AutoCodes – Chevrolet – P115F Chevrolet

P115F Chevrolet 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 Chevrolet 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 540

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P115F Chevrolet 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 Chevrolet - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P115F Chevrolet Code - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P115F Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the P115F Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P115F 2014 Chevrolet Silverado — O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1)
P115F 2015 Chevrolet Silverado — O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1)
P115F 2016 Chevrolet Silverado — O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1)
P115F 2017 Chevrolet Silverado — O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1)
P115F 2018 Chevrolet Silverado — O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1)

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 Chevrolet Code

1. What are the common symptoms of OBDII code P115F in a Chevrolet related to the O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1)?

Symptoms may include poor engine performance, decreased fuel efficiency, rough idling, and potential illumination of the check engine light.

2. What are some possible causes of OBDII code P115F in a Chevrolet indicating a low voltage issue with the O2 sensor?

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

3. How can I diagnose the O2 Reference Voltage Circuit Low Voltage issue (NOx Sensor 1) triggering code P115F in my Chevrolet?

Diagnosis typically involves visually inspecting the sensor and its wiring, testing the sensor's voltage output, checking for continuity in the wiring, and using a scan tool to monitor sensor data.

4. Is it safe to continue driving my Chevrolet with OBDII code P115F related to the O2 Reference Voltage Circuit Low Voltage issue?

It is recommended to address the issue promptly to prevent further damage to the vehicle and ensure optimal engine performance. Continuing to drive with this fault may lead to increased emissions and potential engine problems.

5. Can I repair the O2 Reference Voltage Circuit Low Voltage issue causing code P115F in my Chevrolet myself?

While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the root cause of this code may require advanced tools and expertise. It is advisable to consult a professional mechanic.

6. How much does it typically cost to repair OBDII code P115F in a Chevrolet associated with the O2 Reference Voltage Circuit Low Voltage problem?

Repair costs can vary depending on the exact cause of the issue, the extent of the repair needed, and labor rates in your area. It is best to obtain quotes from local mechanics or dealerships for an accurate estimate.

7. Can a faulty O2 sensor trigger multiple codes, including P115F for the O2 Reference Voltage Circuit Low Voltage in a Chevrolet?

Yes, a malfunctioning O2 sensor can lead to various related fault codes, including P115F. It is essential to address all relevant codes to ensure proper diagnosis and repair.

8. Are there any maintenance tips to prevent OBDII code P115F related to the O2 Reference Voltage Circuit Low Voltage issue in my Chevrolet?

Regularly inspecting and maintaining the O2 sensor and its wiring, following recommended service intervals, and promptly addressing any engine performance issues can help prevent this fault code.

9. Will resetting the check engine light temporarily resolve the OBDII code P115F in a Chevrolet linked to the O2 Reference Voltage Circuit Low Voltage problem?

Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return. It is crucial to diagnose and repair the root cause to prevent ongoing problems.

10. Can extreme weather conditions or environmental factors contribute to triggering OBDII code P115F in a Chevrolet due to the O2 Reference Voltage Circuit Low Voltage issue?

Harsh weather conditions, such as extreme cold or heat, can potentially affect sensor performance and lead to voltage-related faults. Ensuring proper insulation and protection for the sensor can help mitigate these effects.