P2224NOx Sensor Heater Sense Circuit High (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2224 is logged when the heater sense signal of the bank 2 NOx sensor is too high, which the electronics sees as a short to supply voltage or as an interrupted heater reading near infinite resistance. The bank 2 code appears in no public manufacturer document. GM documents the bank 1 version P2211 for the 3.0L LZ0 as an HTemp pin shorted toward supply: 80 failed of 160 samples, powertrain relay above 11 V, sensor bus relay switched on, Type B over two trips. Since the sensor module cannot judge cell temperature, it holds back its NOx value and SCR control for that bank falls back on modelled emissions. P2223 is the low direction, P2220 a high fault on the control side, P2225 a sporadic sense fault.
- What you may notice
- Malfunction indicator lamp on after two trips
- Bank 2 NOx sensor stays unready
- Likely causes
- LikelyHeater element in the bank 2 probe open, read as maximum resistance
- PossibleSense lead shorted to a voltage source
- RareFault in the sensor module input stage
- 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.