AutoCodes – GMC – P116F 2018 GMC Sierra

P116F 2018 GMC Sierra Code - O2 Pump Current Control Circuit High 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: P116F 2018 GMC Sierra indicates O2 Pump Current Control Circuit High 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 158

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
Comments
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Code P116F 2018 GMC Sierra 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 P116F 2018 GMC Sierra - O2 Pump Current Control Circuit High Voltage (NOx Sensor 1) - AutoCodes.com — P116F 2018 GMC Sierra Code - O2 Pump Current Control Circuit High Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P116F 2018 GMC Sierra?

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 P116F 2018 GMC Sierra?

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 P116F 2018 GMC Sierra 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 P116F 2018 GMC Sierra code?

Need more information on how to fix the P116F 2018 GMC Sierra 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 P116F 2018 GMC Sierra Code

1. What does the OBDII code P116F mean on a 2018 GMC Sierra?

The OBDII code P116F indicates an issue with the O2 pump current control circuit, specifically high voltage in the NOx Sensor 1, which monitors emissions and helps manage the air-fuel mixture.

2. What are the common symptoms of the P116F code on a 2018 GMC Sierra?

Symptoms may include the check engine light turning on, reduced fuel efficiency, poor engine performance, rough idling, and potential limp mode activation.

3. What causes the P116F code to appear on a 2018 GMC Sierra?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the O2 pump control circuit, a malfunctioning control module, or excessive exhaust contamination.

4. Can I drive my 2018 GMC Sierra with the P116F code?

While the vehicle may remain drivable, itâ€™s not recommended to ignore the code as it can lead to increased emissions, potential engine damage, and reduced performance over time.

5. How do I diagnose the P116F code on a 2018 GMC Sierra?

Diagnosis involves scanning the vehicle with an OBDII scanner, inspecting the NOx sensor and its wiring for damage, testing the sensorâ€™s electrical connections, and checking the exhaust system for contamination or leaks.

6. How do I fix the P116F code on a 2018 GMC Sierra?

Repairs may include replacing the faulty NOx sensor, repairing or replacing damaged wiring or connectors, cleaning or replacing the exhaust components, or updating the engine control moduleâ€™s software.

7. What is the role of NOx Sensor 1 in a 2018 GMC Sierra?

NOx Sensor 1 measures nitrogen oxide levels in the exhaust to help the engine control module adjust the air-fuel mixture and reduce emissions.

8. How much does it cost to fix the P116F code on a 2018 GMC Sierra?

Repair costs can vary, but replacing a NOx sensor typically ranges from $300 to $700, depending on parts and labor. Additional wiring repairs may increase costs.

9. Can a bad NOx sensor damage my 2018 GMC Sierraâ€™s engine?

While a faulty NOx sensor itself wonâ€™t directly damage the engine, prolonged issues with emissions control can lead to engine inefficiencies and potential long-term damage.

10. Will clearing the P116F code solve the problem on my 2018 GMC Sierra?

Simply clearing the code wonâ€™t fix the underlying issue. Proper diagnosis and repair are necessary to prevent the code from returning.