P040D 2016 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 2016 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.
Code P040D 2016 GMC Sierra Description
What are the Possible Causes of the DTC P040D 2016 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 2016 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 2016 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.
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Frequently Asked Questions about P040D 2016 GMC Sierra Code
1. What does the OBDII code P040D mean for a 2016 GMC Sierra?
P040D indicates a high voltage issue in the Exhaust Gas Recirculation (EGR) Temperature Sensor 2 circuit, which monitors exhaust gas temperatures for proper EGR system operation.
2. What are the common symptoms of code P040D in a 2016 GMC Sierra?
Symptoms may include the check engine light turning on, reduced engine performance, poor fuel economy, or the engine entering limp mode.
3. What causes the P040D code to appear on a 2016 GMC Sierra?
Common causes include a faulty EGR temperature sensor, damaged wiring or connectors, excessive exhaust soot buildup, or an issue with the engine control module (ECM).
4. How can I diagnose the P040D code on my 2016 GMC Sierra?
Start by using a scan tool to confirm the code, then inspect the EGR temperature sensor, associated wiring, and connectors for signs of damage or corrosion.
5. Can I drive my 2016 GMC Sierra with a P040D code?
While it may be possible to drive with this code, it is not recommended as it can lead to reduced performance and potentially damage the EGR system or other engine components.
6. How do I fix the P040D code on a 2016 GMC Sierra?
Repairs may involve replacing the faulty EGR temperature sensor, cleaning soot buildup in the EGR system, or repairing damaged wiring and connectors.
7. How much does it cost to fix a P040D code on a 2016 GMC Sierra?
The repair cost can vary, but replacing the EGR temperature sensor typically costs between $150 and $300, including parts and labor.
8. Can a dirty EGR valve cause the P040D code on a 2016 GMC Sierra?
Yes, excessive soot or carbon buildup in the EGR valve can cause incorrect temperature readings, leading to a P040D code.
9. Will clearing the P040D code with a scan tool fix the issue?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from reappearing.
10. Is the P040D code related to emissions on a 2016 GMC Sierra?
Yes, the EGR system is part of the vehicle’s emissions control system, and a P040D code can impact emissions and may cause the vehicle to fail an emissions test.
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