AutoCodes – GMC – P115F 2014 GMC Sierra

P115F 2014 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 2014 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 175

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2014 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 2014 GMC Sierra - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P115F 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra code?

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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 2014 GMC Sierra Code

What does OBDII code P115F mean for a 2014 GMC Sierra?

OBDII code P115F indicates that the oxygen (O2) reference voltage circuit for NOx Sensor 1 is experiencing low voltage, which can affect the sensor's performance and emissions control.

What are common symptoms of the P115F code?

Common symptoms include poor engine performance, increased fuel consumption, rough idling, and the check engine light illuminating on the dashboard.

What causes the P115F code to trigger?

Causes can include a faulty NOx sensor, damaged wiring or connectors in the O2 reference voltage circuit, or issues with the engine control module (ECM).

Can I drive my GMC Sierra with the P115F code?

While it is possible to drive with this code, it is not recommended as it can lead to decreased fuel efficiency and increased emissions, and it may cause further damage to the vehicle.

How can I diagnose the P115F code?

You can diagnose the code by using an OBDII scanner to confirm the code, then visually inspecting the NOx sensor and wiring for damage. Testing the voltage levels and ensuring proper connections is also essential.

What are some common repairs for the P115F code?

Common repairs include replacing a faulty NOx sensor, repairing or replacing damaged wiring and connectors, and reprogramming or replacing the ECM if it is determined to be defective.

Is it safe to ignore the P115F code?

Ignoring the P115F code is not safe as it can lead to increased emissions, potential engine damage, and failing emissions tests.

How much does it typically cost to fix the P115F code?

Repair costs can vary widely depending on the cause, but replacing a NOx sensor can range from $150 to $500, including parts and labor.

Will clearing the code fix the problem?

Clearing the code may turn off the check engine light temporarily, but if the underlying issue is not resolved, the code will likely reappear.

How often does the P115F code occur in the GMC Sierra?

The frequency of the P115F code can vary, but it is commonly seen in vehicles with high mileage or those exposed to harsh driving conditions, which can lead to sensor wear or wiring issues.