Engine-Codes.com
Engine-Codes – GMC – P0031 2018 GMC Sierra

P0031 2018 GMC Sierra Code - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1

Quick Answer

The P0031 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to a fault in the HO2S (Heated Oxygen Sensor) Heater Control Circuit for Bank 1 Sensor 1. Common causes include Faulty HO2S (Heated Oxygen Sensor) Bank 1 Sensor 1, Wiring issues such as shorts or open circuits, Blown fuse related to the sensor heater circuit. 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 GMC Sierra indicates HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1.
Common causes
Common causes include Faulty HO2S (Heated Oxygen Sensor) Bank 1 Sensor 1, Wiring issues such as shorts or open circuits, Blown fuse related to the sensor heater circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0031 2018 GMC Sierra Description

The P0031 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to a fault in the HO2S (Heated Oxygen Sensor) Heater Control Circuit for Bank 1 Sensor 1. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The heater control circuit is designed to quickly bring the sensor up to operating temperature for accurate readings.

OBDII Code P0031 2018 GMC Sierra - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1
P0031 2018 GMC Sierra Code - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1

Common Causes of P0031 2018 GMC Sierra

  1. Faulty HO2S (Heated Oxygen Sensor) Bank 1 Sensor 1
  2. Wiring issues such as shorts or open circuits
  3. Blown fuse related to the sensor heater circuit
  4. Faulty ECM (Engine Control Module)
  5. Corrosion or poor connections in the sensor circuit

Symptoms of P0031 2018 GMC Sierra

  1. Check Engine Light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Rough idling or stalling
  4. Hesitation or lack of power during acceleration
  5. Increased emissions

How to Fix P0031 2018 GMC Sierra

  1. Begin by verifying the P0031 code using a diagnostic scan tool.
  2. Inspect the wiring harness and connectors for any signs of damage or corrosion.
  3. Test the HO2S Bank 1 Sensor 1 heater circuit for continuity and proper voltage.
  4. Replace the oxygen sensor if it is found to be faulty.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0031 2018 GMC Sierra

The typical repair costs for addressing a P0031 code in a 2018 GMC Sierra can range from $150 to $400, depending on the specific cause of the issue and the cost of parts. This estimate includes the price of a new oxygen sensor, potential wiring repairs, and labor costs. It's important to note that the actual repair costs can vary based on factors such as location, the shop's labor rates, and any additional diagnostics or repairs that may be necessary. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate based on your specific situation.

What does this mean?

Tech Notes for P0031 2018 GMC Sierra

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.

Need more information about the P0031 2018 GMC Sierra code?

Need more information on how to fix the P0031 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0031 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 GMC Sierra Code

1. What are the common symptoms of OBDII code P0031 in a 2018 GMC Sierra?

- Common symptoms include decreased fuel efficiency, rough idling, engine misfires, and the illumination of the check engine light.

2. What does the OBDII code P0031 "HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1" indicate in a 2018 GMC Sierra?

- This code indicates that there is low voltage detected in the heated oxygen sensor (HO2S) heater control circuit of the upstream oxygen sensor in Bank 1.

3. What are the possible causes of OBDII code P0031 in a 2018 GMC Sierra?

- Possible causes may include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, a malfunctioning PCM (powertrain control module), or an exhaust leak near the sensor.

4. How can I diagnose and repair OBDII code P0031 in a 2018 GMC Sierra?

- Diagnose by checking the wiring and connectors for damage, testing the oxygen sensor heater circuit, and inspecting the fuse related to the sensor. Repair may involve replacing the oxygen sensor, repairing the wiring, replacing the fuse, or reprogramming the PCM.

5. Can driving with OBDII code P0031 in a 2018 GMC Sierra cause further damage?

- While driving with this code may not immediately harm the vehicle, prolonged driving without addressing the underlying issue can lead to decreased fuel efficiency and potential damage to the catalytic converter.

6. How much does it typically cost to repair OBDII code P0031 in a 2018 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the code and whether you choose to do the repair yourself or take it to a mechanic. Costs may range from around $100 for a DIY fix to several hundred dollars at a repair shop.

7. Is it safe to continue driving a 2018 GMC Sierra with OBDII code P0031?

- It is generally safe to drive the vehicle for a short period with this code, but it is recommended to address the issue promptly to prevent potential problems and ensure optimal engine performance.

8. How long does it take to repair OBDII code P0031 in a 2018 GMC Sierra?

- The repair time can vary depending on the exact cause of the code and your experience level. Simple fixes like replacing a fuse or connector may take less than an hour, while replacing the oxygen sensor or repairing wiring may take a few hours.

9. Can I reset OBDII code P0031 in a 2018 GMC Sierra without fixing the issue?

- While you can clear the code using an OBDII scanner, the check engine light may come back on if the underlying problem is not resolved. It is recommended to fix the issue causing the code before resetting it.

10. Will OBDII code P0031 in a 2018 GMC Sierra cause the vehicle to fail an emissions test?

- Yes, this code can cause the vehicle to fail an emissions test due to the impact on the oxygen sensor's ability to accurately measure the exhaust gases. It is important to address the issue before going for emissions testing.

Discuss the causes and fixes for P0031 2018 GMC Sierra OBDII Code

Submit a New Comment

Code P0031 2018 GMC Sierra comments

No comments found for this page.