P2207 code meaning
NOx Sensor Heater Control Circuit High (Bank 1 Sensor 1)
Powertrain system Generic code P22xx codes Check engine light
What P2207 means
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.
P2207 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2207
- Malfunction indicator lamp on
- NOx readiness or SCR efficiency faults may follow
Common causes of P2207
- Most likelyHeater element inside the NOx sensor burnt open
- PossibleOpen circuit or short to voltage in the heater wiring
- Less likelyLoose or heat-damaged connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Nox sensorNox sensor heaterNox sensor wiringECM
What each part of P2207 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 07 | The exact fault in that area. |
What to do next
- Note P2207 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2207
What does P2207 mean?
P2207 means "NOx Sensor Heater Control Circuit High (Bank 1 Sensor 1)". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2207?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2207 fail an emissions test?
Yes, it can. P2207 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2207 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P2207 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.