What does code P2248 mean?

Q: What does code P2248 mean?

O2 Sensor Reference Voltage Performance (Bank 2 Sensor 1). P2248 indicates that the powertrain control module (PCM) has detected an abnormal reference voltage signal from the upstream oxygen sensor on bank 2, which monitors the exhaust from the cylinder bank that does not contain cylinder 1. The PCM expects a specific reference voltage, typically around 0.45 volts, to be present on the sensor's signal circuit, and it sets this code when the voltage deviates from the expected range or is not stable.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P2248

P2248O2 Sensor Reference Voltage Performance (Bank 2 Sensor 1)

P2248 indicates that the powertrain control module (PCM) has detected an abnormal reference voltage signal from the upstream oxygen sensor on bank 2, which monitors the exhaust from the cylinder bank that does not contain cylinder 1. The PCM expects a specific reference voltage, typically around 0.45 volts, to be present on the sensor's signal circuit, and it sets this code when the voltage deviates from the expected range or is not stable.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

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.