AutoCodes – GMC – P040D GMC

P040D GMC Code - Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage

Quick Answer

The Exhaust Gas Recirculation (EGR) temperature sensors are variable resistors that measure the temperature of the exhaust gas at the inlet and outlet of the EGR cooler. Common causes include Faulty Exhaust Gas Recirculation (EGR) Temperature Sensor 2, Exhaust Gas Recirculation Temperature Sensor 2 harness is open or shorted, Exhaust Gas Recirculation Temperature Sensor 2 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P040D GMC indicates Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage.
Common causes: Common causes include Faulty Exhaust Gas Recirculation (EGR) Temperature Sensor 2, Exhaust Gas Recirculation Temperature Sensor 2 harness is open or shorted, Exhaust Gas Recirculation Temperature Sensor 2 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,695

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 20, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P040D GMC Description

The Exhaust Gas Recirculation (EGR) temperature sensors are variable resistors that measure the temperature of the exhaust gas at the inlet and outlet of the EGR cooler. The Engine Control Module (ECM) supplies 5 volts to the EGR temperature sensor signal circuit and a ground for the low reference circuit. When the EGR temperature sensor is cold, the sensor resistance is high. When the EGR temperature increases, the sensor resistance decreases. The ECM detects a higher voltage on the EGR temperature signal circuit with high sensor resistance. With lower sensor resistance, the ECM detects a lower voltage on the EGR temperature signal circuit. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the EGR temperature sensor resistance is greater than 885 Ω for greater than 5 s

OBDII Code P040D GMC - Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage - AutoCodes.com — P040D GMC Code - Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P040D GMC?

Faulty Exhaust Gas Recirculation (EGR) Temperature Sensor 2
Exhaust Gas Recirculation Temperature Sensor 2 harness is open or shorted
Exhaust Gas Recirculation Temperature Sensor 2 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P040D 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 P040D 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 P040D GMC code?

Need more information on how to fix the P040D GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P040D 2014 GMC Sierra — Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage
P040D 2015 GMC Sierra — Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage
P040D 2016 GMC Sierra — Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage
P040D 2017 GMC Sierra — Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage
P040D 2018 GMC Sierra — Exhaust Gas Recirculation Temperature Sensor 2 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 P040D GMC Code

1. What are common symptoms of OBDII code P040D related to the Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage in a GMC vehicle?

- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and potential stalling.

2. What are the possible causes of OBDII code P040D in a GMC due to the Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage?

- The code may be triggered by a faulty EGR temperature sensor, damaged wiring or connectors, a failed EGR valve, or issues with the ECM.

3. How can I diagnose the cause of OBDII code P040D related to the Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage in my GMC?

- Diagnosis typically involves using a scan tool to read the code, checking the EGR temperature sensor, inspecting wiring for damage, and testing the EGR valve and related components.

4. Can I continue driving my GMC with OBDII code P040D indicating an issue with the Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage?

- It is not recommended to continue driving with this code present, as it can lead to further engine damage and decreased performance. It is best to address the issue promptly.

5. How can I repair OBDII code P040D in my GMC caused by the Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage?

- Repair options may include replacing the EGR temperature sensor, repairing or replacing damaged wiring, cleaning or replacing the EGR valve, or reprogramming the ECM if necessary.

6. Are there any DIY tips for addressing OBDII code P040D related to the Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage in a GMC?

- DIY tips may include checking and cleaning electrical connectors, inspecting and repairing damaged wires, and following the manufacturer's service manual for guidance on component testing and replacement.

7. How important is it to fix OBDII code P040D related to the Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage in a GMC?

- It is important to address this code promptly to prevent potential engine damage, restore proper engine performance, and maintain fuel efficiency.

8. Can a faulty Exhaust Gas Recirculation Temperature Sensor 2 cause other issues besides triggering OBDII code P040D in a GMC?

- Yes, a faulty EGR temperature sensor can cause similar symptoms as OBDII code P040D, such as poor engine performance, reduced fuel efficiency, and potential emissions issues.

9. Is it possible for OBDII code P040D to be a false alarm in a GMC related to the Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage?

- While false alarms are possible, it is recommended to thoroughly diagnose the issue to ensure the accurate identification and resolution of the problem triggering the code.

10. Can a professional mechanic help diagnose and repair OBDII code P040D related to the Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage in my GMC?

- Yes, a professional mechanic with experience in automotive diagnostics can efficiently diagnose and repair the issue causing OBDII code P040D in your GMC for optimal performance and reliability.