AutoCodes – GMC – P2471 GMC

P2471 GMC Code - Exhaust Gas Temperature Sensor 4 Circuit High Voltage

Quick Answer

The Exhaust Gas Temperature sensors (EGTS) are variable resistors that measure the temperature of the exhaust gas. Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) 4, Exhaust Gas Temperature Sensor 4 harness is open or shorted, Exhaust Gas Temperature 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: P2471 GMC indicates Exhaust Gas Temperature Sensor 4 Circuit High Voltage.
Common causes: Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) 4, Exhaust Gas Temperature Sensor 4 harness is open or shorted, Exhaust Gas Temperature 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,807

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 Jul 03, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2471 GMC Description

The Exhaust Gas Temperature sensors (EGTS) are variable resistors that measure the temperature of the exhaust gas. Exhaust temperature sensor 1 is the first exhaust temperature sensor in the exhaust system, the following exhaust temperature sensors are counted upward from the engine outlet to the exhaust system end. The Engine Control Module (ECM) supplies 5 V to the exhaust gas temperature signal circuit and supplies a ground to the low reference circuit. The exhaust gas temperature sensor temperature information is used by the ECM during the exhaust gas particulate filter cleaning process. The Diagnostic Trouble Code (DTC) will ve set when the ECM detects that the exhaust gas temperature sensor is greater than 900 Ω for greater than 2 s.

OBDII Code P2471 GMC - Exhaust Gas Temperature Sensor 4 Circuit High Voltage - AutoCodes.com — P2471 GMC Code - Exhaust Gas Temperature Sensor 4 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2471 GMC?

Faulty Exhaust Gas Temperature Sensor (EGTS) 4
Exhaust Gas Temperature Sensor 4 harness is open or shorted
Exhaust Gas Temperature Sensor 4 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2471 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 does this mean?

Code Tech Notes

After starting the engine, the exhaust gas temperature sensor temperature should rise steadily, then stabilize after the engine reaches operating temperature. Exhaust gas temperature sensors may fail intermittently while operating under extreme temperatures. Review the Freeze Frame/Failure Records to verify the failure criteria.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2471 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 P2471 GMC code?

Need more information on how to fix the P2471 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2471 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P2471 2014 GMC Sierra — Exhaust Gas Temperature Sensor 4 Circuit High Voltage
P2471 2015 GMC Sierra — Exhaust Gas Temperature Sensor 4 Circuit High Voltage
P2471 2016 GMC Sierra — Exhaust Gas Temperature Sensor 4 Circuit High Voltage
P2471 2017 GMC Sierra — Exhaust Gas Temperature Sensor 4 Circuit High Voltage
P2471 2018 GMC Sierra — Exhaust Gas Temperature Sensor 4 Circuit High Voltage

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 P2471 GMC Code

What does the OBDII code P2471 mean for a GMC vehicle?

P2471 indicates a high voltage issue in Exhaust Gas Temperature Sensor 4, which monitors exhaust temperatures to protect components like the catalytic converter or diesel particulate filter.

What are the common symptoms of code P2471 on a GMC?

Symptoms may include an illuminated check engine light, poor fuel efficiency, reduced engine performance, or the vehicle entering limp mode.

What causes the P2471 code to appear on a GMC?

Common causes include a faulty exhaust gas temperature sensor, damaged sensor wiring, corrosion in the electrical connectors, or an issue with the engine control module (ECM).

How can I diagnose code P2471 on my GMC?

Start by using a scan tool to confirm the code, then inspect the Exhaust Gas Temperature Sensor 4, its wiring, and connectors for damage or corrosion. Perform voltage and resistance tests on the sensor.

Can I drive my GMC with a P2471 code?

Driving with this code is not recommended as it could lead to damage to the catalytic converter or diesel particulate filter due to inaccurate exhaust temperature readings.

How do I fix the P2471 code on a GMC?

Repairs may include replacing the faulty exhaust gas temperature sensor, repairing damaged wiring or connectors, or reprogramming the ECM if necessary.

Is the P2471 code specific to diesel GMC vehicles?

While more common in diesel vehicles due to their use of multiple exhaust gas temperature sensors, this code can also occur in gasoline engines with similar sensor setups.

How much does it cost to repair code P2471 on a GMC?

The cost can range from $150 to $350, depending on whether the sensor needs replacement or if additional wiring repairs are required.

Can a P2471 code cause long-term damage to my GMC?

Yes, if left unaddressed, it can result in damage to expensive components like the catalytic converter or diesel particulate filter due to incorrect temperature monitoring.

What tools are needed to troubleshoot the P2471 code on a GMC?

Youâ€™ll need an OBDII scan tool, a multimeter for testing voltage and resistance, and possibly a wiring diagram for your vehicleâ€™s exhaust system.