AutoCodes – GMC – P015C 2016 GMC Sierra

P015C 2016 GMC Sierra Code - Oxygen Sensor Delayed Response Rich to Lean Bank 2 Sensor 1

Quick Answer

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1, Heated Oxygen Sensor Bank 2 Sensor 1 harness is open or shorted, Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P015C 2016 GMC Sierra indicates Oxygen Sensor Delayed Response Rich to Lean Bank 2 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1, Heated Oxygen Sensor Bank 2 Sensor 1 harness is open or shorted, Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 223

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 29, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P015C 2016 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 HO2S 1 rich-to-lean or lean-to-rich average response time is greater than a calibrated value for greater than 60s.

OBDII Code P015C 2016 GMC Sierra - Oxygen Sensor Delayed Response Rich to Lean Bank 2 Sensor 1 - AutoCodes.com — P015C 2016 GMC Sierra Code - Oxygen Sensor Delayed Response Rich to Lean Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P015C 2016 GMC Sierra?

Faulty Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
Heated Oxygen Sensor Bank 2 Sensor 1 harness is open or shorted
Heated Oxygen Sensor Bank 2 Sensor 1 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 P015C 2016 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 Front Heated Oxygen Sensors (HO2S) usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P015C 2016 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 P015C 2016 GMC Sierra Code

1. What does the OBDII code P015C mean on a 2016 GMC Sierra?

P015C indicates "Oxygen Sensor Delayed Response Rich to Lean Bank 2 Sensor 1," meaning the upstream oxygen sensor on bank 2 is taking too long to switch from a rich to a lean condition.

2. What are the common symptoms of the P015C code on a 2016 GMC Sierra?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, rough idling, and possible hesitation during acceleration.

3. What causes the P015C code to appear on a 2016 GMC Sierra?

Common causes include a faulty oxygen sensor, exhaust leaks near the sensor, wiring issues, or a buildup of carbon deposits on the sensor.

4. How can I fix the P015C code on my 2016 GMC Sierra?

Repairs may involve replacing the oxygen sensor, repairing exhaust leaks, cleaning carbon deposits, or fixing damaged wiring or connectors.

5. Can I drive my 2016 GMC Sierra with the P015C code?

While the vehicle may still be drivable, prolonged driving with this code can lead to decreased fuel efficiency and potential damage to the catalytic converter.

6. Which sensor is affected by the P015C code on a 2016 GMC Sierra?

The affected sensor is Bank 2 Sensor 1, which is the upstream oxygen sensor on the side of the engine that does not contain cylinder 1.

7. How do I diagnose the P015C code on a 2016 GMC Sierra?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the oxygen sensor and wiring for damage, checking for exhaust leaks, and testing the sensor's response time with a multimeter or scan tool.

8. Is a faulty oxygen sensor the only cause of the P015C code?

No, other possible causes include exhaust leaks, wiring or connector issues, and engine performance problems that affect the air-fuel ratio.

9. How much does it cost to repair the P015C code on a 2016 GMC Sierra?

Repair costs can vary. Replacing an oxygen sensor typically costs $100â€“$300, while fixing exhaust leaks or wiring issues may involve additional labor or parts.

10. How do I prevent the P015C code from returning on my 2016 GMC Sierra?

Regular maintenance, such as inspecting oxygen sensors, repairing exhaust leaks promptly, and using high-quality fuel to prevent carbon buildup, can help prevent this code from recurring.