P2200 code meaning
NOx Sensor Circuit (Bank 1 Sensor 1)
Powertrain system Generic code P22xx codes Check engine light
What P2200 means
P2200 is the general electrical fault reported for the front NOx sensor on bank 1, the unit ahead of the SCR catalyst. Such sensors carry their own control unit, which checks the probe wiring and reports the result over CAN. GM's 6.6L Duramax (LML) sets P2200 as a Type A fault once an open-circuit status keeps arriving for more than 0.5 s or 10 s, depending on calibration. Ford's 6.7L and 3.0L diesels use it for shorts or opens on the probe lines and for memory checksum errors inside the sensor controller. VW's 2014 Touareg TDI reacts to an error message or a validity ratio of at least 0.5. P2201 covers plausibility, P2202/P2203 a value out of range, P229E the downstream sensor. Dosing loses its feedback and the MIL comes on.
P2200 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2200
- Malfunction indicator lamp on
- No NOx value in live data from the upstream sensor
- SCR or emissions warning, possibly followed by inducement countdown
Common causes of P2200
- Most likelyInternal fault in the NOx probe or its attached control unit
- PossibleDamaged cable between probe and sensor control unit (heat, chafing)
- PossibleMoisture or corrosion in the sensor connector
- Less likelyUnstable supply or ground at the sensor control unit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Nox sensorNox sensor wiring
What each part of P2200 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). |
| 00 | The exact fault in that area. |
What to do next
- Note P2200 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 P2200
What does P2200 mean?
P2200 means "NOx Sensor Circuit (Bank 1 Sensor 1)". P2200 is the general electrical fault reported for the front NOx sensor on bank 1, the unit ahead of the SCR catalyst. It is a generic code, so it means the same on every make.
Is it safe to drive with P2200?
Drive gently and only to a workshop. With P2200 the car can go into limp mode (reduced power) to protect itself.
Will P2200 fail an emissions test?
Yes, it can. P2200 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 P2200 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2200 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.