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P115F 2015 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 2015 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 171
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P115F 2015 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 2015 GMC Sierra - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com
P115F 2015 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 2015 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 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P115F 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.

Need more information about the P115F 2015 GMC Sierra code?

Need more information on how to fix the P115F 2015 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 2015 GMC Sierra Code

1. What does the OBDII code P115F on a 2015 GMC Sierra mean?

P115F refers to an issue with the O2 reference voltage circuit, indicating low voltage in the NOx Sensor 1, which monitors nitrogen oxide levels in the exhaust system.

2. What are the common symptoms of the P115F code on a 2015 GMC Sierra?

Symptoms may include a check engine light, reduced fuel efficiency, poor engine performance, and emissions test failure.

3. What causes the P115F code in a 2015 GMC Sierra?

Common causes include a faulty NOx sensor, wiring issues such as damaged or corroded connections, or a problem with the ECM (engine control module).

4. Can a bad NOx sensor trigger the P115F code on a 2015 GMC Sierra?

Yes, a malfunctioning or damaged NOx sensor is one of the primary reasons for the P115F code.

5. How do you diagnose the P115F code on a 2015 GMC Sierra?

Diagnosis includes scanning for codes, inspecting the NOx sensor and related wiring for damage, and testing the reference voltage circuit for proper operation.

6. How can the P115F code affect engine performance on a 2015 GMC Sierra?

This code can lead to incorrect air-fuel ratio adjustments, reducing engine efficiency and potentially causing rough idling or hesitation.

7. Is it safe to drive a 2015 GMC Sierra with the P115F code?

While the vehicle may still be drivable, ignoring the code can lead to decreased performance and higher emissions, potentially damaging other components over time.

8. What are the most common fixes for the P115F code on a 2015 GMC Sierra?

The most common fixes include replacing the NOx sensor, repairing or replacing damaged wiring, and updating or reprogramming the ECM if needed.

9. How much does it typically cost to repair the P115F code on a 2015 GMC Sierra?

Repair costs can vary, but replacing a NOx sensor typically ranges from $300 to $700, depending on parts and labor.

10. Can a software update resolve the P115F code on a 2015 GMC Sierra?

In some cases, an ECM software update may resolve the issue if the code is caused by incorrect programming or calibration.

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