P2216 code meaning
NOx Sensor Circuit High (Bank 2)
Powertrain system Generic code P22xx codes Check engine light
What P2216 means
P2216 is set when the NOx concentration reported for bank 2 exceeds anything the engine could plausibly emit. It belongs to engines with an SCR line per cylinder bank; none of the documented diesels is built that way, and no manufacturer lists P2216 publicly. The bank 1 code P2203 shows what such a check looks like: GM trips at 1,500 or 2,500 ppm on the 6.6L LML and at 2,500 ppm on the 3.0L LZ0 (Type B, two trips), VW at 1,655 ppm on the 2014 Touareg TDI. An overreading probe can make the dosing controller inject too much DEF, risking ammonia slip, so the reading is discarded. Internal sensor failure is the most frequent reason. P2215 is the low limit, P2214 a believable but wrong value.
P2216 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2216
- Malfunction indicator lamp on
- Implausibly high NOx value for bank 2 in live data
- SCR efficiency codes may follow
Common causes of P2216
- Most likelyBank 2 NOx sensor reading too high due to internal failure
- PossibleSensing element fouled by oil ash or DEF crystals
- Less likelyCalibration error in the engine or dosing control software
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 P2216 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). |
| 16 | The exact fault in that area. |
What to do next
- Note P2216 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 P2216
What does P2216 mean?
P2216 means "NOx Sensor Circuit High (Bank 2)". P2216 is set when the NOx concentration reported for bank 2 exceeds anything the engine could plausibly emit. It is a generic code, so it means the same on every make.
Is it safe to drive with P2216?
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 P2216 fail an emissions test?
Yes, it can. P2216 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 P2216 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 P2216 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.