Code Definition

P043B — Catalyst temperature sensor circuit malfunction Bank 2 sensor 2

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

About P043B

P043B 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 P043B 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 P043B 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) identifies a malfunction within the catalyst temperature sensor circuit for Bank 2 Sensor 2. The malfunction is typically identified as an open circuit, short circuit, or an electrical fault that is inconsistent with the normal operating parameters of the sensor circuit. This detection is based on the ECM's inability to receive a signal that falls within the expected range from the catalyst temperature sensor.

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