P22C3O2 Sensor Pumping Current Trim Circuit Low (Bank 2 Sensor 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P22C3 is the low fault on the trim (label resistor) circuit of the bank 2 post-catalyst wide-band probe. Ford's 2012 OBD summary shows how makers can read this for NTK probes: at each key-on the controller switches the heater off, samples a voltage divider and estimates the label resistor; a value too high is taken as a broken or grounded lead and sets the trim-low code (P2630 for the bank 2 front probe). The controller then falls back to the resistor rank stored in memory, so the reading stays usable but less exact. No maker documents P22C3 publicly, and GM reuses the bank 1 slot P22B6 for a NOx sensor oxygen check without a bank 2 equivalent. P22C2 is the open, P22C4 the high variant. The lamp lights.
- What you may notice
- Check engine light
- Code typically appears right after engine start
- Likely causes
- LikelyTrim wire chafed and shorted to ground
- PossibleHigh-resistance or corroded trim terminal raising the measured resistance
- PossibleDefective label resistor in the sensor connector
- 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.