What does code P22BC mean?

Q: What does code P22BC mean?

O2 Sensor Reference Voltage Performance (Bank 2 Sensor 2). P22BC indicates that the powertrain control module (PCM) has detected an abnormal reference voltage signal from the downstream oxygen sensor on bank 2, which monitors catalyst efficiency after the catalytic converter. The PCM expects a specific voltage range on the sensor's reference circuit, and when the signal falls outside that range or behaves erratically, it sets this code.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22BC

P22BCO2 Sensor Reference Voltage Performance (Bank 2 Sensor 2)

P22BC indicates that the powertrain control module (PCM) has detected an abnormal reference voltage signal from the downstream oxygen sensor on bank 2, which monitors catalyst efficiency after the catalytic converter. The PCM expects a specific voltage range on the sensor's reference circuit, and when the signal falls outside that range or behaves erratically, it sets this code.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

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