Engine-Codes.com
Engine-Codes – GMC – P2273 2018 GMC Sierra

P2273 2018 GMC Sierra Code - HO2S Signal Stuck Rich Bank 2 Sensor 2

Quick Answer

The diagnostic trouble code P2273 for a 2018 GMC Sierra indicates an issue with the HO2S (Heated Oxygen Sensor) signal being stuck rich on Bank 2 Sensor 2. Common causes include Faulty oxygen sensor, Vacuum leak in the intake system, Malfunctioning fuel injector. 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
P2273 2018 GMC Sierra indicates HO2S Signal Stuck Rich Bank 2 Sensor 2.
Common causes
Common causes include Faulty oxygen sensor, Vacuum leak in the intake system, Malfunctioning fuel injector.
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 14, 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 P2273 2018 GMC Sierra Description

The diagnostic trouble code P2273 for a 2018 GMC Sierra indicates an issue with the HO2S (Heated Oxygen Sensor) signal being stuck rich on Bank 2 Sensor 2. This means that the oxygen sensor located downstream of the catalytic converter on the second bank of cylinders is reporting a consistently rich air-fuel mixture. The oxygen sensor is responsible for measuring the oxygen content in the exhaust gases, which helps the engine control module (ECM) adjust the air-fuel ratio for optimal combustion.

OBDII Code P2273 2018 GMC Sierra - HO2S Signal Stuck Rich Bank 2 Sensor 2
P2273 2018 GMC Sierra Code - HO2S Signal Stuck Rich Bank 2 Sensor 2

Common Causes of P2273 2018 GMC Sierra

  1. Faulty oxygen sensor
  2. Vacuum leak in the intake system
  3. Malfunctioning fuel injector
  4. Clogged air filter
  5. Issues with the fuel pressure regulator

Symptoms of P2273 2018 GMC Sierra

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Hesitation during acceleration
  4. Engine misfires
  5. Increased emissions

How to Fix P2273 2018 GMC Sierra

  1. Begin by conducting a diagnostic scan to confirm the P2273 code and identify the specific cause of the rich signal.
  2. Inspect the oxygen sensor on Bank 2 Sensor 2 for any signs of damage or contamination. Replace the sensor if necessary.
  3. Check for vacuum leaks in the intake system and repair any leaks found.
  4. Test the fuel injectors for proper operation and replace any faulty injectors.
  5. Inspect and replace the air filter if it is clogged, restricting airflow to the engine.

Cost to Fix P2273 2018 GMC Sierra

The typical repair costs for addressing a P2273 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. Generally, replacing an oxygen sensor can cost between $100 to $300, including parts and labor. However, additional repairs such as fixing vacuum leaks or replacing fuel injectors can increase the overall cost. It is advisable to consult with a qualified mechanic or auto repair shop for an accurate estimate based on the specific diagnosis and required repairs. Keep in mind that labor rates can vary between different locations and types of repair facilities.

What does this mean?

Tech Notes for P2273 2018 GMC Sierra

Replacing the Rear Heated Oxygen Sensors (HO2S) usually takes care of the problem.











User Submitted Video

Need more information about the P2273 2018 GMC Sierra code?

Need more information on how to fix the P2273 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2273 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 P2273 2018 GMC Sierra Code

1. What does the OBDII code P2273 for a 2018 GMC Sierra mean?

The code P2273 indicates a problem with the HO2S (Heated Oxygen Sensor) signal being stuck rich on Bank 2 Sensor 2 in the exhaust system.

2. What are the common symptoms of OBDII code P2273 in a 2018 GMC Sierra?

Common symptoms of P2273 may include decreased fuel efficiency, rough idling, engine hesitation, and potential issues with emissions.

3. What are the possible causes of the HO2S signal stuck rich Bank 2 Sensor 2 error code in a 2018 GMC Sierra?

Possible causes of P2273 include a faulty oxygen sensor, a vacuum leak, a malfunctioning fuel injector, exhaust system leaks, or issues with the engine's air-fuel mixture.

4. How can I diagnose the OBDII code P2273 in my 2018 GMC Sierra?

Diagnosing P2273 typically involves using an OBDII scanner to read the code, inspecting the oxygen sensor, checking for leaks in the exhaust system, and testing the fuel injectors for proper operation.

5. Can I continue to drive my 2018 GMC Sierra with the P2273 trouble code?

It's not recommended to drive with a P2273 code as it can lead to poor engine performance and potential damage to the catalytic converter over time. It's advisable to address the issue promptly.

6. How can I repair the HO2S signal stuck rich Bank 2 Sensor 2 error in my 2018 GMC Sierra?

Repairing P2273 may involve replacing the oxygen sensor, fixing any vacuum or exhaust leaks, cleaning or replacing fuel injectors, and ensuring the air-fuel mixture is within the correct range.

7. Will resetting the OBDII code P2273 on my 2018 GMC Sierra make it go away permanently?

Resetting the code may clear it temporarily, but if the underlying issue causing P2273 is not fixed, the code is likely to reappear during subsequent driving cycles.

8. Is it possible to prevent the OBDII code P2273 from appearing in my 2018 GMC Sierra?

Regular maintenance, such as replacing oxygen sensors at recommended intervals, addressing engine performance issues promptly, and keeping the exhaust system in good condition, can help prevent P2273.

9. Can a DIY enthusiast fix the P2273 error code in a 2018 GMC Sierra?

Depending on the individual's mechanical skills and access to tools, it may be possible to address the P2273 code as a DIY project by following repair guides and utilizing the necessary equipment.

10. How much can I expect to pay for repairing the HO2S signal stuck rich Bank 2 Sensor 2 issue in my 2018 GMC Sierra?

The cost of repairing P2273 can vary based on the specific cause, parts needed, and labor rates. It's advisable to consult with a mechanic for an accurate estimate tailored to your vehicle's needs.

Discuss the causes and fixes for P2273 2018 GMC Sierra OBDII Code

Submit a New Comment

Code P2273 2018 GMC Sierra comments

No comments found for this page.