P22B2O2 Sensor Negative Current Control Circuit/Open (Bank 1 Sensor 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P22B2 indicates an open negative current control line on the bank 1 downstream wide-band probe. This is the shared return of pump and sensing cell, the virtual ground (VM/IPN on Bosch, COM on NTK), which the controller holds at a mid-level bias of around 2.5 V. Chrysler lists the code for 2010-2012 Ram 2500/3500 with the 6.7 Cummins and repairs connectors and wiring first; GM names it in 21-NA-149 for the 3.0 Duramax LM2. For the upstream twin P2251, Ford sees an open return as a sensor voltage stuck near 1.5 V for 10 s, GM and Saab as 1.47-1.53 V with cell resistance above 570 ohms. P22B3/P22B4 cover low/high, P22BF bank 2. The warning lamp lights; drivability normally stays the same.
- What you may notice
- Check engine light
- Downstream oxygen reading frozen near a fixed value
- Aftertreatment readiness not set
- Likely causes
- LikelyLoose, corroded or pushed-back terminal on the return wire
- PossibleReturn (virtual ground) wire broken in the harness
- PossibleInternal open circuit in the downstream wide-band sensor
- 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: €0 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.