AutoCodes – Chevrolet – P116B 2015 Chevrolet Silverado

P116B 2015 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 2015 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 1,228

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
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Code P116B 2015 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 2015 Chevrolet Silverado - O2 Signal Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P116B 2015 Chevrolet Silverado Code - O2 Signal Circuit Low Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P116B 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the P116B 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2015 Chevrolet Silverado Code

What does OBDII code P116B mean for a 2015 Chevrolet Silverado?

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

What are the symptoms of code P116B in a 2015 Chevrolet Silverado?

Common symptoms include reduced fuel efficiency, increased emissions, possible engine hesitation, and the check engine light turning on.

What causes the P116B code in a 2015 Chevrolet Silverado?

Causes may include a faulty NOx sensor, damaged wiring, corroded sensor connectors, or an issue with the vehicleâ€™s powertrain control module (PCM).

Can I drive my 2015 Chevrolet Silverado with code P116B?

Driving with P116B is possible but not recommended, as it can lead to increased emissions and potential long-term engine damage if the underlying issue isnâ€™t resolved.

How do I diagnose code P116B in a 2015 Chevrolet Silverado?

Use an OBDII scanner to verify the code, inspect the NOx sensor wiring and connectors for damage, and test the sensorâ€™s voltage output to confirm functionality.

What repairs can fix code P116B in a 2015 Chevrolet Silverado?

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

How much does it cost to fix code P116B in a 2015 Chevrolet Silverado?

Repair costs can vary, but replacing a NOx sensor typically ranges from $300 to $600, depending on parts and labor.

Can a dirty or clogged NOx sensor trigger code P116B?

Yes, a dirty or malfunctioning NOx sensor may produce incorrect voltage signals, leading to the P116B code.

Will code P116B affect my 2015 Chevrolet Silveradoâ€™s emissions test?

Yes, this code can result in increased nitrogen oxide emissions, which may cause the vehicle to fail an emissions test.

How can I prevent code P116B from occurring in my 2015 Chevrolet Silverado?

Regular maintenance, including inspecting sensors and wiring for damage, and using high-quality fuel to reduce sensor contamination, can help prevent this code.