P2211NOx Sensor Heater Sense Circuit High (Bank 1 Sensor 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2211 flags a heater feedback signal above its permitted range on the upstream NOx sensor of bank 1. An open sense line, a short to supply voltage or an interrupted heater element that the electronics reads as maximum resistance are the usual reasons. GM lists it as NOx Sensor Heater Feedback Circuit High for the 3.0L Duramax (LZ0) in the 2024 Silverado/Sierra. Under CARB rules such circuit faults must be detected regardless of operating conditions. P2210 is the low direction, P2208 the general fault, P2209 the performance check and P2207 the high fault on the control side. The NOx sensor stays unready, SCR control falls back on modelled values, and the MIL lights up.
- What you may notice
- Malfunction indicator lamp on
- NOx sensor stays not ready
- Likely causes
- LikelyInterrupted heater element in the NOx sensor
- PossibleOpen sense line or short to voltage
- RareLoose or heat-damaged 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: €250 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.