AutoCodes – GMC – P2273 2015 GMC Sierra

P2273 2015 GMC Sierra 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 2015 GMC Sierra 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 296

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 2015 GMC Sierra 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 2015 GMC Sierra - HO2S Signal Stuck Rich Bank 2 Sensor 2 - AutoCodes.com — P2273 2015 GMC Sierra Code - HO2S Signal Stuck Rich Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P2273 2015 GMC Sierra?

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 2015 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

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 2015 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 P2273 2015 GMC Sierra Code

1. What does the OBDII code P2273 for a 2015 GMC Sierra mean?

The code P2273 indicates that the Heated Oxygen Sensor (HO2S) signal is stuck rich on Bank 2 Sensor 2 in your 2015 GMC Sierra.

2. What are the common symptoms of OBDII code P2273 in a 2015 GMC Sierra?

Common symptoms of code P2273 may include decreased fuel efficiency, rough idling, black smoke from the exhaust, and potential engine misfires.

3. What are the possible causes of OBDII code P2273 in a 2015 GMC Sierra?

The code P2273 can be triggered by issues such as a faulty oxygen sensor, a vacuum leak, a rich fuel mixture, a malfunctioning fuel injector, or a problem with the engine's computer system.

4. How can I diagnose OBDII code P2273 in my 2015 GMC Sierra?

Diagnosing code P2273 typically involves using an OBDII scanner to read the code, inspecting the oxygen sensor, checking for vacuum leaks, testing fuel injectors, and verifying the fuel mixture.

5. Can I drive my 2015 GMC Sierra with the OBDII code P2273 present?

It is not recommended to drive your vehicle with the code P2273 active, as it can lead to further damage and potential safety hazards. It's best to address the issue promptly.

6. How can I repair OBDII code P2273 in my 2015 GMC Sierra?

Repairing code P2273 may involve replacing the Bank 2 Sensor 2 oxygen sensor, fixing vacuum leaks, correcting fuel mixture issues, replacing faulty fuel injectors, or resetting the engine's computer system.

7. Is it safe to reset the OBDII code P2273 in my 2015 GMC Sierra without addressing the underlying issue?

Resetting the code without fixing the underlying problem may temporarily clear the warning light, but the issue will likely resurface. It's important to address the root cause of the code.

8. Can a DIY enthusiast fix OBDII code P2273 in a 2015 GMC Sierra?

Depending on your mechanical skills and tools available, some DIY enthusiasts may be able to address code P2273 by replacing the oxygen sensor or checking for vacuum leaks. However, more complex issues may require professional assistance.

9. How much does it typically cost to repair OBDII code P2273 in a 2015 GMC Sierra?

The cost to repair code P2273 can vary based on the underlying issue and labor rates in your area. Replacing an oxygen sensor may cost between $200 to $400, while fixing more extensive problems could be more expensive.

10. How often does OBDII code P2273 occur in a 2015 GMC Sierra?

Code P2273 is not one of the most common OBDII codes, but it can occur in a 2015 GMC Sierra due to various factors affecting the oxygen sensor and fuel mixture. Regular maintenance can help prevent such issues.