P223C code meaning
O2 Sensor Pumping Current Range/Performance (Bank 1)
Powertrain system Generic code P22xx codes Check engine light
What P223C means
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.
P223C at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P223C
- Check engine light after two drives
- Usually no noticeable change in driving behaviour
Common causes of P223C
- Most likelyAged or poisoned wide-band sensor with wrong pump current in air
- PossibleOpen pump-current, reference-cell or reference-ground wire
- Less likelyExhaust leak or misfire that distorts the gas at the sensor
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor bank1 sensor1Oxygen sensor wiringECM
What each part of P223C means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 3C | The exact fault in that area. |
What to do next
- Note P223C and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P223C
What does P223C mean?
P223C means "O2 Sensor Pumping Current Range/Performance (Bank 1)". P223C judges whether the pump current of the bank 1 wide-band sensor makes sense while the engine is coasting with fuel cut off. It is a generic code, so it means the same on every make.
Is it safe to drive with P223C?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P223C fail an emissions test?
Yes, it can. P223C is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P223C to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P223C clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.