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Engine-Codes – Chevrolet – P116C 2014 Chevrolet Silverado

P116C 2014 Chevrolet Silverado Code - O2 Signal Circuit High Voltage (NOx Sensor 1)

Quick Answer

The P116C diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected a high voltage signal from the NOx (Nitrogen Oxide) sensor 1, which is part of the vehicle's emissions control system. Common causes include Faulty NOx Sensor: The most common cause is a malfunctioning NOx sensor that is unable to provide accurate readings, Wiring Issues: Damaged or corroded wiring in the signal circuit can lead to high voltage readings, ECM Malfunction: A faulty engine control module may misinterpret sensor signals, resulting in erroneous high voltage codes. 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 Chevrolet Silverado indicates O2 Signal Circuit High Voltage (NOx Sensor 1).
Common causes
Common causes include Faulty NOx Sensor: The most common cause is a malfunctioning NOx sensor that is unable to provide accurate readings, Wiring Issues: Damaged or corroded wiring in the signal circuit can lead to high voltage readings, ECM Malfunction: A faulty engine control module may misinterpret sensor signals, resulting in erroneous high voltage codes.
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 Oct 21, 2024
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Code P116C 2014 Chevrolet Silverado Description

The P116C diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected a high voltage signal from the NOx (Nitrogen Oxide) sensor 1, which is part of the vehicle's emissions control system. The NOx sensor is critical for monitoring the levels of nitrogen oxides in the exhaust gases, which helps the engine management system optimize combustion and reduce harmful emissions.

OBDII Code P116C 2014 Chevrolet Silverado - O2 Signal Circuit High Voltage (NOx Sensor 1)
P116C 2014 Chevrolet Silverado Code - O2 Signal Circuit High Voltage (NOx Sensor 1)

Common Causes of P116C 2014 Chevrolet Silverado

  1. Faulty NOx Sensor: The most common cause is a malfunctioning NOx sensor that is unable to provide accurate readings.
  2. Wiring Issues: Damaged or corroded wiring in the signal circuit can lead to high voltage readings.
  3. ECM Malfunction: A faulty engine control module may misinterpret sensor signals, resulting in erroneous high voltage codes.
  4. Exhaust Leaks: Leaks in the exhaust system can introduce contaminants that affect sensor performance.
  5. Contaminated Sensor: The sensor may become contaminated with soot or other deposits, leading to incorrect readings.

Symptoms of P116C 2014 Chevrolet Silverado

  1. Check Engine Light: The most common symptom is the illumination of the check engine light on the dashboard.
  2. Poor Fuel Economy: Drivers may notice a decrease in fuel efficiency due to improper air-fuel mixture adjustments.
  3. Rough Idle or Stalling: The engine may exhibit rough idling or stalling, especially during acceleration or when the engine is cold.
  4. Increased Emissions: The vehicle may produce higher levels of harmful emissions, potentially leading to failed emissions tests.
  5. Loss of Power: There may be a noticeable loss of engine power, particularly during acceleration or under load.

How to Fix P116C 2014 Chevrolet Silverado

  1. Diagnostic Scan: Begin with a thorough diagnostic scan to confirm the P116C code and check for any related codes that may provide additional context.
  2. Visual Inspection: Conduct a visual inspection of the NOx sensor and its wiring harness for signs of damage, corrosion, or loose connections.
  3. Sensor Replacement: If the NOx sensor is determined to be faulty, replace it with a new, OEM-quality sensor to ensure accurate readings.
  4. Wiring Repair: If wiring issues are found, repair or replace damaged wires and connectors to restore proper signal transmission.
  5. ECM Reprogramming: In some cases, the ECM may need to be reprogrammed or updated to ensure it correctly interprets the signals from the NOx sensor.

Cost to Fix P116C 2014 Chevrolet Silverado

The cost to repair a P116C code can vary widely based on the specific issue identified. Typically, the cost for parts such as a NOx sensor ranges from $100 to $300. Labor costs can range from $80 to $150 per hour, depending on the shop's location and reputation. A straightforward sensor replacement may take about 1 to 2 hours, leading to a total repair cost estimate of approximately $200 to $600.

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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 Chevrolet Silverado Code

1. What does OBDII code P116C mean on a 2014 Chevrolet Silverado?

It indicates a high voltage issue in the O2 signal circuit of NOx Sensor 1, which monitors nitrogen oxide emissions.

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

Symptoms may include the check engine light turning on, reduced fuel efficiency, rough idling, or decreased engine performance.

3. What causes the P116C OBDII code to appear?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).

4. Can I drive my 2014 Silverado with a P116C code?

While the vehicle may still run, driving with this code can lead to further engine or emissions system damage and should be addressed promptly.

5. How do you diagnose the P116C code on a 2014 Chevrolet Silverado?

Diagnosis typically involves scanning for codes, visually inspecting the NOx sensor wiring and connectors, and testing the sensor’s voltage and resistance.

6. How much does it cost to fix a P116C code on a Silverado?

Repair costs vary but may range from $300 to $700 if the NOx sensor needs replacing, plus additional labor for diagnostics and repairs.

7. Can a faulty NOx sensor trigger other codes besides P116C?

Yes, a failing NOx sensor can trigger related codes such as P11DC, P2201, or P229F, depending on the issue.

8. Will replacing the NOx sensor always fix the P116C code?

Not always. If the issue lies in the wiring, connectors, or ECM, simply replacing the sensor won’t resolve the problem.

9. What tools are needed to troubleshoot the P116C code?

Tools like an OBDII scanner, multimeter, and wiring diagram for the NOx sensor circuit are typically required.

10. Is the P116C code covered under warranty for a 2014 Silverado?

It depends on the vehicle’s warranty status and whether the emissions system is still covered. Check with your dealership for details.

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