Code Definition

P046B — Catalyst temperature sensor difference between sensor 1 and sensor 2 signals excessive Bank 2

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

About P046B

P046B 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 P046B is stored, the module has detected 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 P046B 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

This fault code is set when the engine control module (ECM) detects a significant discrepancy between the signals of the catalyst temperature sensors on Bank 2, specifically between Sensor 1 and Sensor 2. The ECM monitors these sensors to assess the operating temperatures within the catalytic converter system. An excessive difference in the readings may indicate a problem such as uneven heating within the catalyst, or an issue with one of the sensors.

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