AutoCodes – GMC – P115E GMC

P115E GMC 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 GMC 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 528

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P115E GMC 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 GMC - O2 Reference Voltage Circuit (NOx Sensor 1) - AutoCodes.com — P115E GMC Code - O2 Reference Voltage Circuit (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P115E GMC?

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 GMC?

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 GMC 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 GMC code?

Need more information on how to fix the P115E GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P115E GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P115E 2014 GMC Sierra — O2 Reference Voltage Circuit (NOx Sensor 1)
P115E 2015 GMC Sierra — O2 Reference Voltage Circuit (NOx Sensor 1)
P115E 2016 GMC Sierra — O2 Reference Voltage Circuit (NOx Sensor 1)
P115E 2017 GMC Sierra — O2 Reference Voltage Circuit (NOx Sensor 1)
P115E 2018 GMC Sierra — O2 Reference Voltage Circuit (NOx Sensor 1)

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 GMC Code

1. What are the common symptoms of OBDII code P115E in a GMC vehicle?

- Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What does the O2 Reference Voltage Circuit (NOx Sensor 1) error code P115E in a GMC indicate?

- This code indicates a problem with the O2 sensor reference voltage circuit for NOx sensor 1 in the vehicle.

3. What are the possible causes of the P115E OBDII code in a GMC related to the O2 Reference Voltage Circuit?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors, a defective PCM, or issues with the O2 sensor heater circuit.

4. How can I diagnose the O2 Reference Voltage Circuit issue causing the P115E code in my GMC?

- Diagnosis typically involves using a diagnostic scanner to read the trouble codes, checking the NOx sensor and related wiring for damage, and testing the sensor's voltage and resistance.

5. Can I continue driving my GMC with the P115E code for the O2 Reference Voltage Circuit issue?

- It is not recommended to continue driving with this code present, as it can lead to poor engine performance and potentially cause further damage to the vehicle.

6. Are there any simple repairs or maintenance tasks I can perform to resolve the P115E OBDII code on my GMC?

- Simple tasks include checking and cleaning the sensor connectors, inspecting the wiring for damage, and ensuring proper grounding of the sensor.

7. Is it necessary to replace the NOx sensor when dealing with the P115E code in a GMC?

- In many cases, replacing the NOx sensor is necessary to resolve the P115E code and restore proper engine performance.

8. How much does it typically cost to repair the O2 Reference Voltage Circuit issue causing the P115E code in a GMC?

- Repair costs can vary depending on the exact cause of the issue, but they may range from $200 to $500, including parts and labor.

9. Can a DIY enthusiast with basic mechanical skills fix the P115E code related to the O2 Reference Voltage Circuit in a GMC?

- While some basic tasks can be performed by DIY enthusiasts, diagnosing and repairing complex electrical issues like this code may require professional expertise.

10. How long does it usually take to repair the O2 Reference Voltage Circuit problem causing the P115E code in a GMC?

- Repair times can vary based on the extent of the issue and the availability of parts, but it typically takes a few hours to a full day to address this problem effectively.