Code Definition

P2246 — O2 Sensor Reference Voltage Circuit High Bank 1 Sensor 1

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P2246

P2246 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2246 is stored, the module has detected a signal or supply voltage higher than the expected operating range; a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2246 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

Bank 1 sensor 1 on most modern vehicles is a wide band air fuel ratio sensor that relies on a precise internal reference voltage supplied and monitored by the engine control module. DTC P2246 sets when the ECM measures the reference voltage in this sensor circuit as higher than the expected value, which points to a short to voltage, a wiring fault, or an internal sensor problem. Because the ECM uses this sensor to control the air fuel mixture, a corrupted reference makes the fuel trims and closed loop control unreliable. When the code is set the ECM may default to open loop operation, causing ...

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