AutoCodes – GMC – P2272 2017 GMC Sierra

P2272 2017 GMC Sierra 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 2017 GMC Sierra 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 218

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 2017 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 greater than 800 mV before accumulated mass airflow exceeds a calibrated value.

OBDII Code P2272 2017 GMC Sierra - HO2S Signal Stuck Lean Bank 2 Sensor 2 - AutoCodes.com — P2272 2017 GMC Sierra Code - HO2S Signal Stuck Lean Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P2272 2017 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 P2272 2017 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 P2272 2017 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 P2272 2017 GMC Sierra Code

What does the OBD-II code P2272 mean on a 2017 GMC Sierra?

P2272 indicates that the downstream oxygen sensor (Bank 2 Sensor 2) is reporting a consistently lean condition, which means the exhaust has too much oxygen.

What are the symptoms of code P2272 on a 2017 GMC Sierra?

Common symptoms include the check engine light turning on, reduced fuel efficiency, rough idling, or a noticeable drop in engine performance.

What causes the P2272 code on a 2017 GMC Sierra?

Potential causes include a faulty oxygen sensor, exhaust leaks near the sensor, damaged wiring or connectors, or an issue with the engine running lean.

How do you diagnose the P2272 code on a 2017 GMC Sierra?

Diagnosis involves using an OBD-II scanner to check for related codes, inspecting the oxygen sensor and wiring, testing the sensor's voltage output, and checking for exhaust leaks.

Can I drive my 2017 GMC Sierra with a P2272 code?

It's possible to drive for a short period, but ignoring the code can lead to decreased fuel efficiency and potential damage to the catalytic converter.

How do you fix the P2272 code on a 2017 GMC Sierra?

Repairs may include replacing the downstream oxygen sensor (Bank 2 Sensor 2), fixing exhaust leaks, repairing damaged wiring or connectors, or addressing engine performance issues causing a lean condition.

Where is Bank 2 Sensor 2 located on a 2017 GMC Sierra?

Bank 2 refers to the side of the engine opposite Cylinder 1, and Sensor 2 is the downstream oxygen sensor located after the catalytic converter on that side.

How much does it cost to fix a P2272 code on a 2017 GMC Sierra?

The cost varies but typically ranges from $150 to $300 for oxygen sensor replacement, depending on parts and labor rates.

Can a bad catalytic converter cause a P2272 code on a 2017 GMC Sierra?

Yes, a failing catalytic converter can affect the downstream oxygen sensor readings and potentially trigger the P2272 code.

What tools are needed to fix the P2272 code on a 2017 GMC Sierra?

Youâ€™ll need an OBD-II scanner, a digital multimeter, and possibly an oxygen sensor socket and basic hand tools for sensor replacement or wiring repairs.