AutoCodes – Chevrolet – P040E 2018 Chevrolet Silverado

P040E 2018 Chevrolet Silverado Code - Exhaust Gas Recirculation Temperature Sensor 2 Circuit Erratic

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: P040E 2018 Chevrolet Silverado indicates Exhaust Gas Recirculation Temperature Sensor 2 Circuit Erratic.
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 304

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 P040E 2018 Chevrolet Silverado 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 has changed to greater than 25Ω in 0.1 s.

OBDII Code P040E 2018 Chevrolet Silverado - Exhaust Gas Recirculation Temperature Sensor 2 Circuit Erratic - AutoCodes.com — P040E 2018 Chevrolet Silverado Code - Exhaust Gas Recirculation Temperature Sensor 2 Circuit Erratic

What does this mean?

What are the Possible Causes of the DTC P040E 2018 Chevrolet Silverado?

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 P040E 2018 Chevrolet Silverado?

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 P040E 2018 Chevrolet Silverado 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 P040E 2018 Chevrolet Silverado code?

Need more information on how to fix the P040E 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 P040E 2018 Chevrolet Silverado Code

1. What does the OBDII code P040E mean on a 2018 Chevrolet Silverado?

P040E indicates an issue with the Exhaust Gas Recirculation (EGR) Temperature Sensor 2, specifically that its circuit is showing erratic readings.

2. What are the common symptoms of the P040E code?

Symptoms may include an illuminated Check Engine Light, reduced engine performance, rough idling, increased emissions, or poor fuel economy.

3. What causes the P040E code to appear?

Common causes include a faulty EGR temperature sensor, damaged or corroded wiring, a loose electrical connection, or a malfunctioning EGR valve.

4. Can I drive my 2018 Chevrolet Silverado with the P040E code?

Itâ€™s possible to drive with this code, but itâ€™s not recommended. Ignoring it may lead to engine performance issues or increased emissions over time.

5. How do I diagnose the P040E code?

Start by checking the EGR temperature sensor and its wiring for damage. Use a multimeter to test the sensor and inspect the circuit for irregularities.

6. How do I fix the P040E code on my 2018 Silverado?

Repairs may involve replacing the EGR temperature sensor, fixing damaged wiring, cleaning the EGR valve, or updating the vehicle's software if applicable.

7. How much does it cost to repair the P040E code?

Repair costs can range from $100 to $300, depending on whether the EGR temperature sensor or related wiring needs replacement.

8. Can a dirty EGR valve cause the P040E code?

Yes, a clogged or dirty EGR valve can lead to erratic readings from the temperature sensor, triggering the code.

9. Will clearing the P040E code solve the problem?

Clearing the code may turn off the Check Engine Light temporarily, but the issue will likely return unless the underlying cause is addressed.

10. How often does the EGR temperature sensor fail on a 2018 Silverado?

While not a common failure, the sensor can wear out over time or fail prematurely due to exposure to extreme heat or contamination. Regular maintenance can help prevent issues.