P2477 moderate

Exhaust Gas Temperature Sensor (Bank 1 Sensor 3) Circuit High

The P2477 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Temperature Sensor (Bank 1 Sensor 3) Circuit High. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $100 - $400 (parts and labor)

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Common Symptoms

Check Engine Light on
DPF regeneration issues
Reduced engine power
Exhaust temperature warning
Fuel economy decrease

Probable Causes (Ranked by Likelihood)

Failed exhaust gas temperature sensor Very High
Heat-damaged sensor wiring High
Soot contamination on sensor Moderate
ECM sensor circuit fault Low

Step-by-Step Diagnostic Procedure

Read EGT sensor data and compare banks
Inspect sensor wiring for heat damage
Measure sensor resistance
Replace sensor if out of specification

Frequently Asked Questions

What does P2477 mean?

P2477 indicates: Exhaust Gas Temperature Sensor (Bank 1 Sensor 3) Circuit High. The ECM detected an issue that needs diagnosis and repair.

Is P2477 urgent?

This code should be addressed soon to maintain proper engine operation.

What should I check first?

Start with a visual inspection of the sensor wiring and connector. Use a scan tool to read live data. For DPF codes, check soot loading level. For EVAP codes, check the gas cap first.