P2206NOx Sensor Heater Control Circuit Low (Bank 1 Sensor 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- A NOx sensor needs its ceramic element heated to several hundred degrees before it can measure. P2206 means the heater control circuit of the first (upstream) NOx sensor on bank 1 reads low, typically a short to ground or a driver output stuck low. CARB requires diesel OBD to detect heater circuit opens and shorts that conflict with the commanded state. GM's 3.0L Duramax (LZ0) lists it as NOx Sensor Heater Control Circuit Low; Volvo and Mack trucks treat P2206 on the inlet sensor as an internal sensor failure and replace the sensor. P2205 is the general heater circuit fault, P2207 the high side, P2208-P2211 the heater sense circuit. The SCR system loses NOx feedback.
- What you may notice
- Malfunction indicator lamp on
- SCR or emissions warning on the display
- Usually no change in driveability
- Likely causes
- LikelyInternal heater or control-unit fault in the NOx sensor
- PossibleHeater wiring chafed to ground near the exhaust
- RareMoisture or corrosion 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 · 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.