P2215
NOx Sensor Circuit Low Bank 2
NOx sensor / emissions
Generic OBD-II
Medium
What it means
P2215 means the PCM detected an abnormally low signal from the bank 2 NOx sensor circuit. The NOx sensor measures nitrogen-oxide levels for the emissions system, so a low or missing signal shows up as an emissions fault rather than a drivability problem — the engine still runs normally. The likely causes are a failing sensor, a short to ground or open in the signal wiring, or a corroded connector.
Medium
Can I keep driving? Drivable — an emissions fault, though on some diesels persistent NOx faults can trigger a speed-limiting derate, so repair it in good time.
Common symptoms
What you'll notice
- Check-engine light on
- Often no noticeable change in how the car drives
- Failed emissions test
- Possible DEF/SCR or reduced-power warning on diesel applications
Common causes
Most likely first
- Faulty NOx sensor on bank 2Likely
- Short to ground or open in the NOx sensor signal wiringCommon
- Poor or corroded connector at the NOx sensorCommon
- Faulty NOx sensor module or PCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for related NOx sensor codes.
- Inspect the bank 2 NOx sensor connector and wiring; a 'circuit low' fault often means a short to ground or a broken signal wire.
- Confirm the sensor has proper power and ground.
- Compare the sensor's live signal to expected values with the engine warm.
- Replace the NOx sensor if it reads low internally. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2215?+
For normal driving, generally yes — it's an emissions monitor. On diesels with SCR, though, repeated NOx faults can force a reduced-power derate, so don't put off the repair.
Can I just clear P2215?+
It comes back until the low-signal fault is fixed, and the emissions monitor stays incomplete in the meantime.
Related codes
Often seen with P2215
Read & clear P2215 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX