P2246O2 Sensor Reference Voltage Circuit High (Bank 1 Sensor 1)
- 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
- P2246 means the reference voltage line of the bank 1 front wide-band sensor reads too high, typically from a short to battery or heater voltage or a short inside the sensor. No manufacturer publishes a threshold for P2246. GM's 2018 Duramax table 18OBDG04 names it, together with P2245, P2252 and P2253, as a fault that makes the front sensor signal unusable, but gives no setting criteria. Ford logs any wide-band lead that is shorted to supply voltage as P0132 and keeps P2243 for the open line, so Ford vehicles do not use this code. Bosch limits the Nernst cell to a 250 microamp load, which is why an external voltage on this wire can damage the sensor or the interface. CARB requires circuit faults of fuel-control sensors to be detected. P2245 is the low fault, P2250 bank 2.
- What you may notice
- Check engine light
- Higher fuel consumption
- Repeat failure of a new sensor if the wiring short remains
- Likely causes
- LikelyReference voltage wire shorted to heater supply or battery voltage
- PossibleInternal short between heater and Nernst cell in the sensor
- RareFault in the sensor interface of the ECM
- 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: €80 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.