AutoCodes – Chevrolet – P040C Chevrolet

P040C Chevrolet 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 Chevrolet 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.

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Code Popularity 2,258

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 P040C Chevrolet 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 less than 147 Ω for greater than 5 s.

OBDII Code P040C Chevrolet - Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage - AutoCodes.com — P040C Chevrolet Code - Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P040C Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

Need more information on how to fix the P040C Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P040C Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P040C 2014 Chevrolet Silverado — Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage
P040C 2015 Chevrolet Silverado — Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage
P040C 2016 Chevrolet Silverado — Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage
P040C 2017 Chevrolet Silverado — Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage
P040C 2018 Chevrolet Silverado — Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage

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 P040C Chevrolet Code

1. What are common symptoms of OBDII code P040C in a Chevrolet related to the Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage?

The common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P040C in a Chevrolet?

Possible causes of this code include a faulty Exhaust Gas Recirculation (EGR) temperature sensor, damaged wiring or connectors in the sensor circuit, or issues with the EGR system itself.

3. How can I diagnose the underlying issue causing code P040C in my Chevrolet?

To diagnose the issue, you can use an OBDII scanner to read the code and access live data to monitor the EGR temperature sensor readings. Additionally, performing a visual inspection of the sensor and its wiring for any visible damage can help pinpoint the problem.

4. Are there any DIY repair tips for fixing OBDII code P040C related to the Exhaust Gas Recirculation Temperature Sensor 2 Circuit Low Voltage in a Chevrolet?

If you're comfortable with automotive repairs, you can try replacing the EGR temperature sensor yourself following a repair manual specific to your Chevrolet model. Ensure you have the necessary tools and knowledge to safely complete the repair.

5. Can driving with OBDII code P040C in a Chevrolet cause further damage?

Continuing to drive with this code may lead to reduced fuel efficiency, potential damage to the EGR system, and increased emissions. It's recommended to address the issue promptly to prevent any further complications.

6. How much does it typically cost to repair OBDII code P040C in a Chevrolet at a professional auto repair shop?

The cost of repairing this code can vary depending on the labor rates in your area, the extent of the issue, and whether any parts need to be replaced. On average, expect to pay a few hundred dollars for diagnostics and repairs.

7. Can resetting the Check Engine Light resolve OBDII code P040C temporarily in a Chevrolet?

Resetting the Check Engine Light may temporarily turn off the light, but it will not fix the underlying issue causing the code. It's important to address the root cause of the problem to prevent further issues.

8. Is it safe to drive my Chevrolet with OBDII code P040C if the vehicle is exhibiting no noticeable symptoms?

While driving with no symptoms may seem safe, it's still recommended to address the issue promptly to prevent any potential damage to the EGR system or other components. Ignoring the code can lead to more significant problems down the line.

9. How long does it typically take to repair OBDII code P040C related to the EGR Temperature Sensor 2 Circuit Low Voltage in a Chevrolet?

The repair time can vary based on the exact cause of the code and the complexity of the repair. In general, a skilled mechanic can diagnose and repair this issue within a few hours to a day.

10. Can a faulty EGR temperature sensor cause other OBDII codes to be triggered in a Chevrolet?

Yes, a faulty EGR temperature sensor can affect the overall performance of the EGR system, potentially leading to the triggering of other related OBDII codes. It's essential to address any issues promptly to avoid further complications.