AutoCodes – GMC – P2477 GMC

P2477 GMC Code - Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 4

Quick Answer

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out of range high values. Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) Bank 2 Sensor 4, Exhaust Gas Temperature Sensor Bank 2 Sensor 4 harness is open or shorted, Exhaust Gas Temperature Sensor Bank 2 Sensor 4 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P2477 GMC indicates Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 4.
Common causes: Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) Bank 2 Sensor 4, Exhaust Gas Temperature Sensor Bank 2 Sensor 4 harness is open or shorted, Exhaust Gas Temperature Sensor Bank 2 Sensor 4 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 1,064

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 15, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2477 GMC Description

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out of range high values. The EGTS is located in front of the Diesel Oxidation Catalyst (DOC) and/or in front of the Diesel Particulate Filter (DPF). The EGTS detects exhaust gas temperature and converts it into a voltage and feeds back to the PCM with the voltage signal in order to control engine conditions to effectively reduce emissions. The PCM sets the P2477 OBDII code when the Exhaust Gas Temperature Sensor is out of factory specifications.

OBDII Code P2477 GMC - Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 4 - AutoCodes.com — P2477 GMC Code - Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 4

What does this mean?

What are the Possible Causes of the DTC P2477 GMC?

Faulty Exhaust Gas Temperature Sensor (EGTS) Bank 2 Sensor 4
Exhaust Gas Temperature Sensor Bank 2 Sensor 4 harness is open or shorted
Exhaust Gas Temperature Sensor Bank 2 Sensor 4 circuit poor electrical connection
Exhaust leaks
Excessive particulate matter buildup on sensor

How to Fix the DTC P2477 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2477 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2477 GMC code?

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2477 GMC Code

1. What are the common symptoms of OBDII code P2477 GMC?

- Common symptoms include reduced engine performance, increased fuel consumption, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P2477 GMC?

- Possible causes include a faulty exhaust gas temperature sensor, wiring issues, sensor connector problems, or a malfunctioning PCM.

3. How can I diagnose the cause of OBDII code P2477 GMC?

- Diagnosis typically involves inspecting the EGT sensor, checking the wiring and connectors for damage, and using a scan tool to monitor sensor data and perform tests.

4. Can I continue driving with OBDII code P2477 GMC active?

- It is not recommended to drive with this code active, as it can lead to further damage and poor engine performance. It's best to address the issue promptly.

5. How can I repair OBDII code P2477 GMC?

- Repair may involve replacing the exhaust gas temperature sensor, repairing or replacing damaged wiring or connectors, and clearing the code with a scan tool.

6. Is it possible to reset OBDII code P2477 GMC without fixing the underlying issue?

- While you can clear the code temporarily, it will likely return if the root cause is not addressed. It's important to fix the issue to prevent ongoing problems.

7. What is the function of the exhaust gas temperature sensor in the vehicle?

- The exhaust gas temperature sensor measures the temperature of the exhaust gases to help the engine control module adjust fuel delivery and optimize performance.

8. Can a DIY enthusiast fix OBDII code P2477 GMC at home?

- Depending on your skill level and access to tools, you may be able to address this code at home by following repair guides and using proper diagnostic equipment.

9. How long does it take to repair OBDII code P2477 GMC at a repair shop?

- The repair time can vary based on the exact cause of the code and the shop's workload, but it typically takes a few hours to diagnose and fix the issue.

10. Are there any preventive measures to avoid OBDII code P2477 GMC in the future?

- Regular vehicle maintenance, timely sensor inspections, and addressing any engine performance issues promptly can help prevent the recurrence of this code.