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Engine-Codes – GMC – P115E 2014 GMC Sierra

P115E 2014 GMC Sierra Code - O2 Reference Voltage Circuit (NOx Sensor 1)

Quick Answer

The P115E diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to the O2 reference voltage circuit for NOx sensor 1. Common causes include Wiring harness damage or corrosion, Faulty NOx sensor, Malfunctioning ECM. 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 GMC Sierra indicates O2 Reference Voltage Circuit (NOx Sensor 1).
Common causes
Common causes include Wiring harness damage or corrosion, Faulty NOx sensor, Malfunctioning ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code P115E 2014 GMC Sierra Description

The P115E diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to the O2 reference voltage circuit for NOx sensor 1. This code indicates that there is an issue with the oxygen sensor's reference voltage circuit, specifically for the NOx (nitrogen oxide) sensor 1. The NOx sensor plays a crucial role in monitoring and controlling the levels of nitrogen oxide emissions from the vehicle's exhaust system. The reference voltage circuit provides the necessary voltage for the sensor to function properly and send accurate data to the engine control module (ECM).

OBDII Code P115E 2014 GMC Sierra - O2 Reference Voltage Circuit (NOx Sensor 1)
P115E 2014 GMC Sierra Code - O2 Reference Voltage Circuit (NOx Sensor 1)

Common Causes of P115E 2014 GMC Sierra

  1. Wiring harness damage or corrosion
  2. Faulty NOx sensor
  3. Malfunctioning ECM
  4. Issues with the reference voltage circuit
  5. Poor electrical connections

Symptoms of P115E 2014 GMC Sierra

  1. Decreased fuel efficiency
  2. Rough idling
  3. Hesitation during acceleration
  4. Engine misfires
  5. Failed emissions tests

How to Fix P115E 2014 GMC Sierra

  1. Diagnose the issue using a scan tool to retrieve the specific DTC and perform voltage tests on the NOx sensor.
  2. Inspect the wiring harness for any damage or corrosion, repairing or replacing as needed.
  3. Test the NOx sensor for proper function and replace if faulty.
  4. Check the ECM for any malfunctions and reprogram or replace if necessary.
  5. Verify proper operation of the reference voltage circuit and repair any issues found.

Cost to Fix P115E 2014 GMC Sierra

The typical repair costs for addressing the P115E code on a 2014 GMC Sierra can range from $200 to $600, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower prices. For a more accurate estimate, it's recommended to consult with local auto repair shops.

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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 GMC Sierra Code

1. What does the OBDII code P115E mean for a 2014 GMC Sierra?

The code P115E indicates an issue with the O2 Reference Voltage Circuit in NOx Sensor 1, which monitors nitrogen oxide emissions in the exhaust system.

2. What are the common symptoms of code P115E in a GMC Sierra?

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

3. What causes code P115E in a 2014 GMC Sierra?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the O2 Reference Voltage Circuit, or an issue with the vehicle’s ECU.

4. Can driving with code P115E damage my GMC Sierra?

Driving with this code can lead to increased emissions and potential damage to the exhaust system or catalytic converter over time.

5. How do you diagnose code P115E in a GMC Sierra?

Diagnosis involves using an OBDII scanner, inspecting the NOx sensor and related wiring, and checking for voltage irregularities in the circuit.

6. How can you fix code P115E in a 2014 GMC Sierra?

Repairs may include replacing the NOx sensor, repairing or replacing damaged wiring, and ensuring proper connections in the circuit.

7. How much does it cost to fix code P115E in a GMC Sierra?

The repair cost depends on the issue, but replacing a NOx sensor typically costs $300-$500, including parts and labor.

8. Can a faulty NOx sensor trigger code P115E?

Yes, a malfunctioning NOx sensor is one of the most common causes of this code.

9. Is code P115E specific to GMC vehicles?

No, this code can appear in other vehicles with similar NOx sensor systems, but the specifics may vary by manufacturer and model.

10. Can I reset code P115E without fixing the issue?

You can clear the code with an OBDII scanner, but it will likely return if the underlying problem is not addressed.

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