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AutoCodes – Chevrolet – P115E 2014 Chevrolet Silverado

P115E 2014 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 2014 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 259
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P115E 2014 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 2014 Chevrolet Silverado - O2 Reference Voltage Circuit (NOx Sensor 1) - AutoCodes.com
P115E 2014 Chevrolet Silverado Code - O2 Reference Voltage Circuit (NOx Sensor 1)
What does this mean?

What are the Possible Causes of the DTC P115E 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P115E 2014 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 2014 Chevrolet Silverado Code

1. What does the OBDII code P115E mean on a 2014 Chevrolet Silverado?

P115E refers to an issue with the O2 Reference Voltage Circuit in NOx Sensor 1, which monitors nitrogen oxide levels in the exhaust system.

2. What are the common symptoms of code P115E in a 2014 Chevrolet Silverado?

Symptoms may include an illuminated Check Engine Light, reduced fuel efficiency, poor engine performance, or the vehicle entering limp mode.

3. What causes the P115E code to appear on a 2014 Chevrolet Silverado?

Common causes include a faulty NOx Sensor 1, damaged wiring or connectors in the O2 reference voltage circuit, or issues with the engine control module (ECM).

4. Can I drive my 2014 Chevrolet Silverado with the P115E code active?

While the vehicle may still be drivable, continued operation with this code can lead to increased emissions and potential damage to the catalytic converter.

5. How do I diagnose the P115E code on a 2014 Chevrolet Silverado?

Start by inspecting the NOx sensor wiring and connectors for damage, then use a diagnostic scanner to monitor the sensor's reference voltage and compare it to manufacturer specifications.

6. How do I fix the P115E code on my 2014 Chevrolet Silverado?

Repairs may involve replacing the NOx Sensor 1, repairing damaged wiring or connectors, or updating/reprogramming the ECM if necessary.

7. How much does it cost to repair a P115E code on a 2014 Chevrolet Silverado?

Costs can range from $200 to $600, depending on whether the NOx sensor needs replacement or if wiring repairs are required.

8. Can a bad NOx sensor cause the P115E code on a 2014 Chevrolet Silverado?

Yes, a malfunctioning NOx Sensor 1 is a common cause of the P115E code.

9. Does the P115E code affect emissions on a 2014 Chevrolet Silverado?

Yes, the code indicates an issue with the NOx sensor, which can cause increased emissions and may lead to a failed emissions test.

10. Do I need to replace the NOx sensor to clear the P115E code on my 2014 Chevrolet Silverado?

Not always; the issue could be with the wiring or ECM. Proper diagnosis is necessary before replacing the NOx sensor.

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