AutoCodes – GMC – P116D GMC

P116D GMC Code - O2 Pump Current Control Circuit (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: P116D GMC indicates O2 Pump Current Control Circuit (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 1,234

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 P116D 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 P116D GMC - O2 Pump Current Control Circuit (NOx Sensor 1) - AutoCodes.com — P116D GMC Code - O2 Pump Current Control Circuit (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P116D 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 P116D 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 P116D 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 P116D GMC code?

Need more information on how to fix the P116D GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P116D 2014 GMC Sierra — O2 Pump Current Control Circuit (NOx Sensor 1)
P116D 2015 GMC Sierra — O2 Pump Current Control Circuit (NOx Sensor 1)
P116D 2016 GMC Sierra — O2 Pump Current Control Circuit (NOx Sensor 1)
P116D 2017 GMC Sierra — O2 Pump Current Control Circuit (NOx Sensor 1)
P116D 2018 GMC Sierra — O2 Pump Current Control Circuit (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 P116D GMC Code

1. What are common symptoms of OBDII code P116D in a GMC vehicle?

- Common symptoms include poor engine performance, reduced fuel efficiency, rough idling, and potential illumination of the Check Engine Light.

2. What does the OBDII code P116D GMC mean?

- The code P116D indicates an issue with the O2 Pump Current Control Circuit related to the NOx Sensor 1 in a GMC vehicle.

3. What are possible causes of the P116D OBDII code in a GMC vehicle?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors in the O2 pump circuit, issues with the O2 pump itself, or a malfunctioning electronic control unit (ECU).

4. Can a DIYer repair the P116D OBDII code in a GMC vehicle?

- Repairing the P116D code may require advanced diagnostic tools and knowledge, so it is recommended to consult a professional mechanic for proper diagnosis and repair.

5. How can I diagnose the O2 Pump Current Control Circuit issue related to the NOx Sensor 1 in my GMC vehicle?

- Diagnosing the issue involves using an OBDII scanner to retrieve the specific fault code, testing the NOx sensor and O2 pump circuit for continuity, and inspecting wiring and connectors for damage.

6. Is it safe to continue driving with the P116D code illuminated in a GMC vehicle?

- It is not recommended to continue driving with the P116D code present, as it can lead to further damage to the engine or emissions system. Prompt diagnosis and repair are advised.

7. How much does it typically cost to repair the P116D code in a GMC vehicle?

- Repair costs can vary depending on the specific issue causing the code, but expect to pay anywhere from $200 to $800 for parts and labor, including diagnostic fees.

8. Are there any preventative maintenance tips to avoid the P116D OBDII code in a GMC vehicle?

- Regularly inspecting and maintaining the emissions system components, such as the NOx sensor and O2 pump, can help prevent issues that may trigger the P116D code.

9. Can a malfunctioning NOx sensor cause the P116D OBDII code in a GMC vehicle?

- Yes, a malfunctioning NOx sensor, especially NOx Sensor 1, can be a common cause of the P116D code due to its role in monitoring and controlling emissions.

10. How long does it typically take to repair the O2 Pump Current Control Circuit issue in a GMC vehicle?

- The repair time can vary based on the exact cause of the issue and the availability of parts, but most repairs related to the P116D code can be completed within a few hours to a day at a repair shop.