P22BAO2 Sensor Positive Current Control Circuit High (Bank 2 Sensor 2)
- 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
- P22BA is set when the pump-current (positive current control) wire of the bank 2 downstream wide-band probe is held above its normal bias, typically through contact with the heater supply or a damaged connector letting battery voltage in. No maker documents this code publicly. Related evidence comes from bank 1 and the front sensors: GM names P22AD for the 3.0 Duramax LM2 in a harness-chafing bulletin, Saab measures about 2.8 V on the pump pins of a healthy upstream probe and rates P2239 as Type B, and Ford reports upstream shorts to power as P0132. The code only applies to dual-bank engines with a wide-band probe after each catalyst. P22B8 is the open, P22B9 the low code, P22AD bank 1. Expect the warning lamp.
- What you may notice
- Check engine light
- Bank 2 downstream oxygen value implausibly high
- Likely causes
- LikelyPump-current wire shorted to the heater feed or battery voltage
- PossibleHeater-to-pump-cell leakage inside the sensor
- RareFaulty sensor interface in 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: €50 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.