P0549 - Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1
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System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P0549 is an OBD-II diagnostic trouble code indicating that the Engine Control Unit (ECU) has detected a high voltage condition in the Exhaust Gas Temperature (EGT) sensor circuit for Bank 2, Sensor 1. This sensor monitors the temperature of the exhaust gases to protect engine components and manage emissions systems (like DPF regeneration). A 'High' input typically means the signal voltage is at the upper limit, often caused by an open circuit in the sensor or wiring, where the pull-up voltage is not being pulled down by the sensor's resistance.
Possible Causes
Faulty Exhaust Gas Temperature (EGT) sensor with internal open circuit
Open circuit in the wiring harness or damaged connector
Corrosion or loose pins in the sensor connector
Wiring shorted to voltage
Faulty Engine Control Unit (ECU)
Symptoms
Recommended Solution
Workflow
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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