P223CO2 Sensor Pumping Current Range/Performance (Bank 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
- P223C judges whether the pump current of the bank 1 wide-band sensor makes sense while the engine is coasting with fuel cut off. In that state the sensor sees almost pure air and, as Bosch's LSU 4.9 data show, must drive a clearly positive current. GM's tables (2016, 2018, 2019) start the test after 5 s of fuel cut-off and stop it at 12 s, with the reference cell above about 600 °C. Three windows count as faulty: current too large (above 5.0 mA, or 4.18 mA with the Delphi interface), close to zero (within ±0.3 or ±0.1 mA), or negative (below -0.10 mA). Each window has its own counter, e.g. 40 failures in 160 samples at 25 ms; the code is Type B. GM notes that it also catches open pump, reference-cell and reference-ground circuits. P223D is bank 2.
- What you may notice
- Check engine light after two drives
- Usually no noticeable change in driving behaviour
- Likely causes
- LikelyAged or poisoned wide-band sensor with wrong pump current in air
- PossibleOpen pump-current, reference-cell or reference-ground wire
- RareExhaust leak or misfire that distorts the gas at the 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: €90 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.