AutoCodes.com
Login with Google
AutoCodes – GMC – P115F 2016 GMC Sierra

P115F 2016 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 2016 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.
Save to My Repairs My Repairs
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 153
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 24, 2024
💬 Need more help? Ask Coddy for instant answers — it's free!

Code P115F 2016 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 2016 GMC Sierra - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com
P115F 2016 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 2016 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 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P115F 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.

Need more information about the P115F 2016 GMC Sierra code?

Need more information on how to fix the P115F 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P115F 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2016 GMC Sierra Code

What does OBDII code P115F mean on a 2016 GMC Sierra?

Code P115F indicates an issue with the O2 Reference Voltage Circuit Low Voltage for NOx Sensor 1, meaning the sensor is reporting a voltage lower than expected.

What are the symptoms of code P115F on a 2016 GMC Sierra?

Symptoms may include reduced engine performance, increased emissions, poor fuel economy, and the illumination of the check engine light.

What causes the P115F code to appear?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the O2 reference voltage circuit, or a malfunctioning ECM.

Can I drive my 2016 GMC Sierra with the P115F code active?

While driving with this code may be possible, it is not recommended as it can lead to increased emissions, poor engine performance, and potential damage to the catalytic converter.

How do I diagnose the P115F code on my 2016 GMC Sierra?

Start by inspecting the NOx sensor wiring and connectors for damage or corrosion, then use a scan tool to check live sensor data and test the reference voltage circuit.

How much does it cost to fix the P115F code on a 2016 GMC Sierra?

Repair costs can range from $150 to $600 depending on whether the issue is with the sensor, wiring, or ECM.

Can a bad NOx sensor cause the P115F code on a 2016 GMC Sierra?

Yes, a malfunctioning or failing NOx sensor is one of the most common causes of the P115F code.

Does the P115F code affect fuel efficiency on a 2016 GMC Sierra?

Yes, the code can lead to poor fuel economy due to incorrect air-fuel mixture adjustments by the ECM.

What tools are needed to fix the P115F code on a 2016 GMC Sierra?

You may need a scan tool for diagnostics, a multimeter to test the circuit, and standard hand tools for sensor or wiring repairs.

Should I replace the NOx sensor to fix the P115F code on my 2016 GMC Sierra?

Not necessarily. The sensor should only be replaced after confirming it is faulty through proper diagnostics. Check wiring and voltage first.

Discuss the causes and fixes for P115F 2016 GMC Sierra OBDII Code

Submit a New Comment

Code P115F 2016 GMC Sierra comments

No comments found for this page.

AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play