AutoCodes – GMC – P0031 2014 GMC Sierra

P0031 2014 GMC Sierra 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 2014 GMC Sierra 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 263

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 2014 GMC Sierra 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 2014 GMC Sierra - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1 - AutoCodes.com — P0031 2014 GMC Sierra Code - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0031 2014 GMC Sierra?

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 2014 GMC Sierra?

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 2014 GMC Sierra 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 2014 GMC Sierra Code

1. What does OBDII code P0031 on a 2014 GMC Sierra mean?

The code P0031 indicates an issue with the HO2S (Heated Oxygen Sensor) Heater Control Circuit for Bank 1 Sensor 1, where the voltage is detected as low.

2. What are the common symptoms of OBDII code P0031 on a 2014 GMC Sierra?

Common symptoms of P0031 may include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light on the dashboard.

3. What are the possible causes of OBDII code P0031 on a 2014 GMC Sierra?

The most common causes of P0031 are a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or issues with the ECM (Engine Control Module).

4. How can I diagnose the HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1 issue on my 2014 GMC Sierra?

To diagnose P0031, you can use an OBDII scanner to read the code, check the oxygen sensor's wiring and connectors for any damage, and test the sensor's heater resistance.

5. Can I continue driving my 2014 GMC Sierra with OBDII code P0031?

While your vehicle may still be operable with P0031, it is recommended to address the issue promptly to prevent further damage and ensure optimal fuel efficiency and engine performance.

6. How can I repair OBDII code P0031 on my 2014 GMC Sierra?

Repairing P0031 may involve replacing the oxygen sensor, repairing or replacing damaged wiring or connectors, checking and replacing fuses if necessary, or resetting the ECM.

7. Is it safe to clear the OBDII code P0031 on my 2014 GMC Sierra without fixing the underlying issue?

Clearing the code without fixing the underlying problem may temporarily turn off the check engine light, but the issue will persist, potentially leading to further complications and affecting vehicle performance.

8. How much does it cost to fix OBDII code P0031 on a 2014 GMC Sierra?

The cost of fixing P0031 can vary depending on the cause of the issue, the parts needed for repair, and whether you perform the repair yourself or take your vehicle to a mechanic. Costs can range from relatively inexpensive for DIY fixes to more costly for professional repairs.

9. Can a DIY enthusiast repair OBDII code P0031 on a 2014 GMC Sierra?

Depending on your skill level and access to tools, DIY enthusiasts can often address P0031 by replacing the oxygen sensor, checking and repairing wiring, or replacing fuses. However, more complex issues may require professional assistance.

10. How can I prevent OBDII code P0031 from appearing on my 2014 GMC Sierra in the future?

To prevent P0031, regular maintenance of your vehicle, including checking the oxygen sensor, inspecting wiring and connectors, and ensuring proper ECM function, can help avoid this issue.