Powertrain, generic (extended)

P2215 NOx Sensor Circuit Low (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2215 says the NOx value transmitted for bank 2 falls below the smallest figure a healthy sensor can deliver. Because smart NOx sensors talk over CAN, the limit is a concentration in ppm, not a wire voltage. No manufacturer publishes this bank 2 code; the diesels on record send both banks through one SCR system and use P2202 instead. Those bank 1 limits give the scale: GM's 6.6L and 3.0L Duramax flag readings below minus 90 ppm (on the LZ0 only after the dew point is reached, Type B over two trips), VW's 2014 Touareg TDI below minus 105 ppm. A strongly negative value usually comes from a drifted element or a fault inside the sensor electronics. P2216 is the high limit, P2213 the general circuit fault.

Likely causes

NOx element of the bank 2 sensor drifted low
Fault in the measuring electronics of the sensor module
Damaged lead between probe and sensor module

Symptoms

  • Malfunction indicator lamp on
  • Negative NOx value for bank 2 in live data
  • DEF dosing switches to a substitute strategy

Repair estimate

DifficultyMediumDIY possible
Parts and labour€150–1,000
Time0.5–2.5 h

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

Parts involved

nox sensornox sensor wiring

Related codes

P2202P2213P2214P2216P2217

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.