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AutoCodes – Chevrolet – P116B 2018 Chevrolet Silverado

P116B 2018 Chevrolet Silverado Code - O2 Signal Circuit Low 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
P116B 2018 Chevrolet Silverado indicates O2 Signal Circuit Low 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 329
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P116B 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 P116B 2018 Chevrolet Silverado - O2 Signal Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com
P116B 2018 Chevrolet Silverado Code - O2 Signal Circuit Low Voltage (NOx Sensor 1)
What does this mean?

What are the Possible Causes of the DTC P116B 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 P116B 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 P116B 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 P116B 2018 Chevrolet Silverado code?

Need more information on how to fix the P116B 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 P116B 2018 Chevrolet Silverado Code

What does the OBDII code P116B mean for a 2018 Chevrolet Silverado?

The P116B code indicates a low voltage issue in the O2 signal circuit of NOx Sensor 1, which monitors nitrogen oxide emissions.

What are the symptoms of the P116B code in a 2018 Chevrolet Silverado?

Common symptoms include an illuminated check engine light, reduced fuel efficiency, poor engine performance, and possibly a failed emissions test.

What causes the P116B code to appear in a 2018 Chevrolet Silverado?

Causes may include a faulty NOx sensor, damaged wiring or connectors in the O2 signal circuit, or issues with the vehicle’s ECM.

Can I drive my 2018 Chevrolet Silverado with the P116B code?

While the vehicle may still be drivable, it’s not recommended as it could lead to reduced performance, higher emissions, or potential damage to other components.

How do I diagnose the P116B code on a 2018 Chevrolet Silverado?

Start by using an OBDII scanner to confirm the code, then inspect the NOx sensor, wiring, and connectors for damage or corrosion, and test the sensor's voltage output.

How is the P116B code fixed in a 2018 Chevrolet Silverado?

Repairs may involve replacing a faulty NOx sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if needed.

How much does it cost to repair the P116B code on a 2018 Chevrolet Silverado?

Repair costs can range from $200 to $800, depending on whether the NOx sensor, wiring, or ECM needs to be repaired or replaced.

Can a dirty or clogged exhaust system cause the P116B code?

Yes, a clogged exhaust system can affect sensor readings and potentially trigger the P116B code, though it is less common.

Does the P116B code affect fuel economy in a 2018 Chevrolet Silverado?

Yes, a malfunctioning NOx sensor can cause the engine to run inefficiently, leading to reduced fuel economy.

Should the NOx sensor be replaced immediately if the P116B code is present?

Not necessarily; the sensor should be tested to confirm it’s faulty before replacement, as the issue could also stem from wiring or the ECM.

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