P0549 Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1

Definition: The OBD-II code P0549 indicates that the Engine Control Module (ECM) has detected a high voltage signal from the exhaust gas temperature sensor located on bank 2, sensor 1. This typically means that the sensor is reporting a temperature reading that is higher than expected.

p0549 – Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1

Typical Severity: Moderate

Common Causes

p0549 – Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1

Common causes of this OBD2 code include:

• Faulty exhaust gas temperature sensor
• Short circuit in the wiring of the sensor
• Open circuit in the wiring of the sensor
• Corrosion or poor connections in the sensor circuit
• Issues with the engine control module (ECM)

 

Common Misdiagnosis

OBD2 Code: P0549

Description: Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1

Common Misdiagnosis: Replacing the exhaust gas temperature sensor without checking for wiring issues or connector problems.

 

Common Diagnostic Steps

OBD2 Code: P0549

Description: Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1

• Check for any additional codes that may be present and address those first.
• Inspect the exhaust gas temperature sensor wiring and connectors for damage, corrosion, or disconnection.
• Test the exhaust gas temperature sensor using a multimeter to check for proper resistance values as specified by the manufacturer.
• Verify the integrity of the sensor circuit by checking for continuity between the sensor connector and the engine control module (ECM) connector.
• Ensure there are no exhaust leaks near the sensor that could affect its operation.
• If applicable, update or reflash the ECM software to ensure it is up-to-date with manufacturer specifications.
• If all checks pass but the code persists, replace the exhaust gas temperature sensor with a new one. Ensure it is an OEM part or meets OEM specifications.