AutoCodes – Chevrolet – P2273 Chevrolet

P2273 Chevrolet 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 Chevrolet 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 2,951

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

What does this mean?

What are the Possible Causes of the DTC P2273 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet Models

P2273 2014 Chevrolet Silverado — HO2S Signal Stuck Rich Bank 2 Sensor 2
P2273 2015 Chevrolet Silverado — HO2S Signal Stuck Rich Bank 2 Sensor 2
P2273 2016 Chevrolet Silverado — HO2S Signal Stuck Rich Bank 2 Sensor 2
P2273 2017 Chevrolet Silverado — HO2S Signal Stuck Rich Bank 2 Sensor 2
P2273 2018 Chevrolet Silverado — 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 Chevrolet Code

1. What does the OBDII code P2273 Chevrolet indicate?

The code P2273 indicates that the HO2S (Heated Oxygen Sensor) signal for Bank 2 Sensor 2 is stuck rich, meaning the sensor is reading a consistently high level of fuel in the exhaust.

2. What are the common symptoms of a HO2S Signal Stuck Rich Bank 2 Sensor 2 code?

Common symptoms include decreased fuel efficiency, rough idling, engine misfires, and a noticeable decrease in engine performance.

3. What are the possible causes of the P2273 code in a Chevrolet vehicle?

Possible causes include a faulty HO2S sensor, a vacuum leak, a rich fuel mixture, wiring issues, or a problem with the engine control module (ECM).

4. How can I diagnose the P2273 code on my Chevrolet?

Diagnosis typically involves using an OBDII scanner to read the code, checking the HO2S sensor for proper operation, inspecting for any visible wiring damage, and performing a fuel pressure test.

5. Is it safe to continue driving with a P2273 code present?

It is not recommended to drive with a P2273 code for an extended period, as it can lead to further damage to the engine and emissions system. It's best to address the issue promptly.

6. Can I repair a P2273 code on my Chevrolet myself?

Depending on your mechanical skills, you may be able to address the issue yourself by replacing the HO2S sensor, fixing any wiring problems, or addressing a vacuum leak. However, it's recommended to consult a professional if you're unsure.

7. How much does it typically cost to repair a P2273 code in a Chevrolet?

The cost of repairs can vary depending on the exact cause of the code and the labor rates in your area. Replacing the HO2S sensor can range from $100 to $300, while fixing wiring issues or addressing a rich fuel mixture can cost more.

8. Will a P2273 code cause my Chevrolet to fail an emissions test?

Yes, a P2273 code can cause your vehicle to fail an emissions test due to the rich fuel mixture, which leads to higher emissions. It's important to address the issue before attempting an emissions test.

9. How long does it typically take to repair a P2273 code in a Chevrolet?

The repair time can vary depending on the exact cause of the code and the availability of parts. In general, a skilled mechanic can address the issue within a few hours to a day.

10. Are there any preventive measures I can take to avoid a P2273 code in my Chevrolet?

Regular maintenance, such as changing the oxygen sensors at recommended intervals, ensuring proper fuel system operation, and fixing any leaks promptly, can help prevent the occurrence of a P2273 code.