Powertrain, generic (extended)

P2207 NOx Sensor Heater Control Circuit High (Bank 1 Sensor 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Heater element inside the NOx sensor burnt open
Open circuit or short to voltage in the heater wiring
Loose or heat-damaged connector

Symptoms

  • Malfunction indicator lamp on
  • NOx readiness or SCR efficiency faults may follow

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€250–900
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

nox sensornox sensor heaternox sensor wiringecm

Related codes

P2205P2206P2208P2220P22A5

References: law.cornell.edu, static.nhtsa.gov.