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AutoCodes – Chevrolet – P115E 2017 Chevrolet Silverado

P115E 2017 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 2017 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 307
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P115E 2017 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 2017 Chevrolet Silverado - O2 Reference Voltage Circuit (NOx Sensor 1) - AutoCodes.com
P115E 2017 Chevrolet Silverado Code - O2 Reference Voltage Circuit (NOx Sensor 1)
What does this mean?

What are the Possible Causes of the DTC P115E 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P115E 2017 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 2017 Chevrolet Silverado Code

1. What does the OBDII code P115E mean on a 2017 Chevrolet Silverado?

P115E refers to an issue with the O2 Reference Voltage Circuit for NOx Sensor 1, indicating a potential problem with the sensor's ability to measure nitrogen oxide levels accurately.

2. What are the common symptoms of code P115E on a 2017 Silverado?

Symptoms may include the check engine light turning on, reduced engine performance, poor fuel efficiency, and increased emissions.

3. What causes the P115E code to appear on a 2017 Chevrolet Silverado?

The most common causes are a faulty NOx sensor, wiring or connector issues in the O2 reference circuit, or a malfunctioning powertrain control module (PCM).

4. Can a bad NOx sensor trigger the P115E code on a Chevy Silverado?

Yes, a defective NOx sensor is a primary cause of the P115E code and should be inspected or tested during diagnosis.

5. How do I diagnose the P115E code on my 2017 Chevrolet Silverado?

Use a scan tool to confirm the code, visually inspect the wiring and connectors for damage or corrosion, and test the NOx sensor's operation with a multimeter or specialized diagnostic equipment.

6. Can I drive my 2017 Silverado with a P115E code?

Driving is possible but not recommended, as the vehicle may experience reduced performance, higher emissions, and potential damage to other components if left unresolved.

7. How do I fix the P115E code on a 2017 Chevrolet Silverado?

Repairs may include replacing the NOx sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

8. How much does it cost to fix the P115E code on a Chevy Silverado?

Repair costs can range from $200 to $600 or more, depending on whether the NOx sensor, wiring, or PCM requires replacement.

9. Can a software update fix the P115E code on my 2017 Silverado?

In some cases, a PCM software update provided by the manufacturer may resolve the issue if it’s related to incorrect calibration or programming.

10. Is it necessary to replace both NOx sensors if one triggers the P115E code?

Not necessarily. Only the faulty NOx sensor (Sensor 1 in this case) needs replacement unless the second sensor is also showing signs of failure.

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