AutoCodes – GMC – P014B 2015 GMC Sierra

P014B 2015 GMC Sierra Code - HO2S Delayed Response Lean to 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: P014B 2015 GMC Sierra indicates HO2S Delayed Response Lean to 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 200

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 P014B 2015 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 detects that the O2 sensor voltage has not increased above 350 mV within a calibrated value of accumulated airflow.

OBDII Code P014B 2015 GMC Sierra - HO2S Delayed Response Lean to Rich Bank 2 Sensor 2 - AutoCodes.com — P014B 2015 GMC Sierra Code - HO2S Delayed Response Lean to Rich Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P014B 2015 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 P014B 2015 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 P014B 2015 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 P014B 2015 GMC Sierra Code

1. What does the OBDII code P014B mean on a 2015 GMC Sierra?

P014B indicates "HO2S Delayed Response Lean to Rich Bank 2 Sensor 2," meaning the oxygen sensor in Bank 2 Sensor 2 is not switching from lean to rich as quickly as expected.

2. What are the symptoms of the P014B code in a 2015 GMC Sierra?

Common symptoms include a check engine light, poor fuel efficiency, rough idling, reduced engine performance, and increased emissions.

3. What causes the P014B code to appear?

Possible causes include a faulty oxygen sensor, an exhaust leak, damaged wiring or connectors, a malfunctioning catalytic converter, or engine performance issues like unburnt fuel.

4. How can I diagnose the P014B code on my 2015 GMC Sierra?

Start by inspecting the wiring and connectors for damage, check for exhaust leaks, use a scan tool to monitor oxygen sensor performance, and perform a fuel trim analysis.

5. Can a faulty oxygen sensor cause the P014B code?

Yes, a failing or slow-responding oxygen sensor in Bank 2 Sensor 2 is a common cause of this code.

6. Is it safe to drive with the P014B code on my 2015 GMC Sierra?

While it may be safe to drive short distances, prolonged driving can lead to reduced fuel efficiency, increased emissions, and potential damage to the catalytic converter.

7. How do I fix the P014B code on a 2015 GMC Sierra?

Repairs may include replacing the oxygen sensor, fixing exhaust leaks, repairing damaged wiring, or addressing engine performance issues.

8. How much does it cost to repair the P014B code?

Replacing an oxygen sensor typically costs between $150-$400, depending on parts and labor. Additional repairs, such as fixing wiring or leaks, may affect the cost.

9. What tools are needed to troubleshoot the P014B code?

You'll need a scan tool or OBDII reader, a multimeter for electrical testing, and possibly a smoke machine to detect exhaust leaks.

10. Can a dirty air filter cause the P014B code?

While unlikely, a severely clogged air filter can affect engine performance, leading to fuel mixture issues that may indirectly contribute to this code.