AutoCodes – GMC – P2273 GMC

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

Quick Answer

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Heated Oxygen Bank 2 Sensor 2, Heated Oxygen Bank 2 Sensor 2 harness is open or shorted, Heated Oxygen Bank 2 Sensor 2 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: P2273 GMC indicates HO2S Signal Stuck Rich Bank 2 Sensor 2.
Common causes: Common causes include Faulty Heated Oxygen Bank 2 Sensor 2, Heated Oxygen Bank 2 Sensor 2 harness is open or shorted, Heated Oxygen Bank 2 Sensor 2 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 2,001

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 May 28, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P2273 GMC Description

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Engine Control Module (ECM) operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0 - 1, 000 mV. Once sufficient HO2S voltage fluctuation is observed by the ECM, Closed Loop is entered. The ECM uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM does not detect an HO2S voltage less than 100 mV before accumulated mass airflow exceeds a calibrated value.

OBDII Code P2273 GMC - HO2S Signal Stuck Rich Bank 2 Sensor 2 - AutoCodes.com — P2273 GMC Code - HO2S Signal Stuck Rich Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P2273 GMC?

Faulty Heated Oxygen Bank 2 Sensor 2
Heated Oxygen Bank 2 Sensor 2 harness is open or shorted
Heated Oxygen Bank 2 Sensor 2 circuit poor electrical connection
Low or high fuel system pressure
Fuel contamination
Faulty fuel injectors
Exhaust gas leaks
Engine vacuum leaks

How to Fix the DTC P2273 GMC?

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

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

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2273 GMC 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 GMC Models

P2273 2014 GMC Sierra — HO2S Signal Stuck Rich Bank 2 Sensor 2
P2273 2015 GMC Sierra — HO2S Signal Stuck Rich Bank 2 Sensor 2
P2273 2016 GMC Sierra — HO2S Signal Stuck Rich Bank 2 Sensor 2
P2273 2017 GMC Sierra — HO2S Signal Stuck Rich Bank 2 Sensor 2
P2273 2018 GMC Sierra — HO2S Signal Stuck Rich Bank 2 Sensor 2

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 GMC Code

1. What are the common symptoms of OBDII code P2273 GMC?

- Common symptoms include poor fuel economy, rough idling, engine hesitation, and the illumination of the check engine light.

2. What does the OBDII code P2273 GMC indicate?

- The code indicates that the downstream oxygen sensor on bank 2, sensor 2 is detecting a consistently rich air-fuel mixture.

3. What are the possible causes of OBDII code P2273 GMC?

- Potential causes include a faulty oxygen sensor, a fuel injector issue, a vacuum leak, exhaust system leaks, or a problem with the engine's air intake system.

4. How can I diagnose the issue related to OBDII code P2273 GMC?

- To diagnose the problem, you can use an OBDII scanner to read the code, visually inspect the oxygen sensor and related components, and perform tests to pinpoint the source of the rich mixture.

5. What are the implications of ignoring OBDII code P2273 GMC?

- Ignoring the code can lead to reduced fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.

6. Can I drive my vehicle with OBDII code P2273 GMC?

- It is generally not recommended to drive the vehicle with this code active, as it can lead to further damage and worsen the existing issues.

7. How can I repair OBDII code P2273 GMC?

- Repair options may include replacing the oxygen sensor, addressing fuel system issues, fixing vacuum leaks, or repairing exhaust leaks, depending on the root cause of the problem.

8. Is it possible to reset OBDII code P2273 GMC without fixing the underlying issue?

- While you can clear the code with an OBDII scanner, it will likely return if the underlying problem is not addressed.

9. How long does it typically take to repair OBDII code P2273 GMC?

- The repair time can vary depending on the specific cause of the issue, but it may take anywhere from a few hours to a full day to complete the necessary repairs.

10. Can a DIY enthusiast fix OBDII code P2273 GMC, or is it best left to a professional mechanic?

- Depending on your skill level and access to tools, some individuals may be able to address the issue themselves. However, if you are unsure or inexperienced, it is recommended to seek the assistance of a professional mechanic for proper diagnosis and repair.