P040C 2016 GMC Sierra Code - Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low 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
- P040C 2016 GMC Sierra indicates Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low 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 P040C 2016 GMC Sierra Description
What are the Possible Causes of the DTC P040C 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 P040C 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 P040C 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 P040C 2016 GMC Sierra Code
1. What does the OBDII code P040C mean on a 2016 GMC Sierra?
P040C indicates an issue with the Exhaust Gas Recirculation (EGR) Temperature Sensor 2, where the sensor is reporting a low voltage signal to the engine control module (ECM).
2. What are the common symptoms of code P040C in a 2016 GMC Sierra?
Symptoms may include reduced engine performance, poor fuel efficiency, an illuminated check engine light, rough idling, or increased emissions.
3. What causes the P040C code in a GMC Sierra?
Common causes include a faulty EGR temperature sensor, wiring issues such as damaged or corroded connectors, or a malfunctioning ECM.
4. Can I drive my 2016 GMC Sierra with the P040C code?
While the vehicle may still be drivable, it is not recommended as it can lead to poor performance, higher emissions, and potential damage to the EGR system or engine.
5. How is the P040C code diagnosed?
A mechanic will use an OBDII scanner to confirm the code, inspect the EGR temperature sensor and its wiring, and check for other related codes or faults in the EGR system.
6. How do I fix the P040C code on my GMC Sierra?
Repairs may involve replacing the EGR temperature sensor, repairing or replacing damaged wiring, cleaning the EGR system, or reprogramming the ECM if necessary.
7. How much does it cost to repair the P040C code on a 2016 GMC Sierra?
Repair costs vary but typically range from $150 to $400, depending on whether the EGR temperature sensor or associated wiring needs repair or replacement.
8. Can a dirty EGR valve cause the P040C code?
Yes, a clogged or malfunctioning EGR valve can affect the EGR temperature sensor's readings and trigger the P040C code.
9. How can I prevent the P040C code from reoccurring?
Regular maintenance, such as cleaning the EGR system and inspecting wiring and sensors for damage, can help prevent this code from reoccurring.
10. Does the P040C code affect emissions?
Yes, a faulty EGR temperature sensor can lead to improper EGR system operation, increasing emissions and potentially causing the vehicle to fail emissions testing.
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