensor cannot run.
- What you may notice
- Check engine light on
- EVAP readiness monitor stays incomplete
- Usually no change in driving behaviour
- Likely causes
- LikelySensor of an early design (VW G400 with narrow orifice)
- PossiblePressure sensor C failed electrically
- PossibleOpen or short in reference, ground or signal wire
- RareControl unit logs a wrong fault entry (Audi bulletin 2069531)
- 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: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.