What Does P2477 Mean?
The PCM has detected an intermittent or erratic signal from the exhaust gas temperature sensor located at Bank 2, Sensor 4 (typically post-DPF or far downstream). This indicates unstable voltage readings that fall outside expected parameters.
Common Causes
35%
Damaged or corroded EGT sensor connector or wiring
30%
Failing exhaust gas temperature sensor
20%
Intermittent short or open circuit in sensor wiring
10%
PCM internal fault or poor ground connection
5%
Exhaust system vibration causing sensor movement
Diagnostic Steps
1
Step 1: Visually inspect EGT sensor 4 Bank 2 wiring and connector for damage, corrosion, or looseness
2
Step 2: Monitor live data for EGT sensor 4 Bank 2 while wiggling wiring harness to identify intermittent connection
3
Step 3: Measure resistance and voltage at sensor connector; compare to specifications
4
Step 4: Check for proper ground continuity at sensor circuit
5
Step 5: If wiring is intact, replace EGT sensor and retest
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The PCM has detected an intermittent or erratic signal from the exhaust gas temperature sensor located at Bank 2, Sensor 4 (typically post-DPF or far downstream). This indicates unstable voltage readings that fall outside expected parameters.
The most common cause of P2477 (Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 4) is: Damaged or corroded EGT sensor connector or wiring
Typical repair costs for P2477 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive but may enter reduced power mode. Can cause DPF regeneration issues leading to eventual engine damage if ignored.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2477 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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