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AutoCodes – Chevrolet – P116D 2018 Chevrolet Silverado

P116D 2018 Chevrolet Silverado Code - O2 Pump Current Control 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
P116D 2018 Chevrolet Silverado indicates O2 Pump Current Control 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.
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Code Popularity 302
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P116D 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 P116D 2018 Chevrolet Silverado - O2 Pump Current Control Circuit (NOx Sensor 1) - AutoCodes.com
P116D 2018 Chevrolet Silverado Code - O2 Pump Current Control Circuit (NOx Sensor 1)
What does this mean?

What are the Possible Causes of the DTC P116D 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 P116D 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 P116D 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 P116D 2018 Chevrolet Silverado code?

Need more information on how to fix the P116D 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 P116D 2018 Chevrolet Silverado Code

1. What does the OBDII code P116D mean on a 2018 Chevrolet Silverado?

P116D indicates an issue with the O2 Pump Current Control Circuit in NOx Sensor 1, which monitors and controls oxygen levels in the exhaust for emissions compliance.

2. What are the common symptoms of code P116D in a 2018 Chevrolet Silverado?

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

3. What causes the P116D code to appear on my 2018 Chevrolet Silverado?

Common causes include a faulty NOx Sensor 1, damaged wiring or connectors in the O2 pump circuit, or an issue with the engine control module (ECM).

4. Can I still drive my 2018 Silverado with a P116D code?

While the truck may still run, driving with this code can lead to reduced performance, higher emissions, and potential long-term damage to the catalytic converter.

5. How do I diagnose the P116D code in my Silverado?

Diagnosis involves checking the NOx sensor's wiring and connectors for damage, testing the sensor with a multimeter, and verifying the ECM is receiving proper signals.

6. How much does it cost to fix the P116D code on a 2018 Chevrolet Silverado?

Repair costs vary, but replacing the NOx sensor can cost between $300 and $800, depending on parts and labor.

7. Can a faulty NOx sensor cause other problems in my Silverado?

Yes, a faulty NOx sensor can lead to increased emissions, reduced fuel efficiency, and potential damage to the exhaust system.

8. How do I reset the P116D code after repairs?

You can use an OBDII scanner to clear the code, but ensure the issue is fully resolved to prevent the code from returning.

9. Is the P116D code covered under warranty for a 2018 Chevrolet Silverado?

It depends on your warranty terms. Emissions-related components like the NOx sensor may be covered under the emissions warranty.

10. How can I prevent the P116D code from recurring?

Regular maintenance, inspecting wiring for damage, and using high-quality fuel can help prevent issues with the NOx sensor and its circuit.

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