AutoCodes – GMC – P116C 2014 GMC Sierra

P116C 2014 GMC Sierra Code - O2 Signal Circuit High Voltage (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: P116C 2014 GMC Sierra indicates O2 Signal Circuit High Voltage (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 140

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 P116C 2014 GMC Sierra 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 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 P116C 2014 GMC Sierra - O2 Signal Circuit High Voltage (NOx Sensor 1) - AutoCodes.com — P116C 2014 GMC Sierra Code - O2 Signal Circuit High Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P116C 2014 GMC Sierra?

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 P116C 2014 GMC Sierra?

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 P116C 2014 GMC Sierra 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 P116C 2014 GMC Sierra 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 P116C 2014 GMC Sierra Code

1. What does the OBDII code P116C mean on a 2014 GMC Sierra?

P116C indicates a high voltage issue in the oxygen (O2) signal circuit of NOx Sensor 1, which monitors nitrogen oxide levels in the exhaust system for emissions control.

2. What are the common symptoms of code P116C in a 2014 GMC Sierra?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, poor engine performance, and possible emissions test failure.

3. What causes the P116C code to appear on a 2014 GMC Sierra?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the O2 signal circuit, a malfunctioning engine control module (ECM), or excessive soot buildup on the sensor.

4. How do I diagnose the P116C code on my 2014 GMC Sierra?

Start by inspecting the NOx sensor and its wiring for damage or corrosion. Use a scan tool to monitor sensor voltages and confirm if the signal is out of range.

5. Can I drive my 2014 GMC Sierra with a P116C code?

While the vehicle may still be drivable, it is not recommended to ignore the issue as it can lead to increased emissions, poor performance, and potential damage to other components.

6. How do I fix the P116C code on my 2014 GMC Sierra?

Repairs may include replacing the NOx sensor, repairing or replacing damaged wiring or connectors, cleaning the sensor, or updating/reprogramming the ECM.

7. How much does it cost to repair a P116C code on a 2014 GMC Sierra?

The repair cost can vary, but replacing a NOx sensor typically ranges from $300 to $700, depending on labor rates and parts pricing.

8. Can a dirty or clogged NOx sensor cause the P116C code?

Yes, soot buildup or contamination on the NOx sensor can interfere with its signal, causing high voltage readings and triggering the P116C code.

9. Is it necessary to replace the NOx sensor to fix the P116C code?

Not always. If the issue is caused by damaged wiring or a loose connector, repairing those components may resolve the code without replacing the sensor.

10. How can I prevent the P116C code from recurring on my 2014 GMC Sierra?

Regularly maintain the exhaust system, use high-quality fuel, and address any engine performance issues promptly to prevent damage to the NOx sensor and related components.