P2220NOx Sensor Heater Control Circuit High (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2220 is the high-side counterpart of P2219: on the bank 2 NOx sensor, the heater control line carries battery voltage when the heater should be off or regulated, so the element may overheat or the output stage cannot switch. A pinched lead touching a feed wire or a failed driver inside the sensor are the usual causes. The bank 2 code is not documented by any manufacturer. GM's 3.0L LZ0 describes the bank 1 version P2207 as a short to battery at the heater control pin, judged on 80 of 160 samples with over 11 V on the powertrain relay and confirmed as Type B after two trips. P2218 is the open circuit and P2224 a high signal on the heater sense side. Until repaired, SCR control for bank 2 runs without NOx feedback.
- What you may notice
- Malfunction indicator lamp on after two trips
- Bank 2 NOx reading missing or invalid
- Likely causes
- LikelyHeater control lead shorted to a supply wire
- PossibleFailed heater driver inside the bank 2 sensor module
- RareHeat-damaged connector with pins bridged
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €150 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.