AutoCodes – GMC – P013B 2015 GMC Sierra

P013B 2015 GMC Sierra Code - HO2S Slow Response Lean to Rich Bank 1 Sensor 2

Quick Answer

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Heated Oxygen Bank 1 Sensor 2, Heated Oxygen Bank 1 Sensor 2 harness is open or shorted, Heated Oxygen Bank 1 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: P013B 2015 GMC Sierra indicates HO2S Slow Response Lean to Rich Bank 1 Sensor 2.
Common causes: Common causes include Faulty Heated Oxygen Bank 1 Sensor 2, Heated Oxygen Bank 1 Sensor 2 harness is open or shorted, Heated Oxygen Bank 1 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 238

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 P013B 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 accumulated mass airflow monitored during lean-to-rich transitions between 350 - 650 mV is greater than calibrated value.

OBDII Code P013B 2015 GMC Sierra - HO2S Slow Response Lean to Rich Bank 1 Sensor 2 - AutoCodes.com — P013B 2015 GMC Sierra Code - HO2S Slow Response Lean to Rich Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P013B 2015 GMC Sierra?

Faulty Heated Oxygen Bank 1 Sensor 2
Heated Oxygen Bank 1 Sensor 2 harness is open or shorted
Heated Oxygen Bank 1 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 P013B 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 P013B 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 P013B 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P013B on a 2015 GMC Sierra?

- Common symptoms include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light.

2. What does the OBDII code P013B HO2S Slow Response Lean to Rich Bank 1 Sensor 2 mean for a 2015 GMC Sierra?

- This code indicates that the downstream oxygen sensor on bank 1 (cylinder bank containing cylinder 1) is responding slowly as the air-fuel mixture fluctuates from lean to rich.

3. What are the possible causes of the P013B code on a 2015 GMC Sierra?

- Potential causes include a faulty oxygen sensor, a vacuum leak in the intake system, fuel system issues, exhaust leaks, or a problem with the engine's air intake system.

4. How can I diagnose the P013B code on my 2015 GMC Sierra?

- Diagnosing the P013B code involves inspecting the oxygen sensor and its wiring, checking for vacuum leaks, examining the exhaust system for leaks, and ensuring proper fuel delivery.

5. Can I drive my 2015 GMC Sierra with the P013B code?

- It's not recommended to drive the vehicle with the P013B code illuminated, as it can lead to reduced fuel efficiency and potential engine performance issues.

6. How can I repair the P013B code on my 2015 GMC Sierra?

- Repair steps may include replacing the downstream oxygen sensor, fixing any vacuum leaks, addressing fuel system issues, or repairing exhaust leaks to resolve the code.

7. Will resetting the check engine light fix the P013B code on my 2015 GMC Sierra?

- Resetting the check engine light without addressing the underlying issue will not fix the P013B code. It's important to diagnose and repair the root cause of the problem.

8. How much does it cost to repair the P013B code on a 2015 GMC Sierra?

- The cost of repairing the P013B code can vary depending on the specific issue causing the code, the labor rates in your area, and whether you choose to do the repairs yourself or take it to a professional mechanic.

9. Can a clogged catalytic converter cause the P013B code on a 2015 GMC Sierra?

- A clogged catalytic converter can indirectly cause the P013B code by affecting the oxygen sensor readings. It's important to inspect the catalytic converter as part of the diagnostic process.

10. How often should I check the oxygen sensors on my 2015 GMC Sierra to prevent the P013B code?

- It's recommended to inspect and potentially replace the oxygen sensors as part of regular maintenance, typically every 60,000 to 100,000 miles, to help prevent issues like the P013B code.