AutoCodes – GMC – P2272 2018 GMC Sierra

P2272 2018 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 2018 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 198

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 2018 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 2018 GMC Sierra - HO2S Signal Stuck Lean Bank 2 Sensor 2 - AutoCodes.com — P2272 2018 GMC Sierra Code - HO2S Signal Stuck Lean Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P2272 2018 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 2018 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 2018 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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P2272 in a 2018 GMC Sierra?

- Common symptoms include poor engine performance, rough idling, reduced fuel efficiency, and the illumination of the check engine light.

2. What does the HO2S signal stuck lean Bank 2 Sensor 2 mean in relation to the P2272 code on a 2018 GMC Sierra?

- This code indicates that the downstream oxygen sensor on the second bank of cylinders is detecting a consistently lean air-fuel mixture.

3. What are the possible causes of the P2272 code in a 2018 GMC Sierra?

- Potential causes include a faulty oxygen sensor, vacuum leaks in the exhaust system, fuel system issues, wiring problems, or an exhaust leak near the sensor.

4. How can I diagnose the P2272 code in my 2018 GMC Sierra?

- Diagnosing this code typically involves inspecting the oxygen sensor, checking for leaks in the exhaust system, testing the fuel system, and examining the wiring harness for any damage.

5. Can I continue driving my 2018 GMC Sierra with the P2272 code?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the engine and potentially worsen fuel efficiency.

6. How can I repair the P2272 code in my 2018 GMC Sierra?

- Repairing this code may involve replacing the oxygen sensor, fixing any exhaust leaks, addressing vacuum leaks, and ensuring the proper functioning of the fuel system components.

7. Will resetting the check engine light fix the P2272 code in a 2018 GMC Sierra?

- Simply resetting the check engine light will not fix the underlying issue causing the P2272 code. It is important to diagnose and repair the problem to prevent it from recurring.

8. How much does it typically cost to fix the P2272 code in a 2018 GMC Sierra?

- The cost of fixing this code can vary depending on the root cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can a DIY enthusiast repair the P2272 code in a 2018 GMC Sierra?

- Depending on the individual's mechanical skills and access to tools, some DIY enthusiasts may be able to address the P2272 code themselves by following repair guides and using the necessary equipment.

10. How often does the P2272 code occur in a 2018 GMC Sierra?

- The occurrence of the P2272 code can vary, but it is not an extremely common code in a 2018 GMC Sierra. If it does occur, prompt attention and diagnosis are recommended to prevent further issues.