Powertrain, generic (extended)

P2205 NOx Sensor Heater Control Circuit/Open (Bank 1 Sensor 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

The ceramic element of a NOx sensor only measures once its built-in heater has brought it to several hundred degrees. P2205 reports a break on the heater control side of the upstream sensor on bank 1. GM's 6.6L Duramax (LML) sets it after the sensor has reported an open heater for over 10 s with at least 11 V; on the 3.0L LZ0 it is an open load on the heater control pin. Both are Type A, so the MIL comes on after one trip. Volvo and Mack treat P2205 on the inlet sensor as a probable sensor failure, and GM bulletin 24-NA-094 lists it for an LZ0 software update on 2024 pickups. P2206 and P2207 are shorts low and high, P220E heater power out of range, P22A3 the downstream sensor.

Likely causes

Heater element in the NOx probe burnt through
Broken conductor in the lead between probe and sensor module
Software anomaly (GM 3.0L LZ0 2024, bulletin 24-NA-094)

Symptoms

  • Malfunction indicator lamp on after one trip
  • Upstream NOx sensor never becomes ready
  • SCR warning on the display

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 heater

Related codes

P2206P2207P2208P220EP22A3P2218

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.