AutoCodes – Chevrolet – P2273 2016 Chevrolet Silverado

P2273 2016 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 2016 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 390

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 2016 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 2016 Chevrolet Silverado - HO2S Signal Stuck Rich Bank 2 Sensor 2 - AutoCodes.com — P2273 2016 Chevrolet Silverado Code - HO2S Signal Stuck Rich Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P2273 2016 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 2016 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 2016 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 2016 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 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P2273 in a 2016 Chevrolet Silverado?

The common symptoms of code P2273 "HO2S Signal Stuck Rich Bank 2 Sensor 2" in a 2016 Chevrolet Silverado may include poor fuel efficiency, rough idling, and a noticeable decrease in engine performance.

2. What does the OBDII code P2273 "HO2S Signal Stuck Rich Bank 2 Sensor 2" mean for a 2016 Chevrolet Silverado?

Code P2273 indicates that the downstream oxygen sensor on Bank 2 (the side of the engine opposite the #1 cylinder) is detecting a consistently rich air-fuel mixture condition.

3. What are the potential causes of OBDII code P2273 in a 2016 Chevrolet Silverado?

Potential causes of code P2273 in a 2016 Chevrolet Silverado include a faulty oxygen sensor, a vacuum leak near the sensor, a malfunctioning fuel injector on Bank 2, or issues with the engine's air intake system.

4. How serious is OBDII code P2273 in a 2016 Chevrolet Silverado?

While code P2273 may not cause immediate engine failure, it can lead to decreased fuel efficiency and potentially harm the catalytic converter if left unresolved. It is recommended to address this issue promptly to prevent further damage.

5. Can I continue to drive my 2016 Chevrolet Silverado with OBDII code P2273 present?

It is generally not recommended to drive your Chevrolet Silverado with code P2273 active, as it can lead to decreased fuel efficiency and potential long-term damage to the engine components. It is advisable to have the issue diagnosed and repaired as soon as possible.

6. How can I diagnose and repair OBDII code P2273 in my 2016 Chevrolet Silverado?

Diagnosing code P2273 involves inspecting the Bank 2 Sensor 2 oxygen sensor, checking for vacuum leaks, testing the fuel injectors, and ensuring proper operation of the air intake system. Repair typically involves replacing the faulty components or addressing the root cause of the rich air-fuel mixture.

7. Can a DIY enthusiast fix OBDII code P2273 in a 2016 Chevrolet Silverado?

While some enthusiasts may have the skills to diagnose and repair code P2273, it is recommended to have a professional mechanic perform the diagnosis and repairs, as specialized tools and knowledge may be required to accurately address the issue.

8. Will resetting the OBDII system clear code P2273 in a 2016 Chevrolet Silverado?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing code P2273 is not addressed, the code is likely to reappear. It is crucial to diagnose and repair the root cause of the problem for a permanent solution.

9. How much does it cost to repair OBDII code P2273 in a 2016 Chevrolet Silverado?

The cost of repairing code P2273 can vary depending on the root cause of the issue, the labor rates in your area, and the cost of parts. Repairs may range from a few hundred to over a thousand dollars, depending on the extent of the problem.

10. Can a dirty air filter cause OBDII code P2273 in a 2016 Chevrolet Silverado?

While a dirty air filter can impact engine performance, it is not a common cause of code P2273. However, a clogged air filter can lead to a rich air-fuel mixture, so it is advisable to check and replace the air filter if necessary as part of routine maintenance.