Code Definition

P0545 — Exhaust gas temperature sensor signal low - Bank 1, Sensor 1

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

About P0545

P0545 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 P0545 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 P0545 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

Fault code P0545 is set when the vehicle's powertrain control module (PCM) detects a low signal voltage from the exhaust gas temperature sensor located in Bank 1, Sensor 1. This condition typically suggests an electrical problem, such as a short to ground, in the sensor circuit. The exhaust gas temperature sensor plays a critical role in monitoring the temperature of exhaust gases in the exhaust system, essential for effective emission control and engine efficiency. A low signal can indicate issues like a faulty sensor, wiring problems, or improper exhaust gas temperatures. Bank 1 generally re...

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