P2219NOx Sensor Heater Control Circuit Low (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2219 means the heater control line of the bank 2 NOx sensor is pulled toward ground when it should not be, typically a heater lead chafed against the exhaust or a shorted output stage in the sensor electronics. The control unit then switches the heater off to protect itself. Bank 2 use is not documented by any manufacturer, as known SCR diesels combine both banks. For the bank 1 counterpart P2206, GM's 3.0L Duramax (LZ0) counts 80 failures in 160 samples taken every 25 ms, with relay voltage above 11 V and the dew point passed, and stores a Type B fault lighting the MIL after two trips. Volvo and Mack treat P2206 on their inlet sensor as a sensor failure. P2218 is the open circuit, P2220 the short to power.
- What you may notice
- Malfunction indicator lamp on after two trips
- Bank 2 NOx sensor stays cold and delivers no value
- Likely causes
- LikelyHeater lead of the bank 2 sensor chafed through to ground
- PossibleShorted heater or output stage inside the sensor
- RareSalt water bridging pins in the connector
- 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.