AutoCodes – Chevrolet – P0031 2018 Chevrolet Silverado

P0031 2018 Chevrolet Silverado Code - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1

Quick Answer

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted to ground, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0031 2018 Chevrolet Silverado indicates HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted to ground, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 449

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0031 2018 Chevrolet Silverado Description

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach an operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, the ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the Engine Control Module (ECM). The ECM uses Pulse Width Modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects a short to ground in the heater output low side driver circuit of the heated oxygen sensor when the heater is commanded OFF for greater than 5 s.

OBDII Code P0031 2018 Chevrolet Silverado - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1 - AutoCodes.com — P0031 2018 Chevrolet Silverado Code - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0031 2018 Chevrolet Silverado?

Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted to ground
Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection
Heated Oxygen Sensor Bank 1 Sensor 1 circuit fuse
Faulty Engine Control Module (ECM)

How to Fix the DTC P0031 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 does this mean?

Code Tech Notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it takes the sensor to warm up and start sending an adequate signal. The code is set when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the fuse and connector are OK, replacing the O2 Sensor usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0031 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.

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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 P0031 2018 Chevrolet Silverado Code

1. What does the OBDII code P0031 for a 2018 Chevrolet Silverado indicate?

The code P0031 indicates a problem with the HO2S (Heated Oxygen Sensor) heater control circuit on Bank 1 Sensor 1, showing low voltage.

2. What are the common symptoms of OBDII code P0031 in a 2018 Chevrolet Silverado?

Common symptoms include poor fuel efficiency, rough idling, engine misfires, and the illumination of the Check Engine Light.

3. What are the possible causes of the HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1 code in a 2018 Chevrolet Silverado?

Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or issues with the engine control module (ECM).

4. How can I diagnose the OBDII code P0031 in my 2018 Chevrolet Silverado?

Diagnosing the code typically involves checking the oxygen sensor's resistance, inspecting the wiring and connectors for any damage, and testing the fuse related to the sensor's heater circuit.

5. Can I continue driving my 2018 Chevrolet Silverado with the P0031 code present?

It is not recommended to continue driving with the code present, as it can lead to decreased fuel efficiency and potential engine performance issues.

6. How can I repair the HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1 issue in my 2018 Chevrolet Silverado?

Repair options include replacing the faulty oxygen sensor, repairing any damaged wiring or connectors, checking and replacing the fuse if necessary, and resetting the fault code.

7. Is it possible to clear the P0031 code in a 2018 Chevrolet Silverado without fixing the underlying issue?

While you can clear the code with an OBDII scanner, it is crucial to address the root cause to prevent further problems and ensure optimal vehicle performance.

8. How much does it typically cost to fix the P0031 code in a 2018 Chevrolet Silverado?

The cost of repair can vary depending on the exact cause of the issue, but it may involve expenses for parts, labor, and diagnostic fees at a repair shop or dealership.

9. Are there any preventive maintenance tips to avoid encountering the P0031 code in a 2018 Chevrolet Silverado?

Regularly servicing your vehicle, including routine inspections of the oxygen sensors and related components, can help prevent issues leading to the P0031 code.

10. Can a DIY enthusiast with basic automotive knowledge fix the P0031 code in a 2018 Chevrolet Silverado?

While some aspects of diagnosing and repairing the code may be manageable for DIY enthusiasts, it is recommended to seek professional help, especially when dealing with electrical components or sensor replacements.