Code Definition

P0548 — Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1

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

About P0548

P0548 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 P0548 is stored, the module has detected a signal or supply voltage lower 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 P0548 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 indicates that the engine control module (ECM) has detected a lower than expected voltage from the exhaust gas temperature sensor on Bank 2, Sensor 1. This condition suggests a possible short to ground in the sensor circuit. The exhaust gas temperature sensor is responsible for measuring the temperature of the exhaust gases, and this particular sensor is located upstream in the exhaust system on Bank 2. A low voltage signal from this sensor typically means that the temperature reading is inaccurately low, which can affect engine performance and emission control systems.

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