AutoCodes – Chevrolet – P116B Chevrolet

P116B Chevrolet 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 Chevrolet 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 585

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P116B Chevrolet 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 Chevrolet - O2 Signal Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P116B Chevrolet Code - O2 Signal Circuit Low Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P116B Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

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Information for Specific Chevrolet Models

P116B 2014 Chevrolet Silverado — O2 Signal Circuit Low Voltage (NOx Sensor 1)
P116B 2015 Chevrolet Silverado — O2 Signal Circuit Low Voltage (NOx Sensor 1)
P116B 2016 Chevrolet Silverado — O2 Signal Circuit Low Voltage (NOx Sensor 1)
P116B 2017 Chevrolet Silverado — O2 Signal Circuit Low Voltage (NOx Sensor 1)
P116B 2018 Chevrolet Silverado — O2 Signal Circuit Low Voltage (NOx Sensor 1)

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 Chevrolet Code

1. What are the common symptoms of OBDII code P116B in a Chevrolet indicating O2 Signal Circuit Low Voltage (NOx Sensor 1)?

- Common symptoms may include poor engine performance, reduced fuel efficiency, rough idling, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P116B in a Chevrolet related to the O2 Signal Circuit Low Voltage (NOx Sensor 1)?

- Potential causes may include a faulty NOx sensor, damaged wiring or connectors in the O2 signal circuit, or issues with the engine control module (ECM).

3. How can I diagnose the O2 Signal Circuit Low Voltage issue causing OBDII code P116B in my Chevrolet?

- Diagnosing the problem involves using an OBDII scanner to retrieve the specific code, checking the NOx sensor and related wiring for damage, and testing the sensor's voltage readings.

4. Can a dirty or contaminated NOx sensor cause the O2 Signal Circuit Low Voltage fault code P116B in a Chevrolet?

- Yes, a dirty or contaminated NOx sensor can lead to inaccurate readings and trigger the O2 Signal Circuit Low Voltage fault code P116B.

5. What are some repair tips for addressing OBDII code P116B in a Chevrolet with the O2 Signal Circuit Low Voltage issue?

- Repair tips may include cleaning or replacing the NOx sensor, repairing or replacing damaged wiring or connectors, and resetting the fault code with an OBDII scanner.

6. Is it safe to continue driving my Chevrolet with the OBDII code P116B indicating O2 Signal Circuit Low Voltage (NOx Sensor 1)?

- It is recommended to address the issue promptly to prevent potential damage to the engine or emissions system. Continued driving with the fault code illuminated may lead to further problems.

7. How critical is it to fix the O2 Signal Circuit Low Voltage fault code P116B in a Chevrolet?

- While the vehicle may still be driveable with the code present, it is important to address the issue to ensure optimal engine performance, fuel efficiency, and emissions compliance.

8. Can a DIY enthusiast repair the O2 Signal Circuit Low Voltage issue causing OBDII code P116B in a Chevrolet?

- Depending on the individual's automotive repair skills and tools available, some DIY enthusiasts may be able to address the problem by following diagnostic procedures and making necessary repairs.

9. How much does it typically cost to repair the O2 Signal Circuit Low Voltage fault code P116B in a Chevrolet at a professional auto repair shop?

- Repair costs can vary depending on the exact cause of the issue, but it may involve parts replacement, labor fees, and diagnostic charges, which could range from a few hundred to over a thousand dollars.

10. Are there any recalls or technical service bulletins related to the OBDII code P116B and the O2 Signal Circuit Low Voltage issue in Chevrolet vehicles?

- It is advisable to check with Chevrolet dealerships or online resources for any related recalls or technical service bulletins that may provide guidance or assistance in addressing the specific fault code.