AutoCodes – Chevrolet – P0031 Chevrolet

P0031 Chevrolet 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 Chevrolet 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 17,013

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

What does this mean?

What are the Possible Causes of the DTC P0031 Chevrolet?

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 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 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.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0031 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.

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Information for Specific Chevrolet Models

P0031 2014 Chevrolet Silverado — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1
P0031 2015 Chevrolet Silverado — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1
P0031 2016 Chevrolet Silverado — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1
P0031 2017 Chevrolet Silverado — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1
P0031 2018 Chevrolet Silverado — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1

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 Chevrolet Code

1. What does the OBDII code P0031 Chevrolet mean?

The code P0031 indicates a problem with the HO2S Heater Control Circuit Low Voltage for Bank 1 Sensor 1 in the Chevrolet's OBDII system.

2. What are the common symptoms of a P0031 Chevrolet code?

Common symptoms of P0031 Chevrolet code may include poor fuel economy, rough idling, engine stalling, and the illumination of the Check Engine Light.

3. What are the possible causes of a P0031 Chevrolet code?

Possible causes of a P0031 Chevrolet code include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a problem with the engine control module (ECM).

4. How can I diagnose a P0031 Chevrolet code?

Diagnosing a P0031 Chevrolet code typically involves checking the oxygen sensor's wiring and connectors for damage, testing the sensor's heater circuit, and verifying the fuse's integrity.

5. How can I repair a P0031 Chevrolet code?

To repair a P0031 Chevrolet code, you may need to replace the Bank 1 Sensor 1 oxygen sensor, repair any damaged wiring or connectors, replace a blown fuse, or address any issues with the engine control module.

6. Can I drive my Chevrolet with a P0031 code?

It is not recommended to drive your Chevrolet with a P0031 code for an extended period, as it can lead to decreased fuel efficiency and potential engine performance issues.

7. How much does it cost to fix a P0031 Chevrolet code?

The cost to fix a P0031 Chevrolet code can vary depending on the root cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can I reset the P0031 Chevrolet code myself?

Yes, you can reset the P0031 Chevrolet code using an OBDII scanner or by disconnecting the car's battery for a few minutes. However, the underlying issue should be addressed to prevent the code from reoccurring.

9. Will a P0031 Chevrolet code cause emissions test failure?

Yes, a P0031 Chevrolet code can cause your vehicle to fail an emissions test, as it indicates a problem with the oxygen sensor's heater circuit, which plays a crucial role in emissions control.

10. How long does it take to fix a P0031 Chevrolet code?

The time it takes to fix a P0031 Chevrolet code can vary based on the specific issue causing the code. Repairs may take anywhere from 30 minutes to a few hours, depending on the complexity of the problem.