AutoCodes – GMC – P115F 2017 GMC Sierra

P115F 2017 GMC Sierra Code - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1)

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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: P115F 2017 GMC Sierra indicates O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1).
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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 309

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 Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P115F 2017 GMC Sierra Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.

OBDII Code P115F 2017 GMC Sierra - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P115F 2017 GMC Sierra Code - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P115F 2017 GMC Sierra?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P115F 2017 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P115F 2017 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.

Need more information about the P115F 2017 GMC Sierra code?

Need more information on how to fix the P115F 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P115F 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P115F in a 2017 GMC Sierra?

The common symptoms of OBDII code P115F in a 2017 GMC Sierra may include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1) code P115F indicate in a 2017 GMC Sierra?

The P115F code indicates that there is a low voltage condition detected in the O2 reference voltage circuit of the NOx Sensor 1 in a 2017 GMC Sierra.

3. What are the possible causes of OBDII code P115F in a 2017 GMC Sierra?

Possible causes of code P115F in a 2017 GMC Sierra include a faulty NOx sensor, damaged wiring or connectors in the O2 reference voltage circuit, or issues with the vehicle's engine control module.

4. How can I diagnose the O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1) code P115F in my 2017 GMC Sierra?

Diagnosing code P115F involves using an OBDII scanner to retrieve the specific fault code, inspecting the NOx sensor and its wiring for any visible damage, and testing the voltage levels in the O2 reference voltage circuit.

5. Can I continue driving my 2017 GMC Sierra with OBDII code P115F?

It is not recommended to continue driving your 2017 GMC Sierra with code P115F as it can lead to further engine damage and potentially worsen fuel efficiency. It is best to address the issue promptly.

6. How can I repair OBDII code P115F in my 2017 GMC Sierra?

Repairing code P115F may involve replacing the NOx sensor, repairing or replacing damaged wiring or connectors in the O2 reference voltage circuit, and clearing the fault code with an OBDII scanner.

7. Is it possible to reset the check engine light after fixing OBDII code P115F in a 2017 GMC Sierra?

Yes, after addressing the underlying issue causing code P115F in your 2017 GMC Sierra, you can reset the check engine light using an OBDII scanner to clear the stored fault code.

8. What should I do if the check engine light continues to illuminate after repairing OBDII code P115F in my 2017 GMC Sierra?

If the check engine light persists after repairing code P115F, it is recommended to recheck the NOx sensor, wiring, and connections to ensure all components are functioning properly.

9. Can a DIY enthusiast fix OBDII code P115F in a 2017 GMC Sierra?

While some aspects of diagnosing and repairing code P115F may be within reach of a DIY enthusiast, dealing with intricate electrical components like the NOx sensor and wiring may require professional expertise to ensure proper repair.

10. How often does OBDII code P115F occur in a 2017 GMC Sierra?

The occurrence of code P115F in a 2017 GMC Sierra can vary depending on driving conditions, maintenance history, and other factors. If the code appears, it should be addressed promptly to prevent potential issues.