P2207NOx Sensor Heater Control 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
- P2207 is the high-side counterpart of P2206: the heater control circuit of the upstream NOx sensor on bank 1 shows a voltage that is too high for the commanded state, typically an open heater element or a short to supply voltage. CARB requires the diesel OBD system to flag such circuit faults that contradict the command. GM lists P2207 as NOx Sensor Heater Control Circuit High for the 2024 Silverado/Sierra 3.0L diesel (LZ0). Without heating the sensor never becomes ready, so SCR dosing runs without NOx feedback. P2205 is the general heater circuit code, P2206 the low side, and P2208-P2211 concern the heater feedback circuit. P22A5 is the same fault on sensor 2.
- What you may notice
- Malfunction indicator lamp on
- NOx readiness or SCR efficiency faults may follow
- Likely causes
- LikelyHeater element inside the NOx sensor burnt open
- PossibleOpen circuit or short to voltage in the heater wiring
- 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.