AutoCodes – Chevrolet – P115F 2018 Chevrolet Silverado

P115F 2018 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 2018 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 227

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 2018 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 2018 Chevrolet Silverado - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P115F 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P115F 2018 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 2018 Chevrolet Silverado Code

1. What does the OBDII code P115F mean for a 2018 Chevrolet Silverado?

P115F indicates an issue with the O2 Reference Voltage Circuit Low Voltage in NOx Sensor 1, typically related to the sensor monitoring nitrogen oxide levels in the exhaust.

2. What are the common symptoms of code P115F on a 2018 Chevrolet Silverado?

Symptoms may include reduced engine performance, poor fuel economy, a lit check engine light, and increased emissions.

3. What causes the P115F code on a 2018 Chevrolet Silverado?

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

4. How do I diagnose the P115F code on my 2018 Chevrolet Silverado?

Start by checking the wiring and connectors for damage or corrosion, inspect the NOx sensor for faults, and verify the reference voltage using a multimeter.

5. Can I drive my 2018 Chevrolet Silverado with the P115F code?

Itâ€™s not recommended to drive for an extended period with this code, as it may lead to reduced engine performance and higher emissions.

6. What is the role of NOx Sensor 1 in the 2018 Chevrolet Silverado?

NOx Sensor 1 monitors nitrogen oxide levels in the exhaust system to help the ECM optimize combustion and emissions control.

7. How do I fix the P115F code on a 2018 Chevrolet Silverado?

Repairs may involve replacing the faulty NOx sensor, repairing damaged wiring, or reprogramming or replacing the ECM if necessary.

8. How much does it cost to fix the P115F code on a 2018 Chevrolet Silverado?

Costs vary but replacing a NOx sensor typically ranges from $300 to $700, including parts and labor.

9. Can a dirty or clogged exhaust system cause the P115F code?

While not a primary cause, a clogged exhaust system can affect sensor readings and may contribute to triggering this code.

10. Will clearing the P115F code without repairs fix the problem?

Clearing the code without addressing the underlying issue will only temporarily turn off the check engine light, as the code will return once the problem persists.