AutoCodes – GMC – P116B GMC

P116B GMC 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 GMC 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 422

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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

What does this mean?

What are the Possible Causes of the DTC P116B GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

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Information for Specific GMC Models

P116B 2014 GMC Sierra — O2 Signal Circuit Low Voltage (NOx Sensor 1)
P116B 2015 GMC Sierra — O2 Signal Circuit Low Voltage (NOx Sensor 1)
P116B 2016 GMC Sierra — O2 Signal Circuit Low Voltage (NOx Sensor 1)
P116B 2017 GMC Sierra — O2 Signal Circuit Low Voltage (NOx Sensor 1)
P116B 2018 GMC Sierra — 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 GMC Code

1. What are the common symptoms of OBDII code P116B GMC related to the O2 Signal Circuit Low Voltage (NOx Sensor 1)?

- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and possible stalling.

2. What are the typical causes of OBDII code P116B GMC indicating O2 Signal Circuit Low Voltage (NOx Sensor 1)?

- The code can be triggered by issues such as a faulty NOx sensor, damaged wiring or connectors, a failing PCM, or a malfunctioning O2 sensor.

3. How can I diagnose the O2 Signal Circuit Low Voltage issue associated with OBDII code P116B GMC?

- Diagnosis typically involves checking the NOx sensor for proper operation, inspecting wiring for damage or corrosion, and assessing the connections and the PCM for any faults.

4. Can a dirty or contaminated NOx sensor cause O2 Signal Circuit Low Voltage and trigger code P116B GMC?

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

5. What are some repair tips for resolving O2 Signal Circuit Low Voltage with code P116B GMC?

- Repair options may include cleaning or replacing the NOx sensor, repairing damaged wiring, cleaning connectors, or resetting the PCM to clear the code.

6. Is it safe to continue driving with OBDII code P116B GMC related to O2 Signal Circuit Low Voltage (NOx Sensor 1)?

- It is not recommended to drive with this code active, as it can lead to further engine problems and potential emissions issues.

7. Can a DIY enthusiast fix O2 Signal Circuit Low Voltage issue causing OBDII code P116B GMC?

- Depending on your skill level and access to tools, some repairs related to this code, such as sensor cleaning or basic wiring checks, may be possible for a DIY enthusiast.

8. How important is it to address O2 Signal Circuit Low Voltage with code P116B GMC promptly?

- It is crucial to address this issue promptly to ensure optimal engine performance, fuel efficiency, and compliance with emission regulations.

9. Are there any recalls or service bulletins related to OBDII code P116B GMC and the O2 Signal Circuit Low Voltage issue?

- It is advisable to check with the manufacturer or a certified dealership for any relevant recalls or service bulletins that may pertain to this specific problem.

10. What is the typical cost of repairing O2 Signal Circuit Low Voltage causing OBDII code P116B GMC?

- The cost of repair can vary depending on the specific issue, but it may involve expenses for parts, labor, and diagnostic services, ranging from a few hundred to over a thousand dollars.