Code Definition

P0549 — Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1

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

About P0549

P0549 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 P0549 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 P0549 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 logged when the engine control module (ECM) detects a higher than normal voltage signal from the exhaust gas temperature sensor located on Bank 2, Sensor 1. This condition is indicative of an open circuit or a loss of ground in the sensor circuit. The exhaust gas temperature sensor in this position monitors the temperature of the exhaust gases upstream in the exhaust system on Bank 2. A high voltage signal typically signifies that the temperature reading is erroneously high, which can adversely impact the engine's emission control and performance.

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