What does code P23B6 mean?

Q: What does code P23B6 mean?

NOx Sensor Supply Voltage Circuit Bank 1 Sensor 3. P23B6 indicates that the powertrain control module has detected an abnormal voltage on the supply circuit feeding the third nitrogen oxide (NOx) sensor on bank 1 of the exhaust system. The computer monitors this circuit for voltage that falls outside the expected range, which can prevent the sensor from reporting accurate NOx levels and may affect emissions compliance.

DTC codes / P23xx · Ignition system and misfire / P23B6

P23B6NOx Sensor Supply Voltage Circuit Bank 1 Sensor 3

P23B6 indicates that the powertrain control module has detected an abnormal voltage on the supply circuit feeding the third nitrogen oxide (NOx) sensor on bank 1 of the exhaust system. The computer monitors this circuit for voltage that falls outside the expected range, which can prevent the sensor from reporting accurate NOx levels and may affect emissions compliance.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.