AutoCodes – Chevrolet – P115E 2018 Chevrolet Silverado

P115E 2018 Chevrolet Silverado Code - O2 Reference Voltage Circuit (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: P115E 2018 Chevrolet Silverado indicates O2 Reference Voltage Circuit (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 475

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 P115E 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 the 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 P115E 2018 Chevrolet Silverado - O2 Reference Voltage Circuit (NOx Sensor 1) - AutoCodes.com — P115E 2018 Chevrolet Silverado Code - O2 Reference Voltage Circuit (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P115E 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 P115E 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 P115E 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 P115E 2018 Chevrolet Silverado code?

Need more information on how to fix the P115E 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 P115E 2018 Chevrolet Silverado Code

1. What does OBDII code P115E (O2 Reference Voltage Circuit - NOx Sensor 1) indicate in a 2018 Chevrolet Silverado?

This code indicates a problem with the oxygen sensor reference voltage circuit for the NOx sensor 1 in the exhaust system.

2. What are the common symptoms of OBDII code P115E in a 2018 Chevrolet Silverado?

Common symptoms include reduced fuel efficiency, engine misfires, rough idling, and potentially an illuminated check engine light.

3. What are the possible causes of OBDII code P115E in a 2018 Chevrolet Silverado?

Possible causes include a faulty NOx sensor, damaged wiring or connectors in the reference voltage circuit, or issues with the engine control module.

4. How can I diagnose OBDII code P115E in my 2018 Chevrolet Silverado?

Diagnosis typically involves using a scan tool to retrieve the specific fault code, inspecting the wiring and connectors related to the NOx sensor 1, and testing the sensor itself for proper function.

5. Is it safe to continue driving with OBDII code P115E present in a 2018 Chevrolet Silverado?

It is not recommended to drive with this code present, as it can lead to decreased engine performance and potential long-term engine damage if left unresolved.

6. Can I repair OBDII code P115E in my 2018 Chevrolet Silverado myself?

Simple fixes like checking and tightening connections or replacing damaged wiring may be within reach for DIY enthusiasts, but more complex issues may require professional diagnosis and repair.

7. How much does it typically cost to repair OBDII code P115E in a 2018 Chevrolet Silverado?

Costs can vary depending on the exact cause of the code, but repairs for this issue may range from $100 to $500 or more, including parts and labor.

8. Are there any preventive measures to avoid OBDII code P115E in a 2018 Chevrolet Silverado?

Regular vehicle maintenance, including checking and replacing oxygen sensors as recommended by the manufacturer, can help prevent issues leading to this fault code.

9. Can OBDII code P115E in a 2018 Chevrolet Silverado cause emissions test failures?

Yes, this code can affect the emissions output of the vehicle, potentially leading to a failed emissions test until the underlying issue is resolved.

10. How urgent is it to address OBDII code P115E in a 2018 Chevrolet Silverado?

While the vehicle may still be operable with this code present, it's best to address the issue promptly to prevent further damage and ensure optimal engine performance.