AutoCodes – Chevrolet – P2273 2014 Chevrolet Silverado

P2273 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado 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 406

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 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado - HO2S Signal Stuck Rich Bank 2 Sensor 2 - AutoCodes.com — P2273 2014 Chevrolet Silverado Code - HO2S Signal Stuck Rich Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P2273 2014 Chevrolet Silverado?

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 2014 Chevrolet Silverado?

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 2014 Chevrolet Silverado 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.

Need more information about the P2273 2014 Chevrolet Silverado code?

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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 2014 Chevrolet Silverado Code

1. What are common symptoms of OBDII code P2273 in a 2014 Chevrolet Silverado?

Common symptoms include decreased fuel efficiency, rough idling, engine misfires, and the illumination of the Check Engine Light.

2. What does "HO2S Signal Stuck Rich Bank 2 Sensor 2" mean in relation to code P2273?

This means that the oxygen sensor (O2 sensor) located in Bank 2 Sensor 2 of the exhaust system is detecting a consistently rich air-fuel mixture.

3. What are the possible causes of OBDII code P2273 in a 2014 Chevrolet Silverado?

Possible causes include a faulty oxygen sensor, issues with the fuel system, vacuum leaks, exhaust leaks, or a malfunctioning engine control module (ECM).

4. How can I diagnose the source of OBDII code P2273 in my Chevrolet Silverado?

Diagnosis typically involves inspecting the Bank 2 Sensor 2 oxygen sensor, checking for vacuum or exhaust leaks, testing the fuel system, and scanning the ECM for any related error codes.

5. Can I continue driving my 2014 Chevrolet Silverado with OBDII code P2273 present?

It is not recommended to drive extensively with this code active, as it can lead to further damage to the engine and emissions system. It's best to address the issue promptly.

6. How can I repair OBDII code P2273 in my Chevrolet Silverado?

Repair may involve replacing the Bank 2 Sensor 2 oxygen sensor, repairing any leaks in the vacuum or exhaust system, addressing fuel delivery issues, or reprogramming the ECM.

7. Is it necessary to reset the ECM after repairing OBDII code P2273?

Yes, resetting the ECM is recommended after resolving the issue to clear the error code and ensure proper functioning of the vehicle's systems.

8. Can a DIY enthusiast fix OBDII code P2273 in a 2014 Chevrolet Silverado?

Depending on your experience and tools, some aspects of the repair, such as replacing the oxygen sensor, may be doable for a DIY enthusiast. However, diagnosing and repairing more complex issues may require professional assistance.

9. How much does it cost to repair OBDII code P2273 in a 2014 Chevrolet Silverado?

Costs can vary depending on the specific cause of the code and whether you choose to address the issue yourself or take it to a mechanic. Expect costs for parts and labor to range from $200 to $500 or more.

10. How long does it typically take to repair OBDII code P2273 in a 2014 Chevrolet Silverado?

The repair time can vary based on the underlying cause and the complexity of the fix. Simple repairs like replacing the oxygen sensor may take an hour or two, while more involved repairs could take several hours or more.