AutoCodes – Chevrolet – P116C 2018 Chevrolet Silverado

P116C 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 272

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 2018 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 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 2018 Chevrolet Silverado - O2 Signal Circuit High Voltage (NOx Sensor 1) - AutoCodes.com — P116C 2018 Chevrolet Silverado Code - O2 Signal Circuit High Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P116C 2018 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 P116C 2018 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 P116C 2018 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 P116C 2018 Chevrolet Silverado code?

Need more information on how to fix the P116C 2018 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 P116C 2018 Chevrolet Silverado Code

1. What does the OBDII code P116C mean on a 2018 Chevrolet Silverado?

P116C indicates that the NOx sensor 1 has detected a high voltage condition in the oxygen (O2) signal circuit, which typically monitors nitrogen oxide emissions.

2. What are the common symptoms of code P116C on a 2018 Chevrolet Silverado?

You may notice the check engine light, reduced fuel efficiency, rough idling, or decreased engine performance.

3. What causes the P116C code to appear on a 2018 Chevrolet Silverado?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the O2 signal circuit, or issues with the vehicle's exhaust or emissions system.

4. Can a dirty NOx sensor cause the P116C code?

Yes, a dirty or contaminated NOx sensor can cause incorrect readings and trigger the P116C code.

5. How do you diagnose the P116C code on a 2018 Chevrolet Silverado?

Start by scanning the vehicle with an OBDII tool, inspecting the NOx sensor and its wiring for damage, and checking the exhaust system for leaks or blockages.

6. Is it safe to drive with the P116C code on a 2018 Chevrolet Silverado?

Driving is possible but not recommended, as it can lead to reduced performance, higher emissions, and potential damage to the emissions system.

7. How do you fix the P116C code on a 2018 Chevrolet Silverado?

Repairs typically involve replacing the faulty NOx sensor, repairing damaged wiring, or addressing exhaust system issues.

8. How much does it cost to repair the P116C code on a 2018 Chevrolet Silverado?

Replacing a NOx sensor can range from $300 to $700, depending on labor costs and sensor prices.

9. Can a software update fix the P116C code on a 2018 Chevrolet Silverado?

In some cases, a reflash or update of the vehicle's engine control module (ECM) may resolve the issue if it's related to software errors.

10. How can you prevent the P116C code from reoccurring?

Regular maintenance of the exhaust and emissions system, using high-quality fuel, and promptly addressing check engine light warnings can help prevent recurrence.