P2026EVAP Fuel Vapor Temperature Sensor Circuit Low Voltage
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2026 reports a vapor temperature signal stuck near 0 V. With the usual NTC thermistor and pull-up resistor, a low voltage corresponds to an extremely hot reading, so the code nearly always points to a signal wire touching ground or a shorted sensor rather than real heat. Audi names this test explicitly: on 2022–2025 models with four-cylinder engines, guided diagnosis checks P2026 as a too-low voltage at the temperature sensor inside leak detection unit J909, the result an earlier software wrongly filed as P2024. Ford's 2014 code list includes P2026 as a MIL-on fault. No public source gives a numeric threshold. Because the EVAP leak checks use this temperature, they are suspended until the circuit is repaired and the monitor has run again.
- What you may notice
- Check engine lamp on
- Implausibly high vapor temperature in live data
- Likely causes
- LikelySensor signal wire shorted to ground
- PossibleTemperature sensor or leak detection unit shorted internally
- RareMoisture bridging pins at the canister-mounted connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.