P040C GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC P040C 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 P040C 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 P040C 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 P040C GMC code?
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Need Help with the Code?
Get the P040C GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- P040C 2014 GMC Sierra — Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage
- P040C 2015 GMC Sierra — Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage
- P040C 2016 GMC Sierra — Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage
- P040C 2017 GMC Sierra — Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage
- P040C 2018 GMC Sierra — Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage
Frequently Asked Questions about P040C GMC Code
1. What are common symptoms of OBDII code P040C GMC?
The common symptoms of OBDII code P040C GMC include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.
2. What causes the Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage code to trigger?
The P040C code is typically triggered when there is a low voltage reading from the Exhaust Gas Recirculation Temperature Sensor 2, indicating a potential issue with the sensor or its circuit.
3. How can I diagnose the source of the P040C GMC code?
Diagnosing the P040C code involves using a diagnostic scanner to retrieve the trouble code, checking the EGR system components for any visible damage or corrosion, and testing the EGR temperature sensor and its wiring for proper voltage.
4. Can a faulty EGR valve cause the P040C code to appear?
Yes, a faulty EGR valve can contribute to triggering the P040C code, as it can affect the proper functioning of the EGR system and the readings from the EGR temperature sensor 2.
5. What are some repair tips for fixing the P040C GMC code?
Repair tips for addressing the P040C code include cleaning or replacing the EGR temperature sensor 2, checking and repairing any damaged wiring in the sensor circuit, and ensuring proper connections and grounds in the EGR system.
6. Is it safe to continue driving with the P040C code present?
It is not recommended to continue driving with the P040C code present, as it can lead to further engine performance issues and potential damage to other components in the vehicle.
7. Can a DIY enthusiast fix the P040C code at home?
Depending on the level of expertise, a DIY enthusiast may be able to address the P040C code at home by following proper diagnostic procedures and repair steps outlined in the vehicle's service manual.
8. How much does it typically cost to repair the P040C GMC code at a professional mechanic?
The cost of repairing the P040C code at a professional mechanic can vary depending on the extent of the issue, but it may range from $100 to $300 for parts and labor.
9. Will resetting the OBDII system clear the P040C code?
Resetting the OBDII system may temporarily clear the P040C code, but if the underlying issue causing the code is not addressed, it is likely to reappear after driving the vehicle for some time.
10. How can I prevent the P040C code from reoccurring in the future?
To prevent the P040C code from reoccurring, it is essential to perform regular maintenance on the EGR system, including cleaning or replacing components as needed, and addressing any issues promptly to avoid further damage.
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