AutoCodes – Chevrolet – P2272 Chevrolet

P2272 Chevrolet Code - HO2S Signal Stuck Lean 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: P2272 Chevrolet indicates HO2S Signal Stuck Lean 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 1,390

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 P2272 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 greater than 800 mV before accumulated mass airflow exceeds a calibrated value.

OBDII Code P2272 Chevrolet - HO2S Signal Stuck Lean Bank 2 Sensor 2 - AutoCodes.com — P2272 Chevrolet Code - HO2S Signal Stuck Lean Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P2272 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 P2272 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 P2272 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

P2272 2014 Chevrolet Silverado — HO2S Signal Stuck Lean Bank 2 Sensor 2
P2272 2015 Chevrolet Silverado — HO2S Signal Stuck Lean Bank 2 Sensor 2
P2272 2016 Chevrolet Silverado — HO2S Signal Stuck Lean Bank 2 Sensor 2
P2272 2017 Chevrolet Silverado — HO2S Signal Stuck Lean Bank 2 Sensor 2
P2272 2018 Chevrolet Silverado — HO2S Signal Stuck Lean 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 P2272 Chevrolet Code

1. What does the OBDII code P2272 mean for a Chevrolet?

Code P2272 indicates that the downstream oxygen sensor (Bank 2, Sensor 2) is detecting a consistently lean air-fuel mixture, suggesting a "stuck lean" signal.

2. What are common symptoms of code P2272 in a Chevrolet?

Symptoms may include poor fuel efficiency, rough idle, reduced engine performance, and possibly an illuminated check engine light.

3. What causes the P2272 code to appear in a Chevrolet?

Common causes include a faulty oxygen sensor, exhaust leaks near Bank 2, wiring issues, or a problem with the engine control module (ECM).

4. How do I diagnose code P2272 in a Chevrolet?

Start by inspecting the oxygen sensor wiring and connections for damage. Check for exhaust leaks around Bank 2 and use a scan tool to monitor live O2 sensor data.

5. Can a bad oxygen sensor cause code P2272 in a Chevrolet?

Yes, a failing downstream oxygen sensor (Bank 2, Sensor 2) is a frequent cause of this code.

6. How do I fix code P2272 on my Chevrolet?

Repairs may include replacing the faulty oxygen sensor, fixing exhaust leaks, repairing damaged wiring, or updating the ECM software.

7. Is it safe to drive a Chevrolet with code P2272?

While the vehicle may still be drivable, neglecting this issue can lead to poor fuel economy and potential damage to the catalytic converter.

8. How much does it cost to repair code P2272 on a Chevrolet?

The cost can vary, but replacing an oxygen sensor typically ranges from $150 to $400, depending on labor and parts.

9. Can an exhaust leak cause the P2272 code in a Chevrolet?

Yes, an exhaust leak near Bank 2 can disrupt oxygen sensor readings and trigger the P2272 code.

10. Do I need a professional mechanic to fix code P2272 on my Chevrolet?

While some fixes, like replacing an oxygen sensor, can be done by skilled DIYers, diagnosing wiring issues or ECM problems may require a professional.