P040B 2016 GMC Sierra Code - Exhaust Gas Recirculation Temperature Sensor 2 Performance
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
- P040B 2016 GMC Sierra indicates Exhaust Gas Recirculation Temperature Sensor 2 Performance.
- 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 P040B 2016 GMC Sierra Description
What are the Possible Causes of the DTC P040B 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 P040B 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 P040B 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.
Need more information about the P040B 2016 GMC Sierra code?
Need more information on how to fix the P040B 2016 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P040B 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P040B 2016 GMC Sierra Code
1. What does the OBDII code P040B mean on a 2016 GMC Sierra?
P040B indicates an issue with the Exhaust Gas Recirculation (EGR) Temperature Sensor 2, specifically a performance problem or out-of-range readings.
2. What are the common symptoms of code P040B on a 2016 GMC Sierra?
Symptoms may include a check engine light, reduced fuel efficiency, rough idling, engine hesitation, or increased emissions.
3. What causes the P040B code on a GMC Sierra?
Common causes include a faulty EGR temperature sensor, wiring or connector issues, carbon buildup in the EGR system, or a failed EGR valve.
4. Can I drive my 2016 GMC Sierra with the P040B code?
Driving with this code is possible but not recommended, as it may lead to increased emissions, reduced performance, and potential engine damage over time.
5. How do I diagnose the P040B code on my GMC Sierra?
Start by visually inspecting the EGR temperature sensor and its wiring for damage. Use a scan tool to monitor sensor readings and compare them to the expected range.
6. How do I fix the P040B code on a 2016 GMC Sierra?
Repairs may include replacing the EGR temperature sensor, cleaning the EGR passages, repairing damaged wiring, or replacing the EGR valve if necessary.
7. How much does it cost to fix the P040B code on a GMC Sierra?
The cost can vary but typically ranges from $100 to $300 for parts and labor, depending on whether the EGR temperature sensor or other components need replacement.
8. Can a dirty EGR system trigger the P040B code?
Yes, carbon buildup in the EGR system can restrict airflow and cause the sensor to provide incorrect readings, triggering the code.
9. How can I prevent the P040B code from recurring?
Regular maintenance of the EGR system, such as cleaning the EGR valve and passages, and ensuring the sensor and wiring are in good condition, can help prevent this issue.
10. Will clearing the P040B code with a scan tool fix the problem?
Clearing the code will turn off the check engine light temporarily, but the underlying issue must be addressed to prevent the code from returning.
Discuss the causes and fixes for P040B 2016 GMC Sierra OBDII Code
Code P040B 2016 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
