AutoCodes – GMC – P014A GMC

P014A GMC Code - HO2S Delayed Response Rich to 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: P014A GMC indicates HO2S Delayed Response Rich to 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 6,076

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 P014A GMC 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 decreased below 450 mV within a calibrated value of accumulated airflow.

OBDII Code P014A GMC - HO2S Delayed Response Rich to Lean Bank 2 Sensor 2 - AutoCodes.com — P014A GMC Code - HO2S Delayed Response Rich to Lean Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P014A GMC?

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 P014A GMC?

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 P014A GMC 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 P014A GMC code?

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Information for Specific GMC Models

P014A 2014 GMC Sierra — HO2S Delayed Response Rich to Lean Bank 2 Sensor 2
P014A 2015 GMC Sierra — HO2S Delayed Response Rich to Lean Bank 2 Sensor 2
P014A 2016 GMC Sierra — HO2S Delayed Response Rich to Lean Bank 2 Sensor 2
P014A 2017 GMC Sierra — HO2S Delayed Response Rich to Lean Bank 2 Sensor 2
P014A 2018 GMC Sierra — HO2S Delayed Response Rich to 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 P014A GMC Code

1. What are the common symptoms of OBDII code P014A GMC?

- Common symptoms include poor fuel efficiency, rough idling, hesitation or stalling during acceleration, and the illumination of the check engine light.

2. What does the OBDII code P014A GMC indicate?

- This code indicates a delayed response from the downstream oxygen sensor (Bank 2 Sensor 2), where the sensor takes longer than expected to switch from a rich to lean air/fuel mixture.

3. What are the possible causes of code P014A GMC?

- Possible causes include a faulty oxygen sensor, issues with the wiring or connectors related to the sensor, exhaust leaks, engine misfires, or a malfunctioning catalytic converter.

4. How can I diagnose the OBDII code P014A GMC?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, checking the oxygen sensor's response time using a scan tool, inspecting the sensor's wiring and connections, and performing a visual inspection of the exhaust system.

5. Can I drive with the OBDII code P014A GMC active?

- It is not recommended to drive for an extended period with this code active, as it can lead to decreased fuel efficiency, engine performance issues, and potential damage to the catalytic converter.

6. How do I repair OBDII code P014A GMC?

- Repair steps may include replacing the Bank 2 Sensor 2 oxygen sensor, repairing any damaged wiring or connectors, addressing any exhaust leaks, resolving engine misfires, and ensuring the catalytic converter is functioning properly.

7. Is it possible to reset the OBDII code P014A GMC without fixing the underlying issue?

- While you can clear the code with an OBDII scanner, it is not recommended as the issue causing the code will persist, leading to potential long-term engine and emission system problems.

8. How long does it take to repair OBDII code P014A GMC?

- The repair time can vary depending on the exact cause of the issue, but typically, it can take anywhere from 1-3 hours to diagnose and repair the problem causing the delayed response from Bank 2 Sensor 2.

9. Are there any preventive measures to avoid OBDII code P014A GMC?

- Regular maintenance of the oxygen sensors, periodic inspection of the exhaust system, addressing engine performance issues promptly, and using high-quality fuel can help prevent this code from appearing.

10. Can a DIY enthusiast fix OBDII code P014A GMC?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to address this code by following the repair steps carefully, but professional assistance is recommended for accurate diagnosis and repair.