AutoCodes – Chevrolet – P115F 2015 Chevrolet Silverado

P115F 2015 Chevrolet Silverado 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 Chevrolet Silverado 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 290

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 2015 Chevrolet Silverado 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 Chevrolet Silverado - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P115F 2015 Chevrolet Silverado Code - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P115F 2015 Chevrolet Silverado?

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 Chevrolet Silverado?

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 Chevrolet Silverado 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 Chevrolet Silverado code?

Need more information on how to fix the P115F 2015 Chevrolet Silverado 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 Chevrolet Silverado Code

What does the OBDII code P115F mean on a 2015 Chevrolet Silverado?

P115F indicates "O2 Reference Voltage Circuit Low Voltage" for NOx Sensor 1, meaning the sensor is detecting an unusually low reference voltage in the circuit.

What are the symptoms of a P115F code in a 2015 Chevrolet Silverado?

Common symptoms include the check engine light turning on, reduced fuel efficiency, possible power loss, and issues with emissions performance.

What causes the P115F code to appear on a 2015 Chevrolet Silverado?

Potential causes include a faulty NOx sensor, damaged wiring or connectors in the NOx sensor circuit, a failing ECM, or corrosion in the electrical connections.

How do I diagnose the P115F code on my 2015 Chevrolet Silverado?

Start by inspecting the NOx sensor and its wiring for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit. A scan tool can also help verify sensor performance.

Can I drive my 2015 Chevrolet Silverado with a P115F code?

While the truck may still be drivable, it is not recommended as it can lead to poor fuel efficiency, potential damage to the emissions system, and failure to meet emissions standards.

How do I fix the P115F code on a 2015 Chevrolet Silverado?

Repairs may include replacing the defective NOx sensor, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming the ECM if necessary.

How much does it cost to repair a P115F code on a 2015 Chevrolet Silverado?

The cost of repairs can range from $200 to $600 or more, depending on whether the NOx sensor needs replacement or if additional wiring or ECM repairs are required.

Can a bad NOx sensor cause other problems in a 2015 Chevrolet Silverado?

Yes, a faulty NOx sensor can lead to excessive emissions, reduced fuel efficiency, and potential damage to other components in the emissions control system.

What tools are needed to troubleshoot the P115F code on a 2015 Chevrolet Silverado?

Youâ€™ll need a diagnostic scan tool, a multimeter, and possibly a wiring diagram for the NOx sensor circuit to properly troubleshoot and identify the issue.

Does the P115F code always mean the NOx sensor is bad?

No, while the NOx sensor is a common culprit, the issue could also stem from wiring problems, corroded connectors, or even a malfunctioning ECM.