AutoCodes – GMC – P040D 2014 GMC Sierra

P040D 2014 GMC Sierra 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 2014 GMC Sierra 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 198

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 2014 GMC Sierra 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 2014 GMC Sierra - Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage - AutoCodes.com — P040D 2014 GMC Sierra Code - Exhaust Gas Recirculation Temperature Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P040D 2014 GMC Sierra?

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 2014 GMC Sierra?

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 2014 GMC Sierra 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 2014 GMC Sierra code?

Need more information on how to fix the P040D 2014 GMC Sierra code? Get Access to Factory Service Manuals

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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 P040D 2014 GMC Sierra Code

1. What does the OBDII code P040D mean on a 2014 GMC Sierra?

P040D indicates an issue with the Exhaust Gas Recirculation (EGR) Temperature Sensor 2, specifically detecting a high voltage in the circuit.

2. What are the common symptoms of a P040D code?

Symptoms may include the check engine light turning on, reduced engine performance, poor fuel efficiency, and potential overheating issues.

3. What causes the P040D code on a 2014 GMC Sierra?

Common causes include a faulty EGR temperature sensor, damaged wiring or connectors in the sensor circuit, or excessive carbon buildup affecting sensor readings.

4. Can I drive my 2014 GMC Sierra with a P040D code?

Driving with this code is not recommended as it can lead to reduced engine performance and potentially cause further damage to the EGR system or engine.

5. How do you diagnose the P040D code on a GMC Sierra?

Diagnosis typically involves using an OBDII scanner, inspecting the EGR temperature sensor and its wiring, and checking for carbon buildup or electrical faults.

6. How do you fix the P040D code on a 2014 GMC Sierra?

Repairs may include replacing the EGR temperature sensor, cleaning the EGR system, repairing damaged wiring, or updating the vehicle's software if a known issue exists.

7. How much does it cost to fix a P040D code?

Depending on the cause, repairs can range from $100-$300 for parts and labor, with EGR temperature sensor replacement being a common fix.

8. What happens if I ignore the P040D code?

Ignoring the code can lead to further engine performance issues, increased emissions, and potential damage to other components in the EGR system.

9. Can cleaning the EGR system fix the P040D code?

In some cases, cleaning carbon buildup in the EGR system can resolve the issue if the sensor is not damaged.

10. Is the EGR temperature sensor the same as the EGR valve?

No, the EGR temperature sensor monitors exhaust gas temperatures, while the EGR valve controls the flow of exhaust gases back into the intake manifold.